1<script language="JavaScript">
2<!--//
3function validate(){
4var invalid = " "; //非法字符是空格你可以改为其它字符或数字
5if (document.submitform.filename.value.indexOf(invalid) > -1) {
6alert("文件名不能含有空格!");
7return false;
8}
9else {
10return true;
11}
12}
13// -->
14</script>
1<form name="submitform" onsubmit="return validate()">
2<input name="filename" type="file"/>
3<p>
4<input type="submit" value="Submit"/>
5</p></form>