Dynamically modify the URL through JS to add, delete, check and modify the URL_javascript skills

 <script>
 
 var LG=(function(lg){
   var objURL=function(url){
     this.ourl=url||window.location.href;
     this.href="";//&#63;前面部分
     this.params={};//url参数对象
     this.jing="";//#及后面部分
     this.init();
   }
   //分析url,得到&#63;前面存入this.href,参数解析为this.params对象，#号及后面存入this.jing
   objURL.prototype.init=function(){
     var str=this.ourl;
     var index=str.indexOf("#");
     if(index>0){
       this.jing=str.substr(index);
       str=str.substring(0,index);
     }
     index=str.indexOf("&#63;");
     if(index>0){
       this.href=str.substring(0,index);
       str=str.substr(index+1);
       var parts=str.split("&");
       for(var i=0;i<parts.length;i++){
         var kv=parts[i].split("=");
         this.params[kv[0]]=kv[1];
       }
     }
     else{
       this.href=this.ourl;
       this.params={};
     }
   }
   //只是修改this.params
   objURL.prototype.set=function(key,val){
     this.params[key]=val;
   }
   //只是设置this.params
   objURL.prototype.remove=function(key){
     this.params[key]=undefined;
   }
   //根据三部分组成操作后的url
   objURL.prototype.url=function(){
     var strurl=this.href;
     var objps=[];//这里用数组组织,再做join操作
     for(var k in this.params){
       if(this.params[k]){
         objps.push(k+"="+this.params[k]);
       }
     }
     if(objps.length>0){
       strurl+="&#63;"+objps.join("&");
     }
     if(this.jing.length>0){
       strurl+=this.jing;
     }
     return strurl;
   }
   //得到参数值
   objURL.prototype.get=function(key){
     return this.params[key];
   }  
   lg.URL=objURL;
   return lg;
 }(LG||{}));
 
     var myurl=new LG.URL(window.location.href);
     myurl.remove("b"); //删除了b
     alert(myurl.get ("a"));//取参数a的值，这里得到1
     myurl.set("a",23); //修改a的值为23
     alert (myurl.url());
 </script>