jsp front-end to determine the file format

//表单中的标签    
<table>
<input type="file" name="headPortrait" id="headPortrait" size="14"> 
</table>

//前端判断
<script language="javaScript" type="text/javascript">
    function custCheck() {
var file=document.getElementById("headPortrait");

//取上传文件名的后四位
var str=file.value.slice(-4);

//判断上传的图片格式是否为.jpg格式
if(str!=".JPG"&&str!=".jpg"){
     alert("Warning:请上传jpg格式的图片文件");
     return false;
     }
}
</script>

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