JavaScript Math.tan() 方法详解

语法与参数

Math.tan( x ) ;

运行结果

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

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

var value = Math.tan( 45 );
document.write("<br />Third Test Value : " + value ); 

var value = Math.tan( Math.PI/180 );
document.write("<br />Fourth Test Value : " + value ); 
</script>
</body>
</html>

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