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<script language="javascript">
* 写成类的方法格式如下:str.trim()
String.prototype.trim=function(){ //删除左右两端的空格
return this.replace(/(^\s*)|(\s*$)/g, "");
String.prototype.ltrim=function(){ //删除左边的空格
return this.replace(/(^\s*)/g,"");
String.prototype.rtrim=function(){ //删除右边的空格
return this.replace(/(\s*$)/g,"");
* 写成函数可以这样:trim(str)
function trim(str){ //删除左右两端的空格
return str.replace(/(^\s*)|(\s*$)/g, "");
function ltrim(str){ //删除左边的空格
return str.replace(/(^\s*)/g,"");
function rtrim(str){ //删除右边的空格
return str.replace(/(\s*$)/g,"");

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ghost commented Dec 18, 2017


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