es6结构赋值：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>es6结构赋值</title> </head> <body> <script> //es6结构赋值 let arr=["held","word","good"]; let [firstname,twoname] = arr console.log(firstname,twoname); //held word let demo = ["a","b","c","d"]; let [name1, , name3] = demo; console.log(name1,name3);//a c //属性赋值 let user = {name:"张三",old:"18"}; [user.name,user.old] = [1,2] console.log(user);//{name: 1, old: 2} </script> </body> </html>
数组结构赋值
<script>
//数组结构赋值
let arr = [ 1,2,3,4,5,6,7,8,9]
let [firstname,curname,...last] = arr
console.log(firstname,curname,last);//1 2 (7) [3, 4, 5, 6, 7, 8, 9]
</script>
对象结构赋值
<script>
//object结构赋值
let options = {
title:"menu",
100,
heigth:100
}
//左边是变量右边是赋值
let {title,width,heigth} = options;
console.log(title,width,heigth)//menu 100 100
</script>
对象结构赋值2
<script>
//object结构赋值
let options = {
title:"menu",
heigth:100
}
//默认值
let {title:title2,width=130,heigth} = options;
console.log(title2,width,heigth)//menu 130 100
</script>
对象结构赋值 3
<script>
//object结构赋值
let options = {
title:"menu",
100,
heigth:100
}
//...last
let {title,...last} = options;
console.log(title,last)//menu { 100, heigth: 100}
</script>
对象结构嵌套赋值
<script>
//object结构嵌套赋值
let options = {
size:{
100,
heigth:200
},
items:['cake','donut'],
heigth:100
}
let {size:{width}} = options;
console.log(width)//100
</script>
对象结构嵌套赋值2
<script>
//object结构嵌套赋值
let options = {
size:{
100,
heigth:200
},
items:['cake','donut'],
heigth:100
}
let {size:{kuan,heigth},items:[item1]} = options;
console.log(kuan,heigth,item1)//100 200 "cake"
</script>