ajax提交表单包括文件

<script
src="${pageContext.request.contextPath}/assets/js/jquery-1.8.3.js"></script>

<script type="text/javascript">
$(function() {$("#upload").click(function() {
var formData = new FormData($("#uploadForm")[0]);$.ajax({
url : "${pageContext.request.contextPath}/uploadoldimage", type : 'POST', data : formData, async : false, cache : false, contentType : false, processData : false, success : function(data) { var obj = eval('(' + data + ')'); if (obj.status == 'success') { alert("上传完成");$("#posterShow").attr("src",obj.imgurl);
$("#posterShow").css("width","450px");$("#posterShow").css("height","300px");
$("#showimg").val(obj.imgurl);
}
},
error : function() {
alert("网络异常");
}
});
})
})
</script>

支持主流浏览器 

非要用IE还是另寻他法吧