<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>清空数组</title>
</head>
<body>
<script>
let a=[1,2,3,4,5];
let aa=a;
//清空数组,
a=[];//将a指向一个空数组，aa还是指向原来引用地址
console.log(a);//[];
console.log(aa);//[1, 2, 3, 4, 5]
//想彻底清空数组使用b.length=0;
let b=[1,2,3,4,5];
let bb=b;
b.length=0;//将b和bb指向的引用地址里放的内容清空
console.log(b);//[]
console.log(bb);//[]
</script>
</body>
</html>
网友评论