js获取页面路径的指定参数值

  //获取页面路径中指定参数的值
        function GetQueryString(name)   
        {          
            var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
            var r = window.location.search.substr(1).match(reg); 
            if (r!=null){               
                return unescape(r[2]);          
            }           
            else{   
                return null;      
            }     
        }

 

GetQueryString("operation");