<SCRIPT LANGUAGE="javascript"> <!-- currdate = new Date("2005/6/4 09:00:10");//当前日期 uptodate = new Date("2004/6/4 09:00:10");//截止日期，可以自己带入变量 if(uptodate<currdate) alert('非法日期!'); //--> </SCRIPT> <input method=post></input>