首先要引用jquery-form.j和jquery.js

<form id='uploadForm' action="zrarBLH_upload.do" method="post" enctype="multipart/form-data" accept-charset="utf-8">
 <div class="icon_btn file_btn" >//按鈕的樣式
 <input type="file"   onchange="zrar_submit()" 
style="cursor: pointer;width:18px;height:16px;opacity: 0;filter:progid:DXImageTransform.Microsoft.Alpha(Opacity=0);-ms-filter:'progid:DXImageTransform.Microsoft.Alpha(Opacity=0)';filter: alpha(opacity=0);"
 

 multiple >
 //style是覆蓋按鈕的樣式
</div>
</form>

判斷是不是IE

 if (!!window.ActiveXObject || "ActiveXObject" in window){
            $('#uploadForm').ajaxSubmit(function() {
                alert("提交成功");
            });
        }

提交到後臺