http://www.w3schools.com/jsref/jsref_random.asp
<!DOCTYPE html>
<html>
<body>
<p id="demo">Click the button to display a random number.</p>
<button onclick="myFunction()">Try it</button>
<script type="text/javascript">
function myFunction()
{
document.getElementById("demo").innerHTML=Math.random();
}
</script>
</body>
</html>
Click the button to display a random number.
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