<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
</body>
</html>
<script>
var str = 'abc';
//方法一:
// var arr = str.split('');
// var newarr = [];
// for(var i=0;i<arr.length;i++){
// newarr[arr.length-i-1] = arr[i];
// }
// str = newarr.join('');
// console.log(str);
//方法二:
//split(""):根据空字符串拆分数组
// reverse():数组反转元素位置
// join(""):数组转回字符串,且不带分隔符
newStr = str.split("").reverse().join("");
console.log(newStr);
</script>