js之数组对象与访问器
16lz
2021-04-04
1.数组对象
- 代码块
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script>
let object = {
name : '123',
sex : '男'
}
let arr = [1,2,3];
object.name = 321;
console.table([object]);
console.table(arr);
</script>
</body>
</html>
- 效果图
2.传参解构
数组解构
代码块
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script>
let arr = [1,2,3,4,5];
let [,,a,b,c,,] = arr;
let fun = (a,b,c) => {
console.table([a,b,c]);
}
fun(a,b,c);
[a,c] = [c,a];
console.table([a,c]);
</script>
</body>
</html>
效果图
对象解构
代码块
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>对象解构</title>
</head>
<body>
<script>
let obj = {id : 10, name : '手机'};
({id,name} = obj);
console.log(id,name);
let getUser = ({id,name}) => [name,id];
console.log(getUser({id,name}));
</script>
</body>
</html>
效果图
访问器属性的set和get
代码块
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>访问器属性</title>
</head>
<body>
<script>
const product = {
data:[
{id:1,name:'电脑',price:5000,num:5}
],
get total(){
return this.data.reduce((t,c) => (t += c.price * c.num),0);
}
}
console.log(product.total);
let user = {
data : {name},
// 读
get name() {
return this.data.name;
},
// 写
set name(v) {
this.data.name = v;
},
}
user.name = '手机';
console.log(user.name)
</script>
</body>
</html>
效果图
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