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                            ## 箭頭函數

### 基本用法

ES6 允許使用“箭頭”（`=>`）定義函數。

~~~javascript
var f = v => v;

// 等同于
var f = function (v) {
  return v;
};

~~~

如果箭頭函數不需要參數或需要多個參數，就使用一個圓括號代表參數部分。

~~~javascript
var f = () => 5;
// 等同于
var f = function () { return 5 };

var sum = (num1, num2) => num1 + num2;
// 等同于
var sum = function(num1, num2) {
  return num1 + num2;
};
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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