JavaScript Math abs 属性

JavaScript Math abs 属性

<html>

   <head>
      <title>JavaScript Math abs() Method</title>
   </head>

   <body>

      <script type = "text/javascript">
         var value = Math.abs(-1);
         document.write("First Test Value : " + value );

         var value = Math.abs(null);
         document.write("<br />Second Test Value : " + value );

         var value = Math.abs(20);
         document.write("<br />Third Test Value : " + value );

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

   </body>
</html>