11.2.1 abs方法.html

javascript即用即差核心对象手册

<script>
   with(document)
   {
      with(Math)
      {
        write("abs(0)="+abs(0));
        write("<br>abs(2)="+abs(2));
        write("<br>abs(-2)="+abs(-2));
      }
   }
</script>