<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
//输入字符串，然后逆序输出出来.
var a=prompt("请输入字符串·");
var b=a.split('');
var arr=[];
for(var i=b.length-1;i>=0;i--)
{
arr+=b[i];
}
console.log(arr);
</script>
</body>
</html>
