vue 将图片流转换为 base64 的图片 src

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getVerify() {   let that = this;   axios({     method: "GET",     url: `http://192.168.7.61:3000/base/BaseApiService/createCaptchaCode?access_token=bjcenter`,     responseType: "arraybuffer", //这个在请求头里必须加   })     .then((res) => {       return (         "data:image/png;base64," +         btoa(           new Uint8Array(res.data).reduce(             (data, byte) => data + String.fromCharCode(byte),             ""           )         )       );     })     .then((res) => {       that.verify = res;       console.log("res", res);     })     .catch((e) => {       console.log(e);     }); },