JavaScript全局变量未更新值

我有下面的JavaScript代码来开发Fuse Tools中的应用程序。最后一个错误我似乎无法理解，那就是我的变量b64data应该是一个全局变量，并且没有从capturePhoto函数更新它的值，并让我将submitPhoto函数中更新的值发送到服务器。它应该发送base64编码值作为my POST函数中的picture变量。感谢您的帮助

var Observable = require("FuseJS/Observable");
let ImageTools = require("FuseJS/ImageTools");
var FileSystem = require("FuseJS/FileSystem");
var Base64 = require("FuseJS/Base64");
var Camera = _camera;
var b64data;

var captureMode = Observable();
var flashMode = Observable();

function getCameraInfo() {
    Camera.getCameraInfo()
        .then(function(info) {
            console.log("captureMode: " + info[Camera.INFO_CAPTURE_MODE]);
            console.log("flashMode: " + info[Camera.INFO_FLASH_MODE]);
            console.log("cameraFacing: " + info[Camera.INFO_CAMERA_FACING]);
            console.log("supportedFlashModes: " + info[Camera.INFO_SUPPORTED_FLASH_MODES].join());

            captureMode.value = info[Camera.INFO_CAPTURE_MODE];
            flashMode.value = info[Camera.INFO_FLASH_MODE];

            if (Camera.INFO_PHOTO_RESOLUTIONS in info) {
                var availableResolutions = info[Camera.INFO_PHOTO_RESOLUTIONS];
                availableResolutions.forEach(function(e) {
                    console.log(e.width + "x" + e.height);
                });
                photoResolution = availableResolutions[Math.floor(availableResolutions.length * 0.4)];

                var options = {};
                options[Camera.OPTION_PHOTO_RESOLUTION] = photoResolution;

                Camera.setPhotoOptions(options)
                    .then(function() {
                        console.log("New photo options set: " + JSON.stringify(options));
                    })
                    .catch(function(error) {
                        console.log("Failed to set photo options: " + error);
                    });
            }
        })
        .catch(function(err) {
            console.log("Failed to get camera info: " + err);
        });
}
getCameraInfo();

function nextFlashMode() {
    if (flashMode.value == Camera.FLASH_MODE_AUTO) return Camera.FLASH_MODE_ON;
    else if (flashMode.value == Camera.FLASH_MODE_ON) return Camera.FLASH_MODE_OFF;
    else if (flashMode.value == Camera.FLASH_MODE_OFF) return Camera.FLASH_MODE_AUTO;
    else throw "Invalid flash mode";
}

function setCaptureMode(cm) {
    Camera.setCaptureMode(cm)
        .then(function(mode) {
            captureMode.value = mode;
            console.log("Capture mode set to: " + mode);
        })
        .catch(function(err) {
            console.log("Failed to set capture mode: " + err);
        });
}

function capturePhoto() {
    Camera.capturePhoto()
        .then(function (photo) {
            photo.save()
                .then(function(filePath) {
                    console.log("Photo saved to: " + filePath);
                    var arrayBuff = FileSystem.readBufferFromFileSync(filePath);
                    var b64data = Base64.encodeBuffer(arrayBuff); // send this to the backend
                    photo.release();
                })
                .catch(function(error) {
                    console.log("Failed to save photo: " + error);
                    photo.release();
                });
        })
        .catch(function (error) {
            console.log("Failed to capture photo: " + error);
        });
}

var isRecording = Observable(false);
var recordingSession = null;

function startRecording() {
    isRecording.value = true;
    Camera.startRecording()
        .then(function (session) {
            recordingSession = session;
        })
        .catch(function (error) {
            console.log("Failed to start recording: " + error);
            isRecording.value = false;
        });
}

function stopRecording() {
    isRecording.value = false;
    recordingSession.stop()
        .then(function (recording) {
            router.push("VideoPage", recording.filePath());
        })
        .catch(function (error) {
            console.log("Failed to stop recording: " + error);
        });
    recordingSession = null;
}

var cameraBack = true;
function flipCameraFacing() {
    var front = Camera.CAMERA_FACING_FRONT;
    var back = Camera.CAMERA_FACING_BACK;
    Camera.setCameraFacing(cameraBack ? front : back)
        .then(function (newFacing) {
            cameraBack = newFacing == back;
            getCameraInfo();
            console.log("Camera facing set to: " + (newFacing == back ? "back" : "front"));
        })
        .catch(function (err) {
            console.log("Failed to set camera facing: " + err);
        });
}

function changeFlashMode() {
    Camera.setFlashMode(nextFlashMode())
        .then(function(newFlashMode) {
            flashMode.value = newFlashMode;
            console.log("Flash mode set to: " + flashMode.value);
        })
        .catch(function(err) {
            console.log("Failed to set flash mode: " + err);
        });
}

var name = Observable();
var email = Observable();
var market = Observable();

module.exports = {
    name: name, 
    email: email,
    market: market,
    b64data: b64data,
    submitPhoto: submitPhoto,
    captureMode: captureMode,
    setCaptureModePhoto: function () { setCaptureMode(Camera.CAPTURE_MODE_PHOTO); },
    setCaptureModeVideo: function () { setCaptureMode(Camera.CAPTURE_MODE_VIDEO); },
    capturePhoto: capturePhoto,
    startRecording: startRecording,
    stopRecording: stopRecording,
    isRecording: isRecording,
    flipCameraFacing: flipCameraFacing,
    flashMode: flashMode,
    changeFlashMode: changeFlashMode,
}

function submitPhoto(){ 


    console.log("name: "+name);
    console.log("email: "+email);
    console.log("market: "+market);


    fetch('http://fanbeauties.com/app/submit-photo.php?pass=MY_PASS', { 
    method: "POST", 
    headers: {
      "Content-type": "application/x-www-form-urlencoded; charset=UTF-8"
    },
    body: '&name='+name+'&email='+email+'&market='+market+'&picture='+b64data
     });


};

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可能是因为您正在共享代码第72行的capturePhoto函数中再次声明B64数据

试一试 B64数据=。。。 而不是

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var b64data=…

可能是因为您在承诺中设置了它，但不要等到承诺完成后才尝试使用它