How to build query string in javascript?

This article will discuss 'How to build query string in javascript?'. Copy and paste this html code in your page's body tag. 
<input id="Txtname" placeholder="Name" name="Txtname" /> <input id="Txtmobile" placeholder="Mobile" name="Txtmobile"/> <input id="Texemail" placeholder="Email Id" name="Texemail" /> <input type="submit" id="submit" title="Submit" value="Submit" onclick="sendm()" />


On button click below code will fetch text from text-boxes, build query string and redirecting to that query string. Here 'buildUrl' is a function that builds & returns query string.
<script type="text/javascript"> function buildUrl(url, parameters) { var qs = ""; for (var key in parameters) { var value = parameters[key]; qs += encodeURIComponent(key) + "=" + encodeURIComponent(value) + "&"; } if (qs.length > 0) { qs = qs.substring(0, qs.length - 1); //chop off last "&" url = url + "?" + qs; } return url; } function sendm() { var url = "Form.aspx"; var parameters = new Array(); parameters["name"] = document.getElementById('Txtname').value; parameters["mobile"] = document.getElementById('Txtmobile').value; parameters["email"] = document.getElementById('Texemail').value; var site = buildUrl(url, parameters); window.location = site; } </script>