变量的赋值结构

变量的解构赋值

var a = 1;
var b = 2;
var c = 3;

var a = 1,b = 2,c = 3;

数组的解构赋值

let [a,b,c] = [1,2,3];
let [a,b,c] = [,123,];
let [a=111,b,c] = [,123,];
console.log(a,b,c);

对象的解构赋值

let {foo,bar} = {foo : 'hello',bar : 'hi'};
let {foo,bar} = {bar : 'hi',foo : 'hello'};

对象属性别名(如果有了别名，那么原来的名字就无效了)

let {foo:abc,bar} = {bar : 'hi',foo : 'nihao'};
console.log(foo,bar);

对象的解构赋值指定默认值

let {foo:abc='hello',bar} = {bar : 'hi'};
console.log(abc,bar);
//换名字后原来的名字不能在用
 let {cos,sin,random} = Math;
 console.log(typeof cos);
 console.log(typeof sin);
 console.log(typeof random);

字符串的解构赋值

let [a,b,c,d,e,length] = "hello";
console.log(a,b,c,d,e);
console.log(length);

console.log("hello".length);

let {length} = "hi";
console.log(length);

赏

谢谢你请我吃糖果

本文总阅读量次