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浅谈JavaScript中的Math.atan()方法的使用_基础知识

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Release： 2016-05-16 15:55:02

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此方法返回弧度的反正切。atan方法返回一个在-pi/2和π/2弧度之间的数值。
语法

Math.atan( x ) ;

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下面是参数的详细信息：

x : 一个数字

返回值:

返回一个数弧度的反正切值

例子：

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

var value = Math.atan(-1);
document.write("First Test Value : " + value ); 
 
var value = Math.atan(.5);
document.write("<br />Second Test Value : " + value ); 

var value = Math.atan(30);
document.write("<br />Third Test Value : " + value ); 

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

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这将产生以下结果：

First Test Value : -0.7853981633974483
Second Test Value : 0.4636476090008061
Third Test Value : 1.5374753309166493
Fourth Test Value : NaN

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Related labels：

javascript math

source：php.cn

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