js获取上传文件后缀名（附js提交form表单）
代码如下：
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<
html
>
<
head
>
<
meta
http-equiv
=
"Content-Type"
content
=
"text/html; charset=gb2312"
>
<
script
>
function check_file()
{
var strFileName=form1.FileName.value;
if (strFileName=="")
{
alert("请选择要上传的文件");
return false;
}
var strtype=strFileName.substring(strFileName.length-3,strFileName.length);
strtype=strtype.toLowerCase();
alert(strtype);
if (strtype=="jpg"||strtype=="gif"||strtype=="bmp"||strtype=="png")
return true;
else{
alert("这种文件类型不允许上传！\r\n只允许上传这几种文件：jpg、gif、bmp、png\r\n请选择别的文件并重新上传。");
form1.FileName.focus();
return false;
}
}
</
script
>
</
head
>
<
body
leftmargin
=
"0"
topmargin
=
"0"
>
<
form
action
=
""
method
=
"post"
name
=
"form1"
onsubmit
=
"return check_file()"
enctype
=
"multipart/form-data"
>
<
input
name
=
"FileName"
type
=
"FILE"
class
=
"tx1"
size
=
"20"
>
<
input
type
=
"submit"
name
=
"Submit"
value
=
"上传"
>
</
form
>
<
br
>只允许上传这几种文件：jpg、gif、bmp、png
</
body
>
</
html
>
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下载地址：
http://down.51cto.com/data/2042700
form提交form表单
document.form1.action="success.php";
document.form1.submit();
本文转自许琴 51CTO博客，原文链接：http://blog.51cto.com/xuqin/1640164，如需转载请自行联系原作者
