es6箭头函数

1.基础语法

(param1, param2, …, paramN) => { statements }  
(param1, param2, …, paramN) => expression  
         // equivalent to:  => { return expression; }  
  
// 如果只有一个参数，圆括号是可选的:  
(singleParam) => { statements }  
singleParam => { statements }  
  
// 无参数的函数需要使用圆括号:  
() => { statements }  
//例子1.
var f = () => 5;
// 等同于
var f = function () { return 5 };
//2.
  var abc=(a,b)=>{
        console.log(a,b);
    }

2.高级语法

// 返回对象字面量时应当用圆括号将其包起来:  
params => ({foo: bar})  
  
// 支持 Rest parameters 和 default parameters:  
(param1, param2, ...rest) => { statements }  
(param1 = defaultValue1, param2, …, paramN = defaultValueN) => { statements }  
  
// Destructuring within the parameter list is also supported  
var f = ([a, b] = [1, 2], {x: c} = {x: a + b}) => a + b + c;  
f();  // 6 

 

转载于:https://my.oschina.net/u/725790/blog/1560664