Answer1215

摘要： const obj = { a: 1, b: 2, c: { d: 1, e: 2, }, }; function isObject(val) { return val !== null && typeof val "object"; } function observe(obj) { const 阅读全文

摘要： const obj = { a: 1, b: 2, c: { a: 1, b: 2, }, }; function isObject(val) { return val !== null && typeof val "object"; } function observe(obj) { for (l 阅读全文

摘要： As we know we can read property value from an object as so: const obj = {} obj.xxxx; obj[xxxx]; So what's the difference between those two? obj.x ECMA 阅读全文

摘要： Function.prototype.myBind = function (ctx, ...args) { const fn = this; return function (...subArgs) { console.log(new.target); const allArgs = [...arg 阅读全文

摘要： The new.target meta-property lets you detect whether a function or constructor was called using the new operator. In constructors and functions invoke 阅读全文

摘要： <template> <div> count: {{ count }} </div> <div> doubled: {{ doubledCount }} </div> <button @click="increase">increase</button> </template> <script se 阅读全文

摘要： how to encapsulate second time of ui components For example we have follow code, with one UI component MyInput // App.vue <template> <div> <MyInput></ 阅读全文

摘要： Eliminate the ambiguity of the function What ambiguity means? Normally a function can do two things 1. Instruction sequence 2. Contruction function a( 阅读全文

摘要： async function asy1() { console.log(1) await asy2() console.log(2) } asy2 = async () => { // First set // await setTimeout((_) => { // Promise.resolve 阅读全文

摘要： We often see circular dependency, why it's a problem, why we should avoid it and hwo to avoid it? Let's see any example first // main.js import A from 阅读全文