Body OnLoad

HTML

<script src="https://getfirebug.com/firebug-lite-debug.js"></script>
<body onload="console.log('body loaded');">
	<button id="div1" onclick="clickFn()">
		<span id="span1">
			<p id="p1"> </p>
		</span>
    Click
	</button>	
</body>

JavaScript

function clickFn() {
	

var xhr = new XMLHttpRequest();
var url = 'http://maps.googleapis.com/maps/api/distancematrix/json?origins=London&destinations=drove&mode=driving&language=en&sensor=false';
xhr.open('GET', url);
xhr.onreadystatechange = function (data) {
    console.log(JSON.parse(xhr.responseText));
}
xhr.send();

}