一、变量的解构赋值
1. 理解:
* 从对象或数组中提取数据, 并赋值给变量(多个)
2. 对象的解构赋值
let {n, a} = {n:'tom', a:12}
3. 数组的解构赋值
let [a,b] = [1, 'onedean'];
4. 用途
* 给多个形参赋值
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>03_变量的解构赋值</title>
</head>
<body>
<script type="text/javascript">
let obj = {
username:'onedean',
age:20
}
/*let username = obj.username
let age = obj.age*/
let {username,age} = obj
console.log(username,age) // onedean 20
let arr = [1,3,5,'abc',true]
let [a,b,c,d,e] = arr
console.log(a,b,c,d,e) // 1 3 5 "abc" true
let [,,xxx] = arr
console.log(xxx) // 5
function person(obj) { // 不用解构赋值
console.log(obj.username,obj.age) // onedean 20
}
person(obj)
function person1({username,age}) { // onedean 20 使用解构赋值，此处相当于{username,age} = obj
console.log(username,age)
}
person1(obj)
</script>
</body>
</html>