记录vue组件el-upload踩过的几个坑

<el-upload   
                  :before-upload="handleBeforeUpload"
                 :headers = "headers"
                 ....>...
                 </el-upload>

  return {
                headers: {
                    'x-auth-token': localStorage.getItem('token')  
                  //token为系统访问需要的,放在header中
                },
                ...
            };

export const AjaxDownloadFile = (url, param,fileName) => {
    return axios({
        method: 'get',
        url: url.indexOf('http') > -1 ? `${url}` : `${base1}/${url}`,
        data: param,
        responseType: 'blob'
    }).then(data => {
        {
            if (!data) {
                return
            }
            let url = window.URL.createObjectURL(new Blob([data]))
            let link = document.createElement('a')
            link.style.display = 'none'
            link.href = url
            link.setAttribute('download', fileName)

            document.body.appendChild(link)
            link.click()
        }

    });
};