javascript即用即差核心对象手册

				
				   with(document)
				   {
				      //返回exp函数的几个算例
				      write(e(-2));
				      write(e(0));
				      write(e(2));
				   }
				   //自定义函数返回exp函数值
				   function e(x)
				   {
				      var xstr=new String(x);
				      var rstr= "e"+xstr.sup()+"="+Math.exp(x);
				      return rstr+"";
				   }