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                const 變量不變 let 變量可變 箭頭函數,支持默認設置參數 ~~~ const fn=(a=1,b=2)=>{return a+b;} const fn1 = (a,b)=>a+b; //簡寫,當返回值可省略括號 ~~~ 字符模板,不再使用+鏈接字符串 ~~~ const a = 20; const b = 30; const string = `${a}+${b}=${a+b}`; ~~~ 解析結構 ~~~ const obj={ a:1, b:2, c:3 } const {a,b}=obj; 對象解析結構 let [a, b, c] = [1, 2, 3];數組的解析結構 let [a, ...b] = [1, 2, 3]; 剩余運算 a=1 b=[2,3] ~~~ 簡寫,當屬性和值相同 ~~~ const person = { name, age,fn(){ return this.name; } }等價 var person = { name: name, age: age , fn:function fn(){ return this.name; } }; ~~~ 類 ``` class Person { //構造方法 constructor(name, age) { this.name = name; this.age = age; } getName() { return this.name } } ``` 模塊 接口定義可以是變量,函數,類 var m=1 export {m} export default默認方法或變量 import {m} from 'm';
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