How to get Query String from URL in Javascript

function getQueryStringFromURL(key)
var queryString =;
var subQrString = queryString.substring(1);

var arrQueryString = new Array();
var arr = subQrString.split(‘&’);
var index = -1;

for (var i=0;i<arr.length;i++)
index = arr[i].indexOf(‘=’);

if (key == arr[i].substring(0, index).toUpperCase())
return arr[i].substring(index + 1);

return null;


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