How to get the query parameters after the browser URL? 2 steps to get it done

function getQueryString(name) {
  var value='';
  var reg = new RegExp("(^|&)"+name+"=([^&]*)(&|$)");
  var isQuery=decodeURI(window.location.search).substring(1).match(reg);
  console.log(isQuery);
  if(isQuery!=null){
    value=isQuery[2]
  }
  return value;

  function getQueryStrings() {
  var data={};
  var parameter=(window.location.search.length>0)?window.location.search.substring(1):0;
  if(parameter!=0){
      var arg=parameter.split('&');
      for(var i=0;i<arg.length;i++){
          var name=decodeURIComponent(arg[i].split("=")[0]);
          var value=decodeURIComponent(arg[i].split("=")[1]);
          data[name]=value;
      }
  }else{
      data=null;
  }
  return data;