jq上传文件

<form id="importFileForm" method="post" enctype="multipart/form-data" style="display:">

            <table style="margin:5px;height:70px;">

                <tr>

                    <td></td>

                    <td width="5px;"></td>

                    <td><input class="easyui-filebox" id="fileImport" data-options="buttonText:'选择',prompt:'请选择文件...'"  name="fileImport" style="width:260px;">

                    </td>

                    <td><a id="uploadFile" class="easyui-linkbutton" data-options="iconCls:'icon-ok'" href="javascript:void(0)">上传</a></td>

                </tr>

                <tr>

                    <td colspan="4">

                        <label id="uploadInfo" />

                    </td>

                </tr>

            </table>

  </form>

    <script>

        //导入文件

        $("#uploadFile").click(function () {

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

            //调用apicontroller后台action方法，将form数据传递给后台处理。contentType必须设置为false,否则chrome和firefox不兼容

            $.ajax({

                url: "http://localhost:12745/api/easyuiUpload/PostExcelData",

                type: 'POST',

                data: formData,

                async: false,

                cache: false,

                contentType: false,

                processData: false,

                success: function (returnInfo) {

                    //上传成功后将控件内容清空，并显示上传成功信息

                    document.getElementById('fileImport').value = null;

                    document.getElementById('uploadInfo').innerHTML = "<span style='color:Red'>" + returnInfo + "</span>";

                },

                error: function (returnInfo) {

                    //上传失败时显示上传失败信息

                    document.getElementById('uploadInfo').innerHTML = "<span style='color:Red'>" + returnInfo + "</span>";

                }

            });

            

        })

    </script>
如果出现：TypeError: 'append' called on an object that does not implement interface Fo
在ajax中加入两行：


processData:false,

contentType:false