How to use pow function-JS Tutorial-php.cn

How to use pow function

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Release： 2019-02-16 15:35:54

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The Math.pow() function in How to use pow function is used to represent the power of a number, which can return the value of x raised to the y power. Let’s take a look at the specific use of the pow function.

How to use pow function

Let’s take a look at the basic syntax of the pow function

Math.pow（base, exponent）

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base represents the base.

exponent represents the index.

Description: If the result is an imaginary or negative number, this method will return NaN. If a floating point overflow occurs due to an exponent that is too large, this method returns Infinity.

Let’s take a look at an example of pow function application

When both base and exponent are positive numbers passed as parameters:

The code is as follows

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title></title>
</head>
<body>
<script type="text/javascript"> 
    document.write(Math.pow(9, 3)); 
</script> 
</body>
</html>

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The execution result is as follows: 9 to the third power

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When the base value is negative and exponent is positive:

The code is as follows

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title></title>
</head>
<body>
<script type="text/javascript"> 
    document.write(Math.pow(-9, 3)); 
</script> 
</body>
</html>

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The execution result is as follows: -9 raised to the third power

-729

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When the base value is positive and exponent is negative:

The code is as follows

<script type="text/javascript"> 
    document.write(Math.pow(9, -3)); 
</script>

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The execution result is as follows: 1/9 to the third power

0.0013717421124828531

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