var uploadInst = upload.render({
            elem: '.upload_more'
            , method: 'POST'
            , url: "{:Url('Upload/layuiImgUpload')}"
            , field: 'img'
            , data: {
                dir: 'donation'
            }
            , before: function (obj) {
                var preview = '#preview' + this.id;
                //预读本地文件示例，不支持ie8
                obj.preview(function (index, file, result) {
                    $(preview).attr('src', result); //图片链接（base64）
                });
            }
            , done: function (res) {
                //如果上传失败
                if (res.code > 0) {
                    return layer.msg('上传失败');
                } else {
                    var path = res.data;
                    var name = this.name;
                    console.log(path);

                    $('#' + name).val(path);
                    data[name] = path;
                }
                //上传成功
            }
            , error: function () {
                var imgText = '#imgText' + this.id;
                //演示失败状态，并实现重传
                imgText.html('<span style="color: #FF5722;">上传失败</span> <a class="layui-btn layui-btn-mini demo-reload">重试</a>');
                imgText.find('.demo-reload').on('click', function () {
                    uploadInst.upload();
                });
            }
        });

<div class="layui-form-item">
            <label class="layui-form-label" style="margin-top:30px;">
                活动Banner
            </label>
            <div class="layui-upload">
                <button type="button" class="layui-btn upload_more" lay-data="{id: '1',name:'banner'}">上传图片</button>
                <div class="layui-input-inline input_img_inline">
                </div>
                <div class="layui-upload-list">
                    <img class="layui-upload-img" style="border:none;" id="preview1">
                    <p id="imgText1"></p>
                </div>
            </div>
            <input type="hidden" name="banner" id="banner">
        </div>

<div class="layui-form-item">
            <label class="layui-form-label" style="margin-top:30px;">
                活动Banner
            </label>
            <div class="layui-upload">
                <button type="button" class="layui-btn upload_more" lay-data="{id: '1',name:'banner'}">上传图片</button>
                <div class="layui-input-inline input_img_inline">
                    {if ($detail.banner != '')}
                    <a href="{$detail.banner}" target="_blank">
                        <img src="{:SITE_URL}{$detail.banner}" class="icon_view" title="点击查看完整图片"/>
                    </a>
                    {/if}
                </div>
                <div class="layui-upload-list">
                    <img class="layui-upload-img" style="border:none;" id="preview1">
                    <p id="imgText1"></p>
                </div>
            </div>
            <input type="hidden" name="banner" id="banner" value="{$detail.banner}">
        </div>