To generate random values, JavaScript provides Math.random() method. This method generates values in the range 0.0 and 1.0, 1.0 excluded. We can use this function according to our requirements.
Here , if I give an example of a six sided dice. we would need a random number between 1 to 6 , both included.
The formula is Math.floor( lower + Math.random() * upper ). lower is the starting value and is called shifting value. upper is the maximum value and is called scaling value. Here is the complete code.
<html>
<head>
<title> Generate Random Numbers </title>
<script type="text/javascript">
<!--
function getRandom()
{
var ran = Math.floor( 1 + Math.random() * 6);
window.alert(" you got " + ran);
}
// -->
</script>
</head>
<body>
<input type="button" value="next number" onclick="getRandom()" />
</body>
</html>
Note : If you omit the floor function, it will give you float values and also values between 6 and 7, which is not the requirement. However, if you require float values you can skip floor function and check if the value is > 6 then make it back to 6 before it is displayed.
I hope it was useful :)
No comments:
Post a Comment