data.append("file", _this.file); //
      data.append("token", _this.postData.token);
      data.append("key", _this.postData.key);
      axios.post(_this.url, data).then(function(res) {
        console.log(res);
      })
key and hash have been returned in res, but why do I see this file in the background of Qiniu, but I can"t show the picture and file when previewing?
  
 
