【支付宝小程序】我们常用的 'my' 是什么?


支付宝小程序开发中我们使用的 my 其实就是 jsbrige 注入的一个对象。
JSBridge,简单来说就是web和native之间的桥梁,有了它你就可以在web页面中唤起native应用提供的能力。例如:唤起相册,获取应用登陆用户信息等等。

在支付宝小程序中,’my’ 这个对象可读可写。

my.a = 1
console.log(my.a) // 1

遍历 my 对象

 Object.keys(my).forEach(key => {
    console.log(key);
 })

结果:

isIDE 
on 
off 
emit 
callSync 
call 
reLaunch 
navigateTo 
switchTab 
redirectTo 
navigateBack 
postMessage 
createAnimation 
pageScrollTo 
loadPlugin 
SDKVersion 
ExtSDKVersion 
getExtConfigSync 
getAppIdSync 
getExtConfig 
canIUse 
onAppShow 
offAppShow 
onAppHide 
offAppHide 
getLaunchOptionsSync 
onError 
offError 
onUnhandledRejection 
offUnhandledRejection 
env 
createWorker 
connectSocket 
downloadFile 
uploadFile 
request 
uploadFileToAliCloud 
createInnerAudioContext 
getBackgroundAudioManager 
createAudioContext 
reportAnalytics 
reportCustomEvent 
getChinfoChain 
appendChinfoChain 
createSelectorQuery 
navigateToMiniService 
navigateBackFromMiniService 
startMiniService 
setOptionMenu 
getOpenUserInfo 
getPhoneNumber 
getIDNumber 
getRecorderManager 
getUpdateManager 
getFileSystemManager 
createIntersectionObserver 
_fireIntersectionObserver 
loadFontFace 
createRDSContext 
stopPullDownRefresh 
hideKeyboard 
__reportFrameworkPerf 
reportCustomError 
saveSnapshot 
saveTemplateSnapshot 
showSharePanel 
hideDebugVersion 
getSelectedTextRange 
canvasToTempFilePath 
preloadCanvasImage 
createCanvasContext 
_createCanvas 
_createOffscreenCanvas 
createWebViewContext 
createAICameraContext 
createARContext 
createCameraContext 
createLivePlayerContext 
createLivePusherContext 
createLottieContext 
createMapContext 
createVideoContext 
rpc 
ocr 
ap 
startRecord 
stopRecord 
cancelRecord 
playVoice 
pauseVoice 
resumeVoice 
stopVoice 
playBackgroundAudio 
pauseBackgroundAudio 
stopBackgroundAudio 
seekBackgroundAudio 
getBackgroundAudioPlayerState 
onBackgroundAudioPlay 
offBackgroundAudioPlay 
onBackgroundAudioPause 
offBackgroundAudioPause 
onBackgroundAudioStop 
offBackgroundAudioStop 
getAvailableAudioSources 
openBluetoothAdapter 
closeBluetoothAdapter 
getBluetoothAdapterState 
startBluetoothDevicesDiscovery 
stopBluetoothDevicesDiscovery 
getBluetoothDevices 
getConnectedBluetoothDevices 
connectBLEDevice 
disconnectBLEDevice 
writeBLECharacteristicValue 
readBLECharacteristicValue 
notifyBLECharacteristicValueChange 
getBLEDeviceServices 
getBLEDeviceCharacteristics 
onBLECharacteristicValueChange 
offBLECharacteristicValueChange 
onBLEConnectionStateChanged 
offBLEConnectionStateChanged 
onBluetoothDeviceFound 
offBluetoothDeviceFound 
startBeaconDiscovery 
stopBeaconDiscovery 
getBeacons 
onBeaconUpdate 
offBeaconUpdate 
onBeaconServiceChange 
offBeaconServiceChange 
openBLEPeripheral 
closeBLEPeripheral 
addPeripheralService 
removePeripheralService 
updateCharacteristic 
startBLEAdvertising 
stopBLEAdvertising 
onBluetoothAdapterStateChange 
offBluetoothAdapterStateChange 
onCharacteristicRead 
offCharacteristicRead 
onCharacteristicWrite 
offCharacteristicWrite 
onCharacteristicDidSubscribe 
offCharacteristicDidSubscribe 
onCharacteristicDidUnsubscribe 
offCharacteristicDidUnsubscribe 
addPhoneContact 
getSystemInfoSync 
onGyroscopeChange 
offGyroscopeChange 
onAccelerometerChange 
offAccelerometerChange 
onCompassChange 
offCompassChange 
getServerTime 
makePhoneCall 
vibrate 
watchShake 
rsa 
sendSMS 
setKeepScreenOn 
setClipboard 
getClipboard 
scan 
getSystemInfo 
setScreenBrightness 
getScreenBrightness 
startWifi 
stopWifi 
connectWifi 
getWifiList 
setWifiList 
getConnectedWifi 
onGetWifiList 
offGetWifiList 
onWifiConnected 
offWifiConnected 
onMemoryWarning 
offMemoryWarning 
vibrateLong 
vibrateShort 
getHCEState 
startHCE 
stopHCE 
onHCEMessage 
offHCEMessage 
sendHCEMessage 
getBatteryInfo 
getBatteryInfoSync 
onDeviceMotionChange 
offDeviceMotionChange 
getDeviceInfo 
registerSSID 
unregisterSSID 
getCarrierName 
isSystemRoot 
setScreenOrientation 
getScreenOrientation 
getDeviceID 
exit 
seNFCServiceIsv 
addEventCal 
addEventCalendar 
onLowPowerWarning 
offLowPowerWarning 
isLowPowerMode 
getLocation 
openLocation 
chooseLocation 
reGeoCode 
geoCode 
onContinuousLocation 
offContinuousLocation 
startContinuousLocation 
stopContinuousLocation 
calculateRoute 
compressImage 
previewImage 
chooseFileFromDisk 
chooseImage 
chooseVideo 
saveImage 
getImageInfo 
saveVideoToPhotosAlbum 
generateImageFromCode 
saveImageToPhotosAlbum 
textToSpeech 
onAudioInterruptionBegin 
onAudioInterruptionEnd 
offAudioInterruptionBegin 
offAudioInterruptionEnd 
httpRequest 
sendSocketMessage 
closeSocket 
onSocketOpen 
offSocketOpen 
onSocketMessage 
offSocketMessage 
onSocketError 
offSocketError 
onSocketClose 
offSocketClose 
getNetworkType 
onNetworkStatusChange 
offNetworkStatusChange 
sendMtop 
getTBCode 
setTBSessionInfo 
getTBSessionInfo 
openRpc 
tradePay 
getUserInfo 
getAuthCode 
authorize 
getAuthUserInfo 
ARScan 
addCardAuth 
openSetting 
getSetting 
openCustomerService 
getConfigService 
getOpenUserData 
openOtherApplication 
donateInBrowser 
getStorageInfo 
getStorageInfoSync 
setStorage 
setStorageSync 
getStorage 
getStorageSync 
clearStorage 
clearStorageSync 
removeStorage 
removeStorageSync 
showAuthGuide 
getAuthStatus 
alert 
confirm 
prompt 
showToast 
hideToast 
showLoading 
hideLoading 
showNavigationBarLoading 
hideNavigationBarLoading 
setNavigationBar 
showActionSheet 
choosePhoneContact 
chooseAlipayContact 
datePicker 
chooseCity 
multiLevelSelect 
optionsSelect 
chooseContact 
hideShareMenu 
startPullDownRefresh 
setTransparentTitle 
showBackToHomepage 
setViewTop 
setCanPullDown 
setBackgroundImage 
removeBackgroundImage 
setBackgroundColor 
setBackgroundTextStyle 
setBackButton 
setLocatedCity 
onLocatedComplete 
setTabBarBadge 
removeTabBarBadge 
showTabBarRedDot 
hideTabBarRedDot 
setTabBarStyle 
setTabBarItem 
showTabBar 
hideTabBar 
getTitleColor 
regionPicker 
getMenuButtonBoundingClientRect 
onUserCaptureScreen 
offUserCaptureScreen 
onTitleCloseClick 
offTitleCloseClick 
onTitleMoreClick 
offTitleMoreClick 
iotCreateService 
iotCheckService 
saveFile 
removeSavedFile 
getSavedFileInfo 
getSavedFileList 
getFileInfo 
openDocument 
openTaobao 
reportBizReady 
getVisitToken 
navigateToCouponDetail 
openCardList 
openVoucherList 
openTicketList 
openCardDetail 
openVoucherDetail 
openTicketDetail 
openMerchantCardList 
openMerchantVoucherList 
openMerchantTicketList 
openKBVoucherDetail 
paySignCenter 
zmCreditBorrow 
textRiskIdentification 
openCarService 
openChatWindow 
__openLifePayment 
chooseAddress 
getAddress 
startZMCreditRent 
zmRentTransition 
chooseInvoiceTitle 
zmFreeDeposit 
hideAddToDesktopMenu 
hideAllAddToDesktopMenu 
hideFavoriteMenu 
hideAllFavoriteMenu 
setCustomPopMenu 
getRunScene 
navigateToMiniProgram 
navigateBackMiniProgram 
isCollected 
isFavorite 
addToFavorite 
removeFromFavorite 
onFavorite 
offFavorite 
onInternalFavorite 
offInternalFavorite 
canFavorite 
hideBackHome 
getRunData 
isSpeechRecognizeAvailable 
startSpeechRecognize 
stopSpeechRecognize 
onSpeechRecognizeResult 
offSpeechRecognizeResult 
onSpeechRecognizeError 
offSpeechRecognizeError 
startZMVerify 
startAPVerify 
createRtcRoomContext 
getExtConfig 

所有在 my 这个对象上面挂载的方法都在这里了,比文档里面的要多得多。

on 
off 
emit
// A 页面
my.on('test',(res)=>{console.log(1)}) // 被触发,回调被执行,打印出 {a:1}
// B 页面
my.emit('test',{a:1})

这三个函数明显是事件总线的实现机制,经过测试完全可用(未测试低版本基础库) ~

通过 my 实现全局数据共享

一般小程序里面全局数据我们使用 globalData 处理,它本质上也只是一个全局对象。my 的性质和他类似,我们甚至可以修改 my 本身的数据,实现全局的页面数据共享

// A 页面
my.a=1
// B 页面
console.log(my.a) // 1

完全没问题,这还是引用类型数据,如果修改就直接修改啦,不需要获取上一个页面的实例,然后再去写一大摞代码~
eg:

const pages = getCurrentPages();
const lastPage = pages[pages.length - 2];
lastPage.setData({
    a: 1,
});

一对比,明显优雅太多太多了。

警告

本篇博客的一些技法,都不是常规业务实现办法,责任自负。
小程序的这些非公共方法,在使用的时候,最好能做一层 polyfill,防止某些环境某些方法不存在。

参考资料:


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