JS get url parameter modify URL parameter remove URL parameter

JS get url parameter modify URL parameter remove URL parameter

function Urlhelper () {var obj= {}; //gets the value of the URL parameter: name is the name of the parameterObj.getquerystring =function (name) {var reg=NewRegExp ("(^|&)" + name + "= ([^&]*) (&|$)", "I"); var r= WINDOW.LOCATION.SEARCH.SUBSTR (1). Match (REG); if(r! =NULL) {            return(r[2]); }        return NULL; }    //set URL parameter values, ref parameter names, value new parameter valuesObj.changeurlpar =function (URL, ref, value) {var str= ""; if(Url.indexof ('? ')! =-1) Str= Url.substr (Url.indexof ('? ') + 1); Else            returnURL + "?" + ref + "=" +value; var ReturnUrl= ""; var setparam= "";        var arr; var modify= "0"; if(Str.indexof (' & ')! =-1) {arr= Str.split (' & '));  for(i in arr) {if(Arr[i].split (' = ') [0] = =ref) {SetParam=value; Modify= "1"; }                Else{SetParam= Arr[i].split (' = ') [1]; } ReturnUrl= ReturnUrl + arr[i].split (' = ') [0] + "=" + SetParam + "&"; } ReturnUrl= Returnurl.substr (0, Returnurl.length-1); if(Modify = = "0")                if(ReturnUrl = =str) ReturnUrl= ReturnUrl + "&" + ref + "=" +value; }        Else {            if(Str.indexof (' = ')! =-1) {arr= Str.split (' = ')); if(Arr[0] = =ref) {SetParam=value; Modify= "1"; }                Else{SetParam= Arr[1]; } ReturnUrl= Arr[0] + "=" +SetParam; if(Modify = = "0")                    if(ReturnUrl = =str) ReturnUrl= ReturnUrl + "&" + ref + "=" +value; }            ElseReturnUrl= ref + "=" +value; }        returnUrl.substr (0, Url.indexof ('? ')) + "?" +ReturnUrl; }    //Delete parameter valuesObj.delquestr =function (URL, ref) {var str= ""; if(Url.indexof ('? ')! =-1) {str= Url.substr (Url.indexof ('? ') + 1); }        Else {            returnURL; } var arr= ""; var ReturnUrl= ""; var setparam= ""; if(Str.indexof (' & ')! =-1) {arr= Str.split (' & '));  for(i in arr) {if(Arr[i].split (' = ') [0]! =ref) {ReturnUrl= ReturnUrl + arr[i].split (' = ') [0] + "=" + arr[i].split (' = ') [1] + "&"; }            }            returnUrl.substr (0, Url.indexof ('? ')) + "?" + returnurl.substr (0, Returnurl.length-1); }        Else{arr= Str.split (' = ')); if(Arr[0] = =ref) {                returnUrl.substr (0, Url.indexof ('? '))); }            Else {                returnURL; }        }    }    returnobj;}

JS get url parameter modify URL parameter remove URL parameter