第一种: 循环检查替换
- [javascript]
- // 供使用者调用
- function trim(s){
- return trimRight(trimLeft(s));
- }
- // 去掉左边的空白
- function trimLeft(s){
- if(s == null) {
- return "";
- }
- var whitespace = new String("\t\n\r");
- var str = new String(s);
- if (whitespace.indexOf(str.charAt(0)) != -1) {
- var j=0, i = str.length;
- while (j <i && whitespace.indexOf(str.charAt(j)) != -1){
- j++;
- }
- str = str.substring(j, i);
- }
- return str;
- }
- // 去掉右边的空白 https://www.2cto.com/
- function trimRight(s){
- if(s == null) return "";
- var whitespace = new String("\t\n\r");
- var str = new String(s);
- if (whitespace.indexOf(str.charAt(str.length-1)) != -1){
- var i = str.length - 1;
- while (i>= 0 && whitespace.indexOf(str.charAt(i)) != -1){
- i--;
- }
- str = str.substring(0, i+1);
- }
- return str;
- }
第二种: 正则替换
- [javascript]
- <SCRIPT LANGUAGE="https://www.2cto.com/kf/ware/Java/ Script">
来源: http://www.jianshu.com/p/cf47b6495d4d