//把1,2,3分别赋值给a,b,c
        var [a,b,c]=[1,2,3];
        console.log(a+‘ | ‘+b+‘ | ‘+c);//1 | 2 | 3

//把1,2,3分别赋值给a,b,c
        var [a,[b,c]]=[1,[2,3]];
        console.log(a+‘ | ‘+b+‘ | ‘+c);//1 | 2 | 3

//把1赋值给a,3赋值给c
        var [a,,c]=[1,2,3];
        console.log(a+‘ | ‘+c);  //1 | 3

//把1赋值给a;2,3赋值给b
        var [a,...b]=[1,2,3];
        console.log(a+‘ | ‘+b);//1 | 2,3

//给c和d设置默认值为default
        var [a,b,c=‘default‘,d=‘default‘]=[1,2,3];
        console.log(a+‘ | ‘+b+‘ | ‘+c+‘ | ‘+d);//1 | 2 | 3 | default

//给c和d设置默认值为default
        var [a,b,c]=[1,2];
        console.log(a+‘ | ‘+b+‘ | ‘+c);//1 | 2 | undefined

let obj={
            a:1,
            b:2
        }
        let {a,b}=obj;
        console.log(a+" | "+b);//1 | 2

let obj={
            a:1,
            b:2
        }
        let {a:A,b}=obj;
        console.log(A+" | "+b);//1 | 2
        console.log(a);//Uncaught ReferenceError: a is not defined

let obj={
            a:1,
            b:2
        }
        let a;//a已经定义了，后面再定义就会报错
        let {a,b}=obj;//Uncaught SyntaxError: Identifier ‘a‘ has already been declared
        console.log(a+" | "+b);

{a,b}=obj;//Uncaught SyntaxError: Unexpected token =

let obj={
            a:1,
            b:2
        }
        let a=0;//a已经定义
        console.log(a);
        ({a,b}=obj);//用小括号括起来告诉js解析器这是条语句
        console.log(a+" | "+b);//1 | 2

let obj={
            arr:[
                ‘lxy‘,
                {
                    a:1
                }
            ]
        }
        //复杂解构
        let {arr:[name,{a}]}=obj;

        console.log(name+" | "+a);//lxy | 1

let {a=1,b=2}={a:10};
        console.log(a+" | "+b);//10 | 2

let {a:A=1,b=2}={a:10};
        console.log(A+" | "+b);//10 | 2

 //假设res为一个请求返回的结果
        let res={
            status:200,
            id:12,
            data:[{name:‘Bob‘},{name:‘Shuang Dan‘}]
        }

        //es6一行搞定
        let {status,id,data}=res;
        //es5
        var status=res.status;
        var id=res.id;
        var data=res.data;

let {floor,pow}=Math;//把Math里的方法提取出来变成一个变量
        let a=1.1;
        console.log(floor(a));//1
        console.log(pow(2,3));//8

var {length}=‘lxy‘;
        console.log(length);//3

var [a,b,c]=‘lxy‘;
        console.log(a+"|"+b+"|"+c);//l|x|y

//数组形式
 var arr=[1,2];
        function fun([a,b]){
            console.log("a:"+a);
            console.log("b:"+b);
        }
        fun(arr);
        //a:1
        //b:2

//解构对象
var obj={a:1,b:2};
        function fun({a,b}){
            console.log("a:"+a);
            console.log("b:"+b);
        }
        fun(obj);
        //a:1
        //b:2

var obj={b:2};
        function fun({a=10,b}){
            //a=a||10; //es5默认值写法
            console.log("a:"+a);
            console.log("b:"+b);
        }
        fun(obj);
        //a:10
        //b:2