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                ## 一個參數 ``` let foo = v => v * v; console.log(foo(10)); ``` ## 多個參數 ``` let foo = (a, b) => console.log(a + b); //需要加一個括號 foo(200,200); ``` 如果使用了新的變量 ``` let foo = (a, b) => { //需要添加大括號 let c = 100; console.log(a + b + c); } foo(100, 200, 300); ``` ## 箭頭函數作為匿名函數 箭頭函數可以當做匿名函數使用. ## 箭頭函數中的this 1. 箭頭函數中的this取決于函數定義時的this,而不是調用時的this.而其他函數的this,取決于指向時的對象. 2. 箭頭函數不可以new. 3. 箭頭函數不可以使用arguments獲取參數列表,可以使用rest參數代替. ``` var arr = [1, 2, 3]; var foo = (...param) => { console.log(param); }; foo(arr); ```
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