/**
 * 下载文档
 * @param {*} data
 */
export function DownDocument(data) {
    return request({
        url: '/v1/Document/DownDocument',
        method: 'get',
        data,
        headers: {isCheck: true, isGet: true},
        responseType: 'blob' # 这个改成blob 这个是关键
    })
}

DownDocument({
    src: src,
    name: name
}).then(response => {
    const href = window.URL.createObjectURL(new Blob([response.data], { type: response.data.type }));
    let downloadElement = document.createElement("a");
    downloadElement.href = href;
    downloadElement.download = name; //下载后文件名
    document.body.appendChild(downloadElement);
    downloadElement.click(); //点击下载
    document.body.removeChild(downloadElement); //下载完成移除元素
    window.URL.revokeObjectURL(href); //释放blob对象
});

<el-upload
            class="upload"
            drag
            action="1"
            multiple
            ref="upload"
            :limit="maxLimit"
            :http-request="addUpload" # 用这个自定义上传来完成
            :before-upload="beforeUpload"
            :on-exceed="handleExceed"
            :on-remove="handleRemove"
        >
            <i class="el-icon-upload"></i>
            <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
            <div
                class="el-upload__tip"
                slot="tip"
            >最多上传{{maxLimit}}个文件，且单文件不超过{{maxSize}}MB</div>
        </el-upload>


        addUpload(params) { # 这边自定义上传 就虚拟下实际只是将文件数据放入一个对象中来记录
            this.fileList[params.file.uid] = {
                file: params.file,
                onSuccess: params.onSuccess, # 进度操作 这三个操作很重要
                onProgress: params.onProgress, # 成功操作
                onError: params.onError, # 失败操作
                uid: params.file.uid,
                type: 'ready' # 通过这个状态来区分文件类型
            }
        }


		# 然后点击上传后 真正的触发多文件上传
		CreateUpload() {
            let self = this, formData = new FormData()
            for (let i in this.fileList) {
                if (this.fileList[i].type == 'ready') {
                    formData.append('document', this.fileList[i].file)
                    formData.append('uid', this.fileList[i].uid)
                }
            }
            formData.append('admin_id', util.cookies.get('uuid'))
            formData.append('type', 1)

            if (formData.get('uid') == null) return this.$message.error('请选择上传文件')

            this.loading = true
            CreateDocument(formData, this.handelProgress)
                .then(async res => {
                    res.map(i => {
                        if (i.res == 1) {
                            this.fileList[i.uid].onSuccess()
                            this.fileList[i.uid].type = 'success'
                        }

                        if (i.res == 2) {
                            this.fileList[i.uid].onError()
                            this.fileList[i.uid].type = 'error'
                        }
                    })
                    this.loading = false
                })
                .catch(() => {
                    this.loading = false
                })
        }

		/**
 * 上传文档
 * @param {*} data
 */
export function CreateDocument(data, progressEvent) {
    return request({
        url: '/v1/Document/CreateDocument',
        method: 'post',
        data,
        headers: { 'content-type': 'multipart/form-data', isCheck: true },
        onUploadProgress: res => {
			# 这边传入进度的回调函数 返回进度来显示文件上传进度
            const percentCompleted = Math.floor((res.loaded * 100) / res.total)
            progressEvent({ percent: percentCompleted })
        }
    })
}