限制文件上传格式例子
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML><HEAD><TITLE>New Document</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<SCRIPT>
function checked(){
var fn=document.all("uploadfile").value;
check(fn);
}
function check(filename)
{
var arr=new Array('jpg','jpeg','gif','png');
var regx=new RegExp(filename.split('.')+'#','gi');
if(regx.test(arr.join('#')+'#'))
{
alert('文件合法,可以上传');
}
else
{
alert('文件不合法,不允许上传');
}
}
</SCRIPT>
<META content="MSHTML 6.00.2900.3132" name=GENERATOR>
<META content="" name=Author>
<META content="" name=Keywords>
<META content="" name=Description></head>
<BODY>
<DIV>
<H2>限制文件上传格式例子</H2>
<hr align="center" width="90%" color="#00CC00">
<UL>
<LI>上传图片<INPUT id=uploadfile type=file name=uploadfile>
<LI><FONT color=#ff0000>*只能上传.jpg,.jpeg,.gif,.png文件！</FONT>
<LI><BUTTON onclick=checked();>检测</BUTTON> </LI></UL></DIV></BODY></HTML>
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