<script type="text/javascript">

       var today=new Date();     //定义当天日期对象

       var year = today.getYear();     //获取年份

       var month = today.getMonth();   //获取月份

       var date = today.getDate();     //获取日期值

       try{

           //定义下个日期对象，日期值加上30天

           var nextDay = new Date(year,month,date+30);   

           //把下个日期对象信息打印出来

           document.write(nextDay.getYear(),'<br>');

           document.write(nextDay.getMonth()+1,'<br>');

           document.write(nextDay.getDate(),'<br>');

       }catch(e){

           alert(e.message);

       }

</script>

运行结果：

2009
10
11