1.引用依赖

<SCRIPT language=JavaScript src="<%=request.getContextPath()%>/include/jquery-1.6.4.js"></SCRIPT>
<SCRIPT language=JavaScript src="<%=request.getContextPath()%>/include/jquery.form.min.js"></SCRIPT>

2.编写表单内容

<form id="uploadForm" enctype="multipart/form-data" method="post" style="display: none;background-color: rgb(242,250,255);"action="<%=request.getContextPath() %>/servlet/imageInvoiceServlet?_actionType=invoiceOcr"><input name="orderId" type="hidden" value="<%=orderId%>"><input name="businessNo" type="hidden" value="<%=businessNo%>"><input name="userToken" type="hidden" value="<%=userToken%>">&nbsp;上传发票至影像系统：<input type="file" name="fileInput" id="fileInput" style="width: 500px;"/><a href="javascript:void(0)" id="btnAjaxSubmit" onclick="uploadFile()">&nbsp;提交</a>
</form>

3.通过ajax异步提交表单并上传文件

	// 提交表单并上传文件function uploadFile() {var options = {success:    function() {alert('Thanks for your comment!');$("#fileInput").val();$("#uploadForm").hide();} };// 将options传给ajaxForm$('#uploadForm').ajaxForm(options);// 提交表单$("#uploadForm").ajaxSubmit(options);}