JavaScript Math.cos() 方法详解与使用示例

语法格式

Math.cos( x ) ;

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

var value = Math.cos(90);
document.write("First Test Value : " + value ); 
 
var value = Math.cos(30);
document.write("<br />Second Test Value : " + value ); 

var value = Math.cos(-1);
document.write("<br />Third Test Value : " + value ); 

var value = Math.cos(2*Math.PI);
document.write("<br />Fourth Test Value : " + value ); 
</script>
</body>
</html>

First Test Value : -0.4480736161291701
Second Test Value : 0.15425144988758405
Third Test Value : 0.5403023058681398
Fourth Test Value : 1