// 文件流的多此一举请求
  componentDidMount() {
    const that = this;
    fetch('http://172.16.20.202/api/v1/wechat/content/13/media', {
      method: 'GET',
      responseType: 'blob',
    })
      .then(res => {
        console.log(res,89);
        return res.blob()
      }).then(res => {
        const reader = new FileReader();
        reader.readAsDataURL(res);
        reader.onload = (e) => {
          that.setState({ img: e.target.result })
          console.log(e.target.result,0);
        }
      })
  }