ES2015 延展操作符 + 解构

延展操作符

let showMe=(name,age)=>`${name}的年龄是${age}`
let me=['daichen',18];
alert   (showMe(me));
//此时认为me 就是 name参数


let showMe=(name,age)=>`${name}的年龄是${age}`
let me=['daichen',18];
alert   (showMe(...me));
//此时me数组里的数值一一对应传给showMe方法

...就是延展操作符.

解构

let [name,age]=[“daichen”,18];

let [name,age]=[“daichen”,]; //如果第二个没数值那么就写个 ,

左右解构相同。

延展操作符 + 解构

let showMe=(name,age)=>`${name}的年龄是${age}`
let [sex,...me]=["男","daichen",18];
alert   (showMe(...me));
alert(me.length)