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);}
原文：https://www.cnblogs.com/ella-li/p/14587350.html