Adding url parameters to url in javascrui _ javascript tips-js tutorial

The method for adding url parameters to the url in javascrui is as follows, if the original url contains
Js Code

function addToUrl(obj){ var aprotocol = location.protocol; var ahost = location.host; var apath = location.pathname; var asearch = location.search; var ahash = location.hash; var result = ''; console.log(obj); var joinObj = function(joinObj_obj){ var result = ''; for(var i in joinObj_obj){ result += i + '=' + joinObj_obj[i]; } return result; }; var splitSearchToObj = function(str){ var resObj = {}; var arr = str.split('&'); for(var i = 0; i < arr.length; i++){ resObj[arr[0]] = arr[1]; } return resObj; }; var existObjKey = function(existObjKey_obj, str){ for(var i in existObjKey_obj){ if(i == str){ return true; } } return false; }; var objExtend = function(obj1, obj2){ var result = {}; for(var i in obj1){ if(existObjKey(obj2, i)){ result[i] = obj2[i]; }else{ result[i] = obj1[i]; } } }; if(asearch == ''){ console.log(obj); result = aprotocol + '//' + ahost + apath + '?' + joinObj(obj) + ahash; }else{ var oldSearchObj = splitSearchToObj(asearch.substr(1)); result = aprotocol + '//' + ahost + apath + joinObj(objExtend(oldSearchObj, obj)) + ahash; } return result; } addToUrl({'kd': 'aaa'});