el-upload上传图片到七牛云或阿里云

（1）绑定上传地址，上传数据对象

（2）定义数据

// 商户的driver
driver: null,
// 图片上传的路径
uploadUrl: '',
// 上传图片的携带的信息
uploadData: {},
// 图片的链接头部分
cdn: ""

（3）定义方法

        图片的路径就是图片头加上返回的key

/**
 * 获取获取商户的driver
 */
async getDriver() {
   let res = await customerService.getDriver();
   if (res.code == 200) {
       this.driver = res.data.cdn_driver;
       this.cdn = res.data.cdn;
       this.driver ? this.getUploadToken() : "";
   }
},
/**
 * 上传图片获取token
 */
async getUploadToken() {
   let params = {
      driver: this.driver
   };
   let res = await customerService.getUploadToken(params);
   if (res.code == 200) {
      switch (this.driver) {
        case 'oss':
            this.uploadData = {
                OSSAccessKeyId: res.data.accessid,
                policy: res.data.policy,
                success_action_status: '200',
                callback: res.data.callback,
                signature: res.data.signature,
                dir: res.data.dir
            };
            this.uploadUrl = res.data.host;
            break;
         case 'qiniu':
            this.uploadData = {
                dir: '',
                token: res.data.token
             };
            this.uploadUrl = "https://up.qiniup.com";
       }
   }
},
/**
 * 上传图片成功
 */
handleSuccess(res, file, fileList) {
   // 图片的路径就是图片头加上返回的key
   let imgUrl = `${this.cdn}${res.key}`;
}