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                ### 變量聲明 ```js var a , b; // 確定:變量提前 ``` ##### ES6寫法: ```js // 不可以在定義前使用,塊級作用域 console.log(a) if (true) { let a = 1 , b = 0; } // 定義常量 const PI = 3.14 ``` ### ### 模板字符串 ```js var str = 'world'; var result = 'hello' + str; ``` ##### ES5寫法: ```js // 使用反引號 var str = 'world'; var result = `hello ${str}`; ``` ### ### 模塊 \(ES5原生不支持\) ##### ES6中: \(1\) 按需導入 ```js // 文件 config.js, 導出模塊 const A = { name: 'zk' }; const B = { name: 'wl' }; export A export B ``` ```js // main.js 用到,導入模塊 import {A} from './config.js' import {B} from './config.js' import {A,B} from './config.js' import * as type from './config.js' console.log(type.A.name) ``` (1)按需導入 ```js // 文件 config.js, 導出模塊 const A = { name: 'zk' }; const B = { name: 'wl' }; export A export default B ``` ```js // main.js 用到,導入模塊 import {A} from './config.js' import {B} from './config.js' import {A,B} from './config.js' ``` ### 箭頭函數 ```js let that =this; setTimeout(function () { alert(this) // window || undefined }, 1000) setTimeout(() => { console.log(this) // this = that }) ``` ### 對象的擴展 ```js let name = 'zk' let obj = { name, say () { console.log('hello') } } obj.name; obj.say(); ``` ### ... 擴展運算符 ```js let arrs = [1, 3, 4, 7, 5, 3] Math.max(...arrs) ``` ### Object.assgin方法 Object.assign() 方法用于把一個或多個源對象的**可枚舉屬性值**復制到目標對象中,返回值為目標對象。 ```js var obj = {a: 1}; var copy = Object.assign({}, obj); console.log(copy); // {a: 1}; ``` 常見用途: 1. 合并多個對象 2. 克隆對象(淺復制) 3. 為對象添加多個方法
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