ES6新特性箭头函数

11

function foo(){
    console.log('hello');
}
foo();

let foo1 = () => console.log('hello');
foo1();

function foo2(v){
    return v;
}
let foo2 = v => v;

// 多个参数必须用()
let foo3 = (a, b) => {let c = 1; console.log(a + b + c);}