JS字符串反转

最开始的思路是，先把字符串分割，然后倒序拼接成一个新的字符串。于是有了

方法一：

1var name = "My city is WH";
2var nameArr = name.split('');
3var result=[];
4var resultStr = '';
5for (var i = 0, l = nameArr.length; i < l; i++) {
6    result.unshift(nameArr[i]);
7
8}
9for (var i = 0, l = result.length; i < l; i++) {
10    resultStr += result[i];
11}
12console.log(resultStr);  // HW si ytic yM

**方法二：**reverse()，join()

1var name = "My city is WH";
2var resultStr = name.split('').reverse().join(''); 
3console.log(resultStr);  // HW si ytic yM

方法三： charAt()

1var name = "My city is WuHan";
2var nameArr = name.split('');
3var resultStr = '';
4for (var i = nameArr.length-1; i >= 0; i--) {
5    resultStr += name.charAt(i);
6}
7console.log(resultStr); // naHuW si ytic yM