JavaScript Math Object
Examples
The Math object
The built-in Math object includes mathematical constants and functions. You
do not need to create the Math object before using it.
To store a random number between 0 and 1 in a variable called "r_number":
To store the rounded number of 8.6 in a variable called "r_number":
The Most Common Methods
NN: Netscape, IE: Internet Explorer, ECMA: Web Standard
| Methods |
Explanation |
NN |
IE |
ECMA |
| max(x,y) |
Returns the number with the highest value of x and y |
2.0 |
3.0 |
1.0 |
| min(x,y) |
Returns the number with the lowest value of x and y |
2.0 |
3.0 |
1.0 |
| random() |
Returns a random number between 0 and 1 |
2.0 |
3.0 |
1.0 |
| round(x) |
Rounds x to the nearest integer |
2.0 |
3.0 |
1.0 |
Round
How to round a specified number to the nearest whole number
<html>
<body>
<script type="text/javascript">
document.write(Math.round(7.25))
</script>
</body>
</html>
|
Random number
The random method returns a random number between 0 and 1
<html>
<body>
<script type="text/javascript">
document.write(Math.random())
</script>
</body>
</html>
|
Random number from 0-10
How to write a random number from 0 to 10, using the round and the random method.
<html>
<body>
<script type="text/javascript">
no=Math.random()*10
document.write(Math.floor(no))
</script>
</body>
</html>
|
Max number
How to test which of two numbers, has the highest value.
<html>
<body>
<script type="text/javascript">
document.write(Math.max(2,4))
</script>
</body>
</html>
|
Min number
How to test which of two numbers, has the lowest value.
<html>
<body>
<script type="text/javascript">
document.write(Math.min(2,4))
</script>
</body>
</html>
|
|