1 //获取字符串字节长度
2 String.prototype.charLen = function() {
3 var self = this;
4 if(""==self) return 0;
5 var l=0;
6 for(var i=0;i<self.length;i++)
7 {
8 if(self.charCodeAt(i)>255) l+=2;
9 else l++;
10 }
11 return l;
12 };
13
14 //删除字符串左边空格
15 String.prototype.ltrim = function() {
16 var self = this;
17 if("" == self) return '';
18 return self.replace(/(^\s*)/g,"");
19 }
20
21 //删除字符串两端空格
22 String.prototype.trim = function() {
23 var self = this;
24 if("" == self) return '';
25 return self.replace(/(^\s*)|(\s*$)/g, "");
26 };
27
28 //删除字符串右边空格
29 String.prototype.ltrim = function() {
30 var self = this;
31 if("" == self) return '';
32 return self.replace(/(\s*$)/g,"");
33 }
