有什么问题请到<a href='/bbs/forums.php?fid=21'>论坛</a>中发表<br> <!--# 特效来源：/js --> <!-- 把下面代码加到<body>区域中 --> <script language=javascript> function checkImage(sId) { if(( document.all[sId].value.indexOf(".gif") == -1) && (document.all[sId].value.indexOf(".jpg") == -1)) { alert("请选择gif或jpg的图象文件"); event.returnValue = false; } } </script> <form action='dddd.php' onsubmit="checkImage('myImg')"> <input type=file id=myImg> <input type=submit name=submit value=submit> </form>
