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Explanation of Math.round() method for rounding in JavaScript_Basic knowledge

WBOY
WBOYOriginal
2016-05-16 15:54:541534browse

This method returns the value of a number rounded to the nearest integer.
Grammar

Math.round( x ) ;

Here are the details of the parameters:

  • x: a number

Return value:

  • Returns the value of a number rounded to the nearest integer.

Example: 

<html>
<head>
<title>JavaScript Math round() Method</title>
</head>
<body>
<script type="text/javascript">

var value = Math.round( 0.5 );
document.write("First Test Value : " + value ); 
 
var value = Math.round( 20.7 );
document.write("<br />Second Test Value : " + value ); 

var value = Math.round( 20.3 );
document.write("<br />Third Test Value : " + value ); 

var value = Math.round( -20.3 );
document.write("<br />Fourth Test Value : " + value ); 
</script>
</body>
</html>

This will produce the following results: 

First Test Value : 1
Second Test Value : 21
Third Test Value : 20
Fourth Test Value : -20

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