Get query string value using ECMA script

In this post, I will explain how to get query string value using ECMA script

<script type="text/ecmascript">

ExecuteOrDelayUntilScriptLoaded(GetValue, "sp.js");

function GetValue()
  {
   var qs = getQueryStringValue();
   var myParam= qs["ID"];
   alert(myParam);  
  }

 function getQueryStringValue()
  {
      var associate  = {};
      var decodevalue = function (s)
      {
        return decodeURIComponent(s.replace(/\+/g, " "));
       };
      var queryString = location.search.substring(1);    
      var keyValues = queryString.split('&');
      for(var sm in keyValues)
      {  
       var key = keyValues[sm].split('=');    
       if (key.length > 1)
        { 
          associate[decodevalue(key[0])] = decodevalue(key[1]); 
         } 
      }   
     return associate; 
   } 
  
</script>