How to use createHydrationFunctions method in Playwright Internal

Best JavaScript code snippet using playwright-internal

runtime-dom.global.js

Source:runtime-dom.global.js Github

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...4557 // But we have to place it in core due to tight coupling with core - splitting4558 // it out creates a ton of unnecessary complexity.4559 // Hydration also depends on some renderer internal logic which needs to be4560 // passed in via arguments.4561 function createHydrationFunctions(rendererInternals) {4562 const { mt: mountComponent, p: patch, o: { patchProp, nextSibling, parentNode, remove, insert, createComment } } = rendererInternals;4563 const hydrate = (vnode, container) => {4564 if ( !container.hasChildNodes()) {4565 warn(`Attempting to hydrate existing markup but container is empty. ` +4566 `Performing full mount instead.`);4567 patch(null, vnode, container);4568 return;4569 }4570 hasMismatch = false;4571 hydrateNode(container.firstChild, vnode, null, null);4572 flushPostFlushCbs();4573 if (hasMismatch && !false) {4574 // this error should show up in production4575 console.error(`Hydration completed but contains mismatches.`); ...

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runtime-core.cjs.js

Source:runtime-core.cjs.js Github

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...2289// But we have to place it in core due to tight coupling with core - splitting2290// it out creates a ton of unnecessary complexity.2291// Hydration also depends on some renderer internal logic which needs to be2292// passed in via arguments.2293function createHydrationFunctions(rendererInternals) {2294 const { mt: mountComponent, p: patch, o: { patchProp, nextSibling, parentNode, remove, insert, createComment } } = rendererInternals;2295 const hydrate = (vnode, container) => {2296 if ( !container.hasChildNodes()) {2297 warn(`Attempting to hydrate existing markup but container is empty. ` +2298 `Performing full mount instead.`);2299 patch(null, vnode, container);2300 return;2301 }2302 hasMismatch = false;2303 hydrateNode(container.firstChild, vnode, null, null);2304 flushPostFlushCbs();2305 if (hasMismatch && !false) {2306 // this error should show up in production2307 console.error(`Hydration completed but contains mismatches.`); ...

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vendor.93f284d9.js

Source:vendor.93f284d9.js Github

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...2309}2310let hasMismatch = false;2311const isSVGContainer = (container) => /svg/.test(container.namespaceURI) && container.tagName !== "foreignObject";2312const isComment = (node) => node.nodeType === 8;2313function createHydrationFunctions(rendererInternals) {2314 const {mt: mountComponent, p: patch, o: {patchProp: patchProp2, nextSibling, parentNode, remove: remove2, insert, createComment}} = rendererInternals;2315 const hydrate = (vnode, container) => {2316 hasMismatch = false;2317 hydrateNode(container.firstChild, vnode, null, null, null);2318 flushPostFlushCbs();2319 if (hasMismatch && true) {2320 console.error(`Hydration completed but contains mismatches.`);2321 }2322 };2323 const hydrateNode = (node, vnode, parentComponent, parentSuspense, slotScopeIds, optimized = false) => {2324 const isFragmentStart = isComment(node) && node.data === "[";2325 const onMismatch = () => handleMismatch(node, vnode, parentComponent, parentSuspense, slotScopeIds, isFragmentStart);2326 const {type, ref: ref2, shapeFlag} = vnode;2327 const domType = node.nodeType;...

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vendor.01f25a3a.js

Source:vendor.01f25a3a.js Github

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...2262}2263let hasMismatch = false;2264const isSVGContainer = (container) => /svg/.test(container.namespaceURI) && container.tagName !== "foreignObject";2265const isComment = (node) => node.nodeType === 8;2266function createHydrationFunctions(rendererInternals) {2267 const {mt: mountComponent, p: patch, o: {patchProp: patchProp2, nextSibling, parentNode, remove: remove2, insert, createComment}} = rendererInternals;2268 const hydrate = (vnode, container) => {2269 hasMismatch = false;2270 hydrateNode(container.firstChild, vnode, null, null);2271 flushPostFlushCbs();2272 if (hasMismatch && true) {2273 console.error(`Hydration completed but contains mismatches.`);2274 }2275 };2276 const hydrateNode = (node, vnode, parentComponent, parentSuspense, optimized = false) => {2277 const isFragmentStart = isComment(node) && node.data === "[";2278 const onMismatch = () => handleMismatch(node, vnode, parentComponent, parentSuspense, isFragmentStart);2279 const {type, ref: ref2, shapeFlag} = vnode;2280 const domType = node.nodeType;...

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vendor.6ab5482a.js

Source:vendor.6ab5482a.js Github

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...2469}2470let hasMismatch = false;2471const isSVGContainer = (container) => /svg/.test(container.namespaceURI) && container.tagName !== "foreignObject";2472const isComment = (node) => node.nodeType === 8;2473function createHydrationFunctions(rendererInternals) {2474 const { mt: mountComponent, p: patch, o: { patchProp: patchProp2, nextSibling, parentNode, remove: remove2, insert, createComment } } = rendererInternals;2475 const hydrate = (vnode, container) => {2476 if (!container.hasChildNodes()) {2477 patch(null, vnode, container);2478 flushPostFlushCbs();2479 return;2480 }2481 hasMismatch = false;2482 hydrateNode(container.firstChild, vnode, null, null, null);2483 flushPostFlushCbs();2484 if (hasMismatch && true) {2485 console.error(`Hydration completed but contains mismatches.`);2486 }2487 };...

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vendor.f4b2f46f.js

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...1969}1970let hasMismatch = false;1971const isSVGContainer = (container) => /svg/.test(container.namespaceURI) && container.tagName !== "foreignObject";1972const isComment = (node) => node.nodeType === 8;1973function createHydrationFunctions(rendererInternals) {1974 const {mt: mountComponent, p: patch, o: {patchProp: patchProp2, nextSibling, parentNode, remove: remove2, insert, createComment}} = rendererInternals;1975 const hydrate = (vnode, container) => {1976 hasMismatch = false;1977 hydrateNode(container.firstChild, vnode, null, null);1978 flushPostFlushCbs();1979 if (hasMismatch && true) {1980 console.error(`Hydration completed but contains mismatches.`);1981 }1982 };1983 const hydrateNode = (node, vnode, parentComponent, parentSuspense, optimized = false) => {1984 const isFragmentStart = isComment(node) && node.data === "[";1985 const onMismatch = () => handleMismatch(node, vnode, parentComponent, parentSuspense, isFragmentStart);1986 const {type, ref: ref2, shapeFlag} = vnode;1987 const domType = node.nodeType;...

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runtime-core.cjs.prod.js

Source:runtime-core.cjs.prod.js Github

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...1807// But we have to place it in core due to tight coupling with core - splitting1808// it out creates a ton of unnecessary complexity.1809// Hydration also depends on some renderer internal logic which needs to be1810// passed in via arguments.1811function createHydrationFunctions(rendererInternals) {1812 const { mt: mountComponent, p: patch, o: { patchProp, nextSibling, parentNode, remove, insert, createComment } } = rendererInternals;1813 const hydrate = (vnode, container) => {1814 hasMismatch = false;1815 hydrateNode(container.firstChild, vnode, null, null);1816 flushPostFlushCbs();1817 if (hasMismatch && !false) {1818 // this error should show up in production1819 console.error(`Hydration completed but contains mismatches.`);1820 }1821 };1822 const hydrateNode = (node, vnode, parentComponent, parentSuspense, optimized = false) => {1823 const isFragmentStart = isComment(node) && node.data === '[';1824 const onMismatch = () => handleMismtach(node, vnode, parentComponent, parentSuspense, isFragmentStart);1825 const { type, shapeFlag } = vnode; ...

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summary.js

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1*************2| interview |3*************4******************************************************************************5 html、css的个人见解6 不看代码 光看页面的话 css无法区分水平高低7 同样的效果可以用很多方式实现出来，8 怎么用最少的代码实现 就体现了个人水平9 充分利用 继承、默认属性、伪元素10 js11 最快的写法要根据使用场景来定12 vue的源码 根据双向绑定的源码 可以知道可以通过冻结对象优化大对象渲染页面， 前提是不需要双向绑定13******************************************************************************14 足够牛之后15 跟任何人联调 有错误 能定位到其他人的错误原因 不仅是自己知识范围内的16 头脑灵活17 一个任务来了 该让谁管理项目 谁参与 不能乱分 比如不给项目经理管理权限。。。18******************************************************************************19 大前端 FULL-STACK DEVELOPMENT 全栈开发20 1.理论上 fe be db21 2.真正能够支撑业务的full-stack架构，至少分为四层。22 第一层，是核心业务逻辑，前、后端功能、API、数据23 第二层，是业务架构，具体包括应用框架、技术架构、数据库等24 第三层：是业务运维，包括日志、监控告警、扩展性、负载均衡等25 第四层：是底层架构，包括计算资源、系统及网络安全、灾备等26******************************************************************************27 javascript28 1、Scope 作用域29 在js中可以理解为程序执行的当前环境，又称为上下文。 The current context of execution.30 作用域有层级的概念，子作用域可以访问父作用域，反之则不行。 Scopes can also be layered in a hierarchy31 2、closure 闭包32 函数及函数对其周围状态 (the lexical environment 词法环境) 的引用 (变量、子函数等函数内的代码块) 就称为闭包.33 函数创建时就创建了闭包。34 闭包使您可以从内部函数访问外部函数的作用域。35 词法（lexical）一词指的是，词法作用域根据源代码中声明变量的位置来确定该变量在何处可用。36 * 闭包的主要表现 就是内部函数维持了一个对它的词法环境（外部函数的某个变量）的引用。37 * 这个例子中的name 每次调用 myFunc 都会累加一次38 * function makeFunc() {39 * var name = 10;40 * function displayName() {41 * console.log(name++);42 * }43 * displayName()44 * return displayName;45 * }46 *47 * var myFunc = makeFunc();48 * myFunc(); // 1049 * myFunc(); // 1150 * ...51 ******************************************************************************52 function makeAdder(x) {53 return function(y) {54 return x + y;55 };56 }57 var add5 = makeAdder(5);58 var add10 = makeAdder(10);59 console.log(add5(2)); // 760 console.log(add10(2)); // 1261 从本质上讲，makeAdder 是一个函数工厂 — 他创建了将指定的值和它的参数相加求和的函数。62 add5 和 add10 都是闭包。它们共享相同的函数定义，但是保存了不同的词法环境。在 add5 的63 环境中，x 为 5。而在add10 中，x 则为 10。64 ******************************************************************************65 实现面向对象66 function makeSizer(size) {67 return function() {68 document.body.style.fontSize = size + 'px';69 };70 }71 var size12 = makeSizer(12);72 var size14 = makeSizer(14);73 ******************************************************************************74 模拟私有方法，私有方法不仅仅有利于限制对代码的访问：还提供了管理全局命名空间的强大能75 力，避免非核心的方法弄乱了代码的公共接口部分。76 这样使用闭包可以提交许多与面向对象编程相关的好处 (特别是数据隐藏和封装.)77 var Counter = (function() {78 var privateCounter = 0;79 function changeBy(val) {80 privateCounter += val;81 }82 return {83 increment: function() {84 changeBy(1);85 },86 decrement: function() {87 changeBy(-1);88 },89 value: function() {90 return privateCounter;91 }92 }93 })();94 // privateCounter 相当于私有变量95 // changeBy 相当于私有方法96 console.log(Counter.value()); /* 0 */97 Counter.increment();98 Counter.increment();99 console.log(Counter.value()); /* 2 */100 Counter.decrement();101 console.log(Counter.value()); /* 1 */102 ******************************************************************************103 3、事件循环104 JS的代码执行是基于一种事件循环的机制，所以称作事件循环。105 程序运行时，同步任务进入主线程，即主执行栈，异步任务进入任务队列。主线程内的任务(宏任务) 执行完毕 (每个宏任务结束后,106 都要清空所有的微任务)，会去任务队列读取其中的任务，推入主线程执行，上述过程不断重复就是我们说的 EventLoop (事件循107 环) 每一次循环操作称为一次tick.108 **************************************************************************************************109 macro task 宏任务：110 script( 整体代码)、setTimeout、setInterval、I/O、UI 交互事件、setImmediate(Node.js 环境)、 postMessage111 * node.js里面setTimeout(fn, 0)会被强制改为setTimeout(fn, 1) *112 * HTML5 里面setTimeout最小的时间限制是4ms *113 micro task 微任务：114 Promise、 MutaionObserver、 process.nextTick(Node.js 环境)、 Object.observe115 * node环境中(依赖libuv引擎) process.nextTick会优先其他微任务先执行 *116 * MutaionObserver与事件有本质的不同：117 * 事件是同步触发，也就是说DOM发生变动立刻会触发相应的事件；118 * MutaionObserver是异步触发，DOM发生变动以后，并不会马上触发，而是要等到当前所有DOM操作都结束后才触发。119 * 优质文章： https://juejin.cn/post/6844904100195205133120 **************************************************************************************************121 1、最好的js循环动画写法122 function render (argument) {123 动画处理代码124 }125 (function animloop() {126 render();127 window.requestAnimationFrame(animloop);128 })();129 2、Mutation Observer 是在DOM4中定义的，用于替代 mutation events 的新API，它的不同于events的是，所有130 监听操作以及相应处理都是在其他脚本执行完成之后异步执行的，并且是所有变动触发之后，将变动记录在数组中，131 统一进行回调的，也就是说，当你使用observer监听多个DOM变化时，并且这若干个DOM发生了变化，那么observer132 会将变化记录到变化数组中，等待所有变化都结束了，一次性的从变化数组中执行其对应的回调函数。133 * Mutation events 是在 DOM3中定义，用于监听DOM树结构变化的事件134 *135 * 1、浏览器兼容性问题136 * IE9不支持Mutation Events; Webkit内核不支持DOMAttrModified特性;137 * DOMElementNameChanged和DOMAttributeNameChanged 在Firefox上不被支持。138 * 2、性能问题139 * a.Mutation Events是同步执行的，它的每次调用，都需要从事件队列中取出事件，执行，然后事件队140 * 列中移除，期间需要移动队列元素。如果事件触发的较为频繁的话，每一次都需要执行上面的这些步骤，141 * 那么浏览器会被拖慢。142 * b.Mutation Events本身是事件，所以捕获是采用的是事件冒泡的形式，如果冒泡捕获期间又触发了其143 * 他的MutationEvents的话，很有可能就会导致阻塞Javascript线程，甚至导致浏览器崩溃。144 ************************************************************************************************145 浏览器和Nodejs的Event Loop：146 * JS所谓的“单线程”只是指主线程只有一个，并不是整个运行环境都是单线程147 * JS的异步靠底层的多线程实现148 * 不同的异步API对应不同的实现线程149 * 异步线程与主线程通讯靠的是Event Loop150 * 异步线程完成任务后将其放入任务队列151 * 主线程不断轮询任务队列，拿出任务执行152 * 任务队列有宏任务队列和微任务队列的区别153 * 微任务队列的优先级更高，所有微任务处理完后才会处理宏任务154 * Promise是微任务155 * Nodejs的Event Loop跟浏览器的Event Loop不一样，他是分阶段的156 * setImmediate和setTimeout(fn, 0)哪个回调先执行，需要看他们本身在哪个阶段注册的，如果在定时器回调或157 者I/O回调里面，setImmediate肯定先执行。如果在最外层或者setImmediate回调里面，哪个先执行取决于当时机器状况。158 * process.nextTick不在Event Loop的任何阶段，他是一个特殊API，他会优于其他微任务执行159 ************************************************************************************************160 Nodejs的Event Loop分阶段161 * timers: 执行setTimeout和setInterval的回调162 * pending callbacks: 执行延迟到下一个循环迭代的 I/O 回调163 * idle, prepare: 仅系统内部使用164 * poll: 检索新的 I/O 事件;执行与 I/O 相关的回调。事实上除了其他几个阶段处理的事情，其他几乎所有的异步都在165 这个阶段处理。166 * check: setImmediate 在这里执行167 * close callbacks: 一些关闭的回调函数，如：socket.on('close', ...)168********************************************************************************************************169 DOM level 和 DOM事件 * DOM 4 已发布 *170 1、W3C DOM标准（DOM分级）先后有三个版本 标准: 1 2 3 (个人感觉level译作标准 更合适)171 2、DOM标准正式形成前，有一些被广泛应用的规则，这就是我们通常所说的DOM level 0172 1、DOM事件模型有三个：DOM level 0 定义的原始事件模型、DOM level 2 定义的事件模型、IE事件模型173 **************************************************************************************************174 原始事件模型 ，指明了应该如何为元素添加事件监听。 在该模型中，事件不会传播，即没有事件流。同时，用事175 件的返回值来表示是否阻止浏览器默认行为（返回值为false时，阻止默认行为，如a链接的跳转）。176 **************************************************************************************************177 DOM level 2 的事件模型中，定义了添加、移除事件监听的方式，还增添了事件流。178 addEventListener('click', fn, false)179 removeEventListener('click', fn, false)180 事件流（事件传播）分为三个阶段：181 事件捕获阶段: 先由文档的根节点document往事件触发对象，从外向内捕获事件对象182 目标阶段: 到达目标事件位置，触发事件本身的程序内容183 事件冒泡阶段: 再从目标事件位置往文档的根节点方向回溯，从内向外冒泡事件对象184 **************************************************************************************************185 IE事件模型 只有目标阶段和冒泡阶段186 **************************************************************************************************187 2、level 1 没有定义事件相关的内容，仅仅是定义了HTML和XML文档的底层结构；level 3 也仅仅定义了一些DOM相关的操作。188 所以这两个版本的DOM标准并不存在事件模型。189**********************************************************************************************************190 完全冻结一个对象191 1、const obj 声明这个对象192 2、Object.freeze(obj) 遍历 Object.getOwnPropertyNames(obj)深冻结193 3、Object.create(null) 或者 冻结原型链的数据(比较复杂)194 其他知识：195 1、利用Object.freeze()提升性能196 当你把一个普通的 JavaScript 对象传给 Vue 实例的 data 选项，Vue 将遍历此对象所有的属性，并使用197 Object.defineProperty 把这些属性全部转为 getter/setter，这些 getter/setter 对用户来说是不可见的，198 但是在内部它们让 Vue 追踪依赖，在属性被访问和修改时通知变化。199 但 Vue 在遇到像 Object.freeze() 这样被设置为不可配置之后的对象属性时，不会为对象加上 setter getter200 等数据劫持的方法。参考Vue源码(vue会检测对象键的prop.configurable false时 不设置双向绑定)201 2、锁定对象的方法202 Object.preventExtensions()203 no new properties or methods can be added to the project204 对象不可扩展, 即不可以新增属性或方法, 但可以修改/删除205 Object.seal()206 same as prevent extension, plus prevents existing properties and methods from being deleted207 在上面的基础上，对象属性不可删除, 但可以修改208 Object.freeze()209 same as seal, plus prevent existing properties and methods from being modified210 在上面的基础上，对象所有属性只读, 不可修改211 以上三个方法分别可用Object.isExtensible(), Object.isSealed(), Object.isFrozen()来检测，都可以设置212 configurable为false。213 function getConfigurable (o, k) {214 var prop = Object.getOwnPropertyDescriptor(o, k)215 return prop && prop.configurable216 }217******************************************************************************218 对象的属性描述符219 1、数据描述符。数据描述符是一个具有值的属性，该值可以是可写的，也可以是不可写的220 Object.defineProperty(obj, "key", {221 enumerable: false,222 configurable: false,223 writable: false,224 value: "static"225 });226 2、存取描述符。存取描述符是由 getter 函数和 setter 函数所描述的属性。227 **一个对象属性的描述符只能是其中之一；不能同时是两者。**228 function withValue(value) {229 * 高效写法，提升对象的赋值速度，有值后直接寻址，230 * 无值的时候，创建对象既要在栈内存存指针，又要在堆内存存值231 var d = withValue.d || (232 withValue.d = {233 enumerable: false,234 writable: false,235 configurable: false,236 value: null237 }238 );239 d.value = value;240 return d;241 }242 | configurable | enumerable | value | writable | get | set243 ----------------------------------------------------------------------------244 数据描述符 | 可以 | 可以 | 可以 | 可以 | 不可以 | 不可以245 ----------------------------------------------------------------------------246 存取描述符 | 可以 | 可以 | 不可以 | 不可以 | 可以 | 可以247 使用点运算符和 Object.defineProperty() 为对象的属性赋值时，数据描述符中的属性默认值是不同的248 1、o.a = 1;249 // 等同于：250 Object.defineProperty(o, "a", {251 value: 1,252 writable: true,253 configurable: true,254 enumerable: true255 });256 2、Object.defineProperty(o, "a", { value : 1 });257 // 等同于：258 Object.defineProperty(o, "a", {259 value: 1,260 writable: false,261 configurable: false,262 enumerable: false263 });264******************************************************************************265 AST(Abstract Syntax Tree)抽象语法树266 一、定义267 AST是源代码的抽象语法结构的树状表示，这种数据结构其实就是一个大的json对象。简单理解，就是把我们写的代码按照一268 定的规则转换成一种树形结构。269 二、AST的用途270 AST的作用不仅仅是用来在JavaScript引擎的编译上，我们在实际的开发过程中也是经常使用的，比如我们常用的babel插件将 ES6271 转化成ES5、使用 UglifyJS来压缩代码 、css预处理器、开发WebPack插件、Vue-cli前端自动化工具等等，这些底层原理都是基于272 AST来实现的，AST能力十分强大， 能够帮助开发者理解JavaScript这门语言的精髓。273******************************************************************************274 vue源码解读275 一、模板到真实节点的过程276 1、执行 compile()， 调用 parse() 把 template 解析成 AST(抽象语法树);277 2、optimize() 优化静态节点（标记不需要更新的内容,diff 算法会直接跳过静态节点,从而减少比较的过程,278 优化了 patch 的性能）279 3、调用 generate() 生成可执行的render函数;280 4、render函数生成Vnode对象;281 5、根据Vnode对象生成真实的Dom节点。282 二、Vue组件复用使用V-slot，其中包含了匿名插槽、具名插槽、作用域插槽283 首先，进行 initRender 初始化284 然后，进行 renderSlot 挂载285 最后，进行 template 编译286 1、// 初始化生命周期、初始化事件、初始化render函数等287 Vue.prototype._init = function(){288 ...289 vm._self = vm290 initLifecycle(vm)291 initEvents(vm)292 initRender(vm)293 callHook(vm, 'beforeCreate')294 initInjections(vm) // resolve injections before data/props295 initState(vm)296 initProvide(vm) // resolve provide after data/props297 callHook(vm, 'created')298 ...299 }300 初始化：在initRender中,$slots与 $scopedSlots 挂载到了vdom 上，并对slot中的301 children进行遍历,并组合成slots对象并返回 resolveSlots()。302 // initRender 初始化303 initRender (vm: Component) {304 ...305 vm.$slots = resolveSlots(options._renderChildren, renderContext)306 vm.$scopedSlots = emptyObject307 ...308 }309 // resolveSlots 遍历，并组合成 slots 对象并返回310 function resolveSlots (311 children: ?Array<VNode>,312 context: ?Component313 ): { [key: string]: Array<VNode> } {314 const slots = {}315 for (let i = 0, l = children.length; i < l; i++) {316 const child = children[i]317 ...318 if ((child.context === context || child.fnContext === context) &&319 data && data.slot != null320 ) {321 // 具名插槽322 const name = data.slot323 const slot = (slots[name] || (slots[name] = []))324 if (child.tag === 'template') {325 slot.push.apply(slot, child.children || [])326 } else {327 // 匿名插槽328 slot.push(child)329 }330 } else {331 (slots.default || (slots.default = [])).push(child)332 }333 ...334 return slots335 }336 }337 **************************************************************************338 2、挂载：通过步骤1 生成了slots 对象，再经过renderSlot函数，分别处理对象或函数，339 生成nodes节点340 export function renderSlot (341 // 子组件中slot的name，匿名default342 name: string,343 fallbackRender: ?((() => Array<VNode>) | Array<VNode>),344 props: ?Object,345 bindObject: ?Object346 ): ?Array<VNode> {347 ...348 const target = props && props.slot349 if (target) {350 return this.$createElement('template', { slot: target }, nodes)351 } else {352 return nodes353 }354 }355 3、 编译：将nodes 进行编译并渲染到页面356 三、Vue 逻辑的复用 mixin357 1、minxin内部的合并逻辑及相关函数的执行顺序358 入口在 'global-api/index.js' initGlobalAPI -> initMixin -> mergeOptions -> strats359 1、mergeOptions 的逻辑360 ① 优先判断有没有mixin里面挂mixin的情况 有的话递归进行合并，最终形成一层嵌套关系。361 ② 优先遍历 parent 的key, 再遍历child中的key362 ③ 调用对应的 strats[XXX]方法进行合并363 strats[key]是合并的核心逻辑364 1、data中 若没有值则重新set，若存在则进行合并，最终返回处理后的数据对象。365 2、生命周期执行逻辑是一样的, 将函数存入一个新的数组队列，并正序遍历，依次执行。366 执行顺序为：全局 mixin -> 组件 mixin的mixin -> 组件mixin -> 组件 options367 3、ASSET_TYPES中包括component、directive、filter，它们通过原型链进行叠加368 4、strats.props = strats.methods = strats.inject = strats.computed 直接替换。369 ******************************************************************************370 随着项目结构的复杂，引用大量mixin会带来一些使用缺陷，比如：隐式依赖、命名冲突、侵入式等问题。371 因此，在vue3中出现了一个更好的组合式API，使组件及逻辑复用更加清晰，可读性更优。372 vue3 与 vue2 的区别: 构造函数、响应式以及Composition Api373 1、vue2中需要 new Vue()来创建根实例并进行数据和方法的初始化；而vue3中则直接使用createApp来374 创建对象，去掉了Vue 构造函数，避免非必要功能集成，减小体积。375 2、Vue3 使用 Proxy代理 取代 Vue2的 Object.defineProperty劫持，且响应式模块拆出，可单独使376 用，即reactivity377 3、Composition Api 使得组件化 更加内聚，将零散分布的逻辑组合在一起，也可以将单独的功能逻辑拆378 分成单独的文件。在写法上更贴近于react的纯函数思想379 **************************************************************************380 Composition Api重点函数setup，setup是何时被注册的381 // 1- 初始化：通过 ensureRenderer来 创建 app 对象382 const createApp = ((...args) => {383 const app = ensureRenderer().createApp(...args)384 }385 // 2 - ensureRenderer 调用 createRenderer 渲染函数386 function ensureRenderer() {387 return renderer || (renderer = createRenderer<Node, Element>(rendererOptions))388 }389 // 3- createRenderer 调用 baseCreateRenderer390 function createRenderer(options: RendererOptions<HostNode, HostElement>) {391 return baseCreateRenderer<HostNode, HostElement>(options)392 }393 // 4- baseCreateRenderer在这个方法中将vnode进行diff和patch操作并挂载到 container 上，394 // 最终返回 render hydrate createApp三个函数395 function baseCreateRenderer(396 options: RendererOptions,397 createHydrationFns?: typeof createHydrationFunctions398 ): any { ...399 return {400 render,401 hydrate,402 createApp: createAppAPI(render, hydrate)403 }404 ...405 // 5- `patch`中出现了 processComponent 函数，继而调用了 mountComponent，进入了406 // setupComponent中,先解析属性，再解析slots，之后调用了setup函数。407 function setupComponent() {408 const propsOptions = Comp.props409 resolveProps(instance, initialVNode.props, propsOptions)410 resolveSlots(instance, initialVNode.children)411 setupStatefulComponent(instance, parentSuspense)412 }413 // 6- 最终的执行结果 handleSetupResult，如果是函数，则赋值给实例对象render，如果是对象，则创建响应式。414 export function handleSetupResult(415 instance: ComponentInternalInstance,416 setupResult: unknown,417 parentSuspense: SuspenseBoundary | null418 ) {419 if (isFunction(setupResult)) {420 instance.render = setupResult as RenderFunction421 } else if (isObject(setupResult)) {422 instance.renderContext = reactive(setupResult)423 }424 finishComponentSetup(instance, parentSuspense)425 }426 四、Vue 2.0 的更新机制(虚拟dom、diff算法)427 虚拟dom是由一个个Vnode节点组成的，核心代码位于 patch.js, 大体流程为：428 1、新的Vnode节点不存在并且老的Vnode存在，只调用销毁Vnode节点的Hook; 如果老的Vnode节点不存在，429 则直接调用新建函数生成节点。如果新老节点都存在并且通过sameVnode函数判断为true，则再进行diff操作，430 否则也直接去新建节点并替换。431 *************************************************************************432 function sameVnode (a, b) {433 return (434 a.key === b.key && (435 (436 a.tag === b.tag &&437 a.isComment === b.isComment &&438 isDef(a.data) === isDef(b.data) &&439 sameInputType(a, b)440 ) || (441 isTrue(a.isAsyncPlaceholder) &&442 a.asyncFactory === b.asyncFactory &&443 isUndef(b.asyncFactory.error)444 )445 )446 )447 }448 sameVnode主要逻辑:449 首先判断key是否一致，其次同步组件需要判断是否同为注释节点或都不是注释节点、数据信息是否存在、Input类型是否一致，450 而异步组件需要判断工厂函数是否一致。451 2、diff的核心在updateChildren函数452 五、双向绑定的实现原理453 1、Object.defineProperty - get ，用于 依赖收集454 2、Object.defineProperty - set，用于 依赖更新455 3、每个 data 声明的属性，都拥有一个的专属依赖收集器 subs (包括页面的依赖、compute、watch等)456 4、依赖收集器 subs 保存着依赖的 watcher457 5、watcher 用于 进行视图更新458 *****************************************************************************************************459 核心实现类:460 1、Observer: 它的作用是给对象的属性添加 getter 和 setter，用于依赖收集和派发更新461 2、Dep: 用于收集当前响应式对象的依赖关系,每个响应式对象包括子对象都拥有一个 Dep 实例（里面的 subs462 是 Watcher 实例数组）,当数据有变更时,会通过 dep.notify()通知各个 watcher。463 3、Watcher: 观察者对象 , 实例分为渲染 watcher (render watcher), 计算属性 watcher (computed464 watcher), 侦听器 watcher（user watcher）三种。465 *****************************************************************************************************466 六、v-model467 <input v-model="searchText"> 相当于468 <input v-bind:value="searchText" v-on:input="searchText = $event.target.value">469 *****************************************************************************************************470 自定义组件上 <custom-input v-bind:value="searchText" v-on:input="searchText = $event"></custom-input> /471 具体实现472 Vue.component('custom-input', {473 props: ['value'],474 template: `475 <input476 v-bind:value="value"477 v-on:input="$emit('input', $event.target.value)"478 >479 `480 })481 使用 <custom-input v-model="searchText"></custom-input> /482 ***************************************************************************************************483 **** 非input元素封装的自定义组件 ****484 一个组件上的 v-model 默认会利用名为 value 的 prop 和名为 input 的事件，但是像单选框、复选框等类型的输入控件485 可能会将 value attribute 用于不同的目的。model 选项可以用来避免这样的冲突：486 Vue.component('base-checkbox', {487 model: {488 prop: 'checked',489 event: 'change'490 },491 props: {492 checked: Boolean493 },494 template: `495 <input496 type="checkbox"497 v-bind:checked="checked"498 v-on:change="$emit('change', $event.target.checked)"499 >500 `501 })502 使用 <base-checkbox v-model="lovingVue"></base-checkbox> /503******************************************************************************504 vue 3.0 diff算法解读505 一、什么地方用到了diff506 1、存在children的vnode507 ① element vnode 元素类型的508 用 patchElement() 处理509 ② fragment vnode 碎片类型的510 `<Fragment>511 <span> 苹果 </span>512 <span> 香蕉 </span>513 <span> 鸭梨 </span>514 </Fragment>`515 用 processFragment() 处理516 2、patchChildren 处理 1 中的vnode, patchChildren时，发现children还有自己的children，会递归向下patch517 根据是否存在key进行真正的diff patchKeyedChildren() 或者直接patch patchUnkeyedChildren()518 二、diff算法519 在vue2 diff算法的基础上 使用 最长增长子序列算法 做了优化，大大提高了效率。以下是实现方法520 1、动态规划521 var arr = [2,3,5,10,7,20,100,0];522 let dp =[];523 for(let i=0;i<arr.length;i++){524 dp[i]=1;525 }526 let res = 0;527 for(let i=1;i<arr.length;i++){528 for(let j=0;j<i;j++){529 if(arr[j]<arr[i]){530 dp[i] = Math.max(dp[i],dp[j]+1) // dp[i]代表第i个位置上升子序列中元素的长度531 }532 }533 res = Math.max(res,dp[i])534 }535 console.log(res)536 2、最小二分法537 let arr = [1, 5, 6, 7, 8, 2, 3, 4, 9]538 let subArr = [0]539 let prevIndex=[0];540 for (let i = 1; i < arr.length; i++) {541 if (arr[i] > arr[subArr[subArr.length - 1]]) {542 prevIndex.push(subArr[subArr.length - 1])543 subArr.push(i)544 } else {// arr[i] 较小545 let u = 0;546 let c= 0;547 let v = subArr.length - 1548 // 二分搜索，查找比 arrI 小的节点，更新 result 的值549 while (u < v) {550 c = ((u + v) / 2) | 0551 if (arr[i] > arr[subArr[c]]) {552 u = c + 1553 } else {554 v = c555 }556 }557 if (arr[i] < arr[subArr[u]]) {558 prevIndex.push(subArr[u-1])559 subArr[u] = i560 }561 }562 // 利用前驱节点重新计算subArr563 let length = subArr.length; //总长度564 let prev = subArr[length - 1] // 最后一项565 while (length-- > 0) {// 根据前驱节点一个个向前查找566 subArr[length] = prev567 prev = prevIndex[subArr[length]]568 }569 }570************************************************************************************************************571 /*572 * vue2 vue3 双向绑定的原理573 *574 */575 var person = {};576 Object.defineProperties(person, {577 age: {578 defaultValue:11,579 get:function(){580 return this.defaultValue;581 },582 set:function(val){583 this.defaultValue=val;584 console.log("触发了set");585 }586 }587 })588 //修改属性的值时能够触发set589 person.age =12 //触发了set590 person.age // 12591 //将属件的值设置为一个数组，当通过索引值修改数组的某一项或使用某些方法修改数组时不能触发方法592 person.age =[2，3，4] // 触发了set593 person.age[2]=5//未触发set594 person.age // [2，3, 5] 数据已经改变595 person.age.push(5)//未触发set596 person.age // [2,3，5，5]597 //将性的值设置为一个对象，当修改对象中某属性的值时无法触发set598 person.age = { first: 1 } // 触发了set599 person.age.first = 2 //未触发set600 let obj = {};601 let handler = {602 get(target,property){603 console.log(`${property} 被读取`);604 return property in target ? target[property] :3:605 },606 set(target,property,value){607 console.log(`${property}被设置为 ${value}`);608 target[property]=value;609 return true610 }611 }612 let p = new Proxy(obj, handler);613 p.name="tom" //name 被设置为tom614 p.age;//age 被读取3615 let q = new Proxy([[1,2,3], 2],handler);616 q.length // length 被读取617 q[1] // 1被读取618 q[2] = 6 //2被设置为6619 q.push(4) //3被设置为4620 q // Proxy {0:1,1:2，2:6，3:4]621************************************************************************************************************622 面试题623 一、vm.$set()实现原理624 1、如果目标是数组,使用 vue 实现的变异方法 splice 实现响应式625 2、如果目标是对象,判断属性存在,即为响应式,直接赋值626 3、如果 target 本身就不是响应式,直接赋值627 4、如果属性不是响应式,则调用 defineReactive 方法进行响应式处理628 二、keep-alive 的实现原理和缓存策略629 1、获取 keep-alive 包裹着的第一个子组件对象及其组件名630 2、根据设定的 include/exclude（如果有）进行条件匹配,决定是否缓存。不匹配,直接返回组件实例631 3、根据组件 ID 和 tag 生成缓存 Key,并在缓存对象中查找是否已缓存过该组件实例。如果存在,直接取出缓存值并更新该632 key 在 this.keys 中的位置(更新 key 的位置是实现 LRU 置换策略的关键)633 4、在 this.cache 对象中存储该组件实例并保存 key 值,之后检查缓存的实例数量是否超过 max 的设置值,超过则根据634 LRU 置换策略删除最近最久未使用的实例（即是下标为 0 的那个 key）635 三、Vue 父子组件的生命周期顺序636 1、加载渲染过程637 父beforeCreate->父created->父beforeMount->子beforeCreate->子created->子beforeMount->子mounted->父mounted638 2、子组件更新过程639 　　 父beforeUpdate->子beforeUpdate->子updated->父updated640 3、父组件更新过程641 　　 父beforeUpdate->父updated642 4、销毁过程643 　　 父beforeDestroy->子beforeDestroy->子destroyed->父destroyed644************************************************************************************************************645 /*646 * 前端路由的两种实现原理647 */648 一、Hash模式649 重点是 hashchange 事件650 二、History 模式651 history.pushState() 或 history.replaceState()652 调用 history.pushState() 或 history.replaceState() 方法不会触发popstate事件，只有在做出浏览器动作时，才会触653 发该事件，如用户点击浏览器的回退按钮（或者在Javascript代码中调用 history.back() 或者 history.forward()方法）...

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1const { createHydrationFunctions } = require('@playwright/test');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 const { hydrate } = createHydrationFunctions(page);8 await hydrate();9 await browser.close();10})();11const { createHydrationFunctions } = require('@playwright/test');12const { chromium } = require('playwright');13(async () => {14 const browser = await chromium.launch();15 const context = await browser.newContext();16 const page = await context.newPage();17 const { hydrate } = createHydrationFunctions(page);18 await hydrate({19 before: async (page, action) => {20 console.log(action);21 },22 });23 await browser.close();24})();25{ action: 'click', selector: 'text=Get Started' }26{ action: 'click', selector: 'text=Docs' }27{ action: 'click', selector: 'text=API' }28{ action: 'click', selector: 'text=Blog' }29{ action: 'click', selector: 'text=Community' }30{ action: 'click', selector: 'text=GitHub' }31{ action: 'click', selector: 'text=Twitter' }32{ action: 'click', selector: 'text=YouTube' }33{ action: 'click', selector: 'text=LinkedIn' }34{ action: 'click', selector: 'text=Slack' }35{ action: 'click', selector: 'text=Discord' }36{ action: 'click', selector: 'text=Stack Overflow' }37{

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1const { createHydrationFunctions } = require('playwright/lib/server/frames');2const { Page } = require('playwright/lib/server/page');3const { Frame } = require('playwright/lib/server/frame');4const { ElementHandle } = require('playwright/lib/server/elementHandler');5const { JSHandle } = require('playwright/lib/server/jsHandle');6const { CDPSession } = require('playwright/lib/server/cdpsession');7const { helper } = require('playwright/lib/helper');8const { assert } = require('playwright/lib/helper');9const { debugError } = require('playwright/lib/helper');10const { debug } = require('playwright/lib/helper');11const { debugProtocol } = require('playwright/lib/helper');12const { createTestState, setupTestBrowserHooks, setupTestPageAndContextHooks, it, describe } = require('./mocha-utils');13const { itFixme } = require('./mocha-utils');14const { itFailsFirefox } = require('./mocha-utils');15const { itFailsChrome } = require('./mocha-utils');16const { itFailsWebKit } = require('./mocha-utils');17const { itFails } = require('./mocha-utils');18const { itFailsWindows } = require('./mocha-utils');19const { itFailsLinux } = require('./mocha-utils');20const { itFailsMac } = require('./mocha-utils');21const { itFailsAndroid } = require('./mocha-utils');22const { itFailsAndroidFirefox } = require('./mocha-utils');23const { itFailsAndroidWebKit } = require('./mocha-utils');24const { itFailsAndroidChrome } = require('./mocha-utils');25const { itFailsIos } = require('./mocha-utils');26const { itFailsIosWebKit } = require('./mocha-utils');27const { itFailsIosFirefox } = require('./mocha-utils');28const { itFailsIosChrome } = require('./mocha-utils');29const { itFailsIosSafari } = require('./mocha-utils');30const { itFailsIosSafari14 } = require('./mocha-utils');31const { itFailsIosSafari13 } = require('./mocha-utils');32const { itFailsIosSafari12 } = require('./mocha-utils');33const { itFailsIosSafari11 }

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1const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');2const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');3const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');4const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');5const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');6const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');7const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');8const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');9const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');10const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');11const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');12const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');13const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');14const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');15const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');

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1const { createHydrationFunctions } = require('playwright/lib/server/dom.js');2const { jsdom } = require("jsdom");3const fs = require('fs');4const path = require('path');5const html = fs.readFileSync(path.join(__dirname, 'test.html'), 'utf8');6const document = jsdom(html).defaultView.document;7const { hydrate, dehydrate } = createHydrationFunctions(document);8const el = document.getElementById('test');9const dehydrated = dehydrate(el);10const hydrated = hydrate(dehydrated);11console.log(hydrated);

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1const { createHydrationFunctions } = require('playwright/lib/server/dom.js');2const { JSDOM } = require('jsdom');3const { parse } = require('node-html-parser');4const fs = require('fs');5const html = fs.readFileSync('test.html', 'utf-8');6const dom = new JSDOM(html);7const { window } = dom;8const { document } = window;9const { hydrate } = createHydrationFunctions(window);10const html = fs.readFileSync('test.html', 'utf-8');11const root = parse(html);12hydrate(root);13 function test() {14 console.log('test() is called');15 }16 <button onclick="test()">Click me</button>

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Using AI Code Generation

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1const { createHydrationFunctions } = require('playwright/lib/internal/hydrate');2const { createPage } = require('playwright/lib/internal/page');3const { createBrowserContext } = require('playwright/lib/internal/browserContext');4const context = createBrowserContext();5const { page, frame } = createPage(context, 'about:blank', true);6const { hydrate, dehydrate } = createHydrationFunctions(page);7const { myElement } = hydrate(`8`);9const html = dehydrate(myElement);10console.log(html);11await context.close();12const pageSource = await page.evaluate(() => document.documentElement.outerHTML);13console.log(pageSource);14const pageSource = await page.content();15console.log(pageSource);16const pageSource = await page.evaluate(() => document.documentElement.outerHTML);17console.log(pageSource);18const pageSource = await page.content();19console.log(pageSource);20const pageSource = await page.evaluate(() =>

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Using AI Code Generation

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1const { createHydrationFunctions } = require('playwright/lib/server/supplements/hydrate');2const { createServer, request } = require('http');3const { parse } = require('url');4const { createReadStream } = require('fs');5const { hydrate, dehydrate } = createHydrationFunctions();6const server = createServer(async (req, res) => {7 const { pathname } = parse(req.url);8 if (pathname === '/test.html') {9 const html = await dehydrate(`<html>10 window.foo = 'bar';11 window.foo = 'baz';12 </html>`);13 res.end(html);14 } else if (pathname === '/test.js') {15 const js = await hydrate(`console.log(window.foo)`);16 res.end(js);17 } else {18 res.end('Not Found');19 }20});21server.listen(3000, () => {22 let data = '';23 res.on('data', (chunk) => data += chunk);24 res.on('end', () => {25 const dom = new JSDOM(data);26 const script = dom.window.document.createElement('script');27 dom.window.document.body.appendChild(script);28 script.addEventListener('load', () => {29 server.close();30 });31 });32 });33});

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Using AI Code Generation

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1const { createHydrationFunctions } = require('playwright/lib/server/frames');2const { Frame } = require('playwright/lib/server/frames');3const { Page } = require('playwright/lib/server/page');4const { ElementHandle } = require('playwright/lib/server/dom');5const { JSHandle } = require('playwright/lib/server/javascript');6const { serializeResult } = require('playwright/lib/server/serializers');7const { Protocol } = require('playwright/lib/protocol');8const { createPlaywright } = require('playwright');9const playwright = createPlaywright();10(async () => {11 const browser = await playwright.chromium.launch();12 const context = await browser.newContext();13 const page = await context.newPage();14 const frame = page.mainFrame();15 const elementHandle = await frame.$('form');16 const { hydrate, dehydrate } = createHydrationFunctions();17 const hydratedElementHandle = hydrate(elementHandle);18 const dehydratedElementHandle = dehydrate(hydratedElementHandle);19 console.log(dehydratedElementHandle);20 await browser.close();21})();22const { createHydrationFunctions } = require('playwright/lib/server/frames');23const { Frame } = require('playwright/lib/server/frames');24const { Page } = require('playwright/lib/server/page');25const { ElementHandle } = require('playwright/lib/server/dom');26const { JSHandle } = require('playwright/lib/server/javascript');27const { serializeResult } = require('playwright/lib/server/serializers');28const { Protocol } = require('playwright/lib/protocol');29const { createPlaywright } = require('playwright');30const playwright = createPlaywright();31(async () => {32 const browser = await playwright.chromium.launch();33 const context = await browser.newContext();34 const page = await context.newPage();35 const frame = page.mainFrame();36 const { hydrate, dehydrate } = createHydrationFunctions();37 const elementHandle = dehydrate({

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1import { createHydrationFunctions } from 'playwright/lib/server/dom.js';2const { hydrate, dehydrate } = createHydrationFunctions();3const html = `<div id="div1">Hello World</div>`;4const element = hydrate(html);5console.log(element.innerHTML);6const dehydratedHTML = dehydrate(element);7console.log(dehydratedHTML);8import { createSnapshot } from 'playwright/lib/server/dom.js';9const snapshot = createSnapshot(document);10console.log(snapshot.innerHTML);11import { createSnapshot, restoreSnapshot } from 'playwright/lib/server/dom.js';12const snapshot = createSnapshot(document);13restoreSnapshot(document, snapshot);14- [playwright](

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Playwright tutorial

LambdaTest’s Playwright tutorial will give you a broader idea about the Playwright automation framework, its unique features, and use cases with examples to exceed your understanding of Playwright testing. This tutorial will give A to Z guidance, from installing the Playwright framework to some best practices and advanced concepts.

Chapters:

  1. What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
  2. How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
  3. Playwright Futuristic Features: Launched in 2020, Playwright gained huge popularity quickly because of some obliging features such as Playwright Test Generator and Inspector, Playwright Reporter, Playwright auto-waiting mechanism and etc. Read up on those features to master Playwright testing.
  4. What is Component Testing: Component testing in Playwright is a unique feature that allows a tester to test a single component of a web application without integrating them with other elements. Learn how to perform Component testing on the Playwright automation framework.
  5. Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
  6. Functions and Selectors in Playwright: Learn how to launch the Chromium browser with Playwright. Also, gain a better understanding of some important functions like “BrowserContext,” which allows you to run multiple browser sessions, and “newPage” which interacts with a page.
  7. Handling Alerts and Dropdowns in Playwright : Playwright interact with different types of alerts and pop-ups, such as simple, confirmation, and prompt, and different types of dropdowns, such as single selector and multi-selector get your hands-on with handling alerts and dropdown in Playright testing.
  8. Playwright vs Puppeteer: Get to know about the difference between two testing frameworks and how they are different than one another, which browsers they support, and what features they provide.
  9. Run Playwright Tests on LambdaTest: Playwright testing with LambdaTest leverages test performance to the utmost. You can run multiple Playwright tests in Parallel with the LammbdaTest test cloud. Get a step-by-step guide to run your Playwright test on the LambdaTest platform.
  10. Playwright Python Tutorial: Playwright automation framework support all major languages such as Python, JavaScript, TypeScript, .NET and etc. However, there are various advantages to Python end-to-end testing with Playwright because of its versatile utility. Get the hang of Playwright python testing with this chapter.
  11. Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
  12. Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.

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