wx.request({ url: 'http://tmp/wx0009f93430dceb3f.o6zAJsxyeFeUYvzbJ8nfjdv2mRzc.4LgpJVDaSB9kda92809aa6220fb9bf3.png', method: 'GET', responseType: 'arraybuffer', success: function (res) { console.log(res); let base64 = wx.arrayBufferToBase64(res.data); console.log(base64); } });