<INPUT TYPE="file" name=vvv>
<INPUT TYPE="button" onclick=aaa() value="测试">
<script>
function aaa()
{
str = document.all.vvv.value;
dd=str.indexOf(".")
alert(document.all.vvv.value.substring(dd+1, str.length)+"文件");
}
</script>
<INPUT TYPE="button" onclick=aaa() value="测试">
<script>
function aaa()
{
str = document.all.vvv.value;
dd=str.indexOf(".")
alert(document.all.vvv.value.substring(dd+1, str.length)+"文件");
}
</script>
然后 return false 还是true