<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script>
let arr=[1,2,3,4,5];
console.log("需求,怎么清空数组。"+"<br />");
arr=[];
console.log(arr);
arr.length=0;
console.log(arr);
arr.splice(0,arr.length);
console.log(arr);
console.log("需求:怎么将数组转换成字符串"+"<br />");
let str=arr.toString();
console.log(str);
console.log(typeof str);
console.log("如何将数组转换成指定格式字符串"+"<br />");
let str8=arr.join("+");
console.log(str8);
console.log(typeof str8);
console.log("如何将两个数组拼接为一个数组"+"<br />");
let arr11=[1,2,3];
let arr22=[4,5,6];
let res666=arr11+arr22;
console.log(res666);
</script>
</body>
</html>