JavaScript Math tan 方法

JavaScript Math tan 方法

<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>