--form表单使用ajax提交，获取回调函数

//页面部分

<div class="top-left">
<form id="domainExtendMsgSubmitForm" action="<%=path%>/domain/domainExtendMsgImport.htm"                 enctype="multipart/form-data" method="post">
<input type="file" name="file" style="color: white;"  />
<input type="hidden" name="pageCount" value="${page.rowCount }"  />
<input type="button" value="导入excel" onclick="domainExtendMsgSubmit()"/><span style="font-size:10px;             color: white; ">(仅支持xls格式)</span>
</form>
</div>

//js部分：

function domainExtendMsgSubmit() {

//        $("#domainExtendMsgSubmitForm").submit();

//domainExtendMsgSubmitForm为form表单id

    var formData = new FormData($("#domainExtendMsgSubmitForm")[0]);

    //formData.append('sgid',_sgId); 添加表单之外的参数

    $.ajax({

               url: '<%=path%>/domain/domainExtendMsgImport.htm',

               type: 'POST', 

               data: formData, 

               cache: false,

               dataType: "json", //预期服务器返回的数据类型

                                //注意这里一定要设置contentType:false，不然会默认为传的是字符串，这样文件就传不过去了

               contentType: false, 

               processData: false, 

               success: function (data) {

                   if (data.code == 0) {

                        window.location.reload();

                   } else {

                        alert(data.msg);

                        window.location.reload();

                   }

               }, 

               error: function (data) {

                   alert(data.msg);

               } 

          });

      }