FileUpload1上传的文件类型_控制

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<tr>

<td height="25" align="right">

传真件：

</td>

<td >

<asp:FileUpload ID="FileUpload1" onpropertychange="ck(this)" runat="server" Width="350px" />

</td>

</tr>

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<script>

function ck(obj){if(obj.value.length>0){

var af="jpg,gif,png,jpeg,bmp";

if(eval("with(obj.value)if(!/"+af.split(",").join("|")+"/ig.test(substring(lastIndexOf('.')+1,length)))1;"))

{alert("允许上传的文件类型:/n"+af);obj.createTextRange().execCommand('delete')};

}

}

</script>