把数组里面、对象数据，解析出来复制给变量的一种简洁写法

    let [a,b,c] = [1,2,3];
    console.log(a,b,c);
    let person = {name: 'zhangsan', age: 19};
    let {name, age} = person;
    console.log(name, age)

对象和数组、结束分号建议写上