记一次vue普通异步请求微信二进制二维码乱码问题解决然后渲染

  /*用微信小程序token拿二维码*/
async fetchMINIQRcode({commit,state},params){
    var instance = axios.create({
      responseType: 'blob', //返回数据的格式，可选值为arraybuffer,blob,document,json,text,stream，默认值为json
    })
let data = await instance.post('https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=' + params.access_token, params.params).then(res => res.data)
    return data;
  }


  //拿值 MINI
 if (MINI) {
    var blob = new Blob([MINI], {
       type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8'
    });
    t.QRcode = URL.createObjectURL(blob);
    t.QRcode_col = true;
   }