后端代码：

# 项目的根目录 起服务后，相对路径可能会改变
basedir = os.path.abspath(os.path.dirname(__file__))

@app.route('/getPic',methods=['GET', 'POST'])
def findpic():
    img_url = basedir+'/static/tt.png'
    print(img_url)
    with open(img_url, 'rb') as f:
        a = f.read()
    '''对读取的图片进行处理'''
    img_stream = io.BytesIO(a)
    img = Image.open(img_stream)


    imgByteArr = io.BytesIO()
    img.save(imgByteArr,format='PNG')
    imgByteArr = imgByteArr.getvalue()
    print(imgByteArr)
    return  imgByteArr

前端代码：

• template:

 <button @click="getPic">获取图片</button>
        <img :src="picurl" alt="beachball" />

• script的methods中:

    //从服务器获取图片
    getPic() {
      var that = this;

      axios({
        method: "get",
        url: "http://127.0.0.1:5000/getPic",
        responseType: "arraybuffer", // 最为关键
      }).then(function (response) {
        that.picurl =
          "data:image/jpeg;base64," + that.arrayBufferToBase64(response.data);
      });
    },
    // ArrayBuffer转为base64字符串
    arrayBufferToBase64(buffer) {
      //第一步，将ArrayBuffer转为二进制字符串
      var binary = "";
      var bytes = new Uint8Array(buffer);
      var len = bytes.byteLength;
      for (var i = 0; i < len; i++) {
        binary += String.fromCharCode(bytes[i]);
      }
      //将二进制字符串转为base64字符串
      return window.btoa(binary);
    },

• script的data中:

picurl: "",//图片url

效果：

点击前：

点击后：