Axios请求图片流

// 设置请求头为application/x-www-form-urlencoded， 设置返回数据格式为arraybuffer
      axios.post(process.env.VUE_APP_BASE_IP + '/tky/tky/vuelogin/captcha.html', {headers:  {'Content-Type': 'application/x-www-form-urlencoded'}}, {responseType:"arraybuffer"}).then(res => {
        // 这里将得到的图片流转换成blob类型
        const blob = new Blob([res.data], {
          type: 'application/png;charset=utf-8',
        });
        const url = window.URL.createObjectURL(blob);
        this.verifyPic = url;
      })