js正则往空格，全空格，左右空格

String.prototype.Trim = function() 
{ 
   return this.replace(/(^\s*)|(\s*$)/g, ""); 
} 
String.prototype.LTrim = function() 
{ 
   return this.replace(/(^\s*)/g, ""); 
} 
String.prototype.RTrim = function() 
{ 
   return this.replace(/(\s*$)/g, ""); 
}