前端展示后端返回的图片(二维码)

penQRcode(){
                axios.request({
                    url:"/xxx",
                        responseType: 'blob',
                        method: 'post',
                        //params:{
                        //    fileName:fileName
                        //}
                    }).then(res => {
                        let blob = new Blob([res.data],{type: "image/png"});
                        let url = window.URL.createObjectURL(blob);
                        this.qrcodeImag=url;//img-src
                    }), (err) => {
                      this.showMessage('error', err.message)
                    }
            },