JS小方法－字符串反转
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"abcd"反转为"dcba"，
1、利用正则和数组反转，无循环
function reverse(oldstr){
var oldStrArr = oldstr.replace(/\w/g,‘$&,‘).split(‘,‘);
return oldStrArr.reverse().toString().replace(/,/g,‘‘);
}
var aa = "abcd";
var bb = reverse(aa);
console.log(bb);//"dcba"
思路："abcd" -> "a,b,c,d," -> ["a","b","c","d",""] ->["","d","c","b","a"] ->"d,c,b,a" -> "dcba"
"abcd" -> "a,b,c,d," －－－：replace(/\w/g,‘$&,‘) //正则
"a,b,c,d," -> ["a","b","c","d",""]－－－：split(‘,‘) //字符串基本API
["a","b","c","d",""] ->["","d","c","b","a"]－－－：reverse() //数组基本API
["","d","c","b","a"] ->"d,c,b,a"－－－：toString() //数组基本API
"d,c,b,a" -> "dcba"－－－：replace(/,/g,‘‘) //正则
2、循环遍历字符串
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