JS来动态的修改url实现对url的增删查改

<script>var LG=(function(lg){var objURL=function(url){this.ourl=url||window.location.href;this.href="";//?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?前面存入this.href,参数解析为this.params对象，#号及后面存入this.jingobjURL.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("?");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.paramsobjURL.prototype.set=function(key,val){this.params[key]=val;}//只是设置this.paramsobjURL.prototype.remove=function(key){this.params[key]=undefined;}//根据三部分组成操作后的urlobjURL.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+="?"+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balert(myurl.get ("a"));//取参数a的值，这里得到1myurl.set("a",23); //修改a的值为23alert (myurl.url());</script>