How to get query string parameters using javascript

get-query-str-variable.js

// example url='ex.com/index.php?name=heyhey'

// get name param. from query string
var name=getQueryVariable('name');

function getQueryVariable(variable)
{
       var query = window.location.search.substring(1);
       var vars = query.split("&");
       for (var i=0;i<vars.length;i++) {
               var pair = vars[i].split("=");
               if(pair[0] == variable){return pair[1];}
       }
       return(false);
}