Mini Program Framework API App and getApp Parameters

Dongguan mini program development framework interface App and getApp parameters, register mini program. Accepts an Object parameter, which specifies the life cycle callback of the applet, etc. App() must be called in app.js and must be called and can only be called once. Otherwise there will be unpredictable consequences.

App(Object object)

parameter

Object object

For the definition of the front-end and back-end of the mini program and the operation mechanism of the mini program, please refer to the operation mechanism section.

Sample Code

 App({
  onLaunch (options) {
    // Do something initial when launch.
  },
  onShow (options) {
    // Do something when show.
  },
  onHide () {
    // Do something when hide.
  },
  onError (msg) {
    console.log(msg)
  },
  globalData: 'I am global data'})

onLaunch(Object object)

Triggered when the mini program is initialized, and only triggered once globally. Parameters can also be obtained using wx.getLaunchOptionsSync.

Parameters: Same as wx.getLaunchOptionsSync

onShow(Object object)

Triggered when the applet is started or enters the foreground from the background. You can also use wx.onAppShow to bind the listener.

Parameters: Same as wx.onAppShow

onHide()

Triggered when the applet enters the background from the foreground. You can also use wx.onAppHide to bind the listener.

onError(String error)

Triggered when a script error or API call error occurs in the mini program. You can also use wx.onError to bind the listener.

Parameters: Same as wx.onError

onPageNotFound(Object object)

Support is available starting from the basic library 1.9.90, and lower versions need to be compatible.

Triggered when the page that the applet wants to open does not exist. You can also use wx.onPageNotFound to bind the listener. Please refer to wx.onPageNotFound for precautions.

Parameters: Same as wx.onPageNotFound

Sample code:

 App({
  onPageNotFound(res) {
    wx.redirectTo({
      url: 'pages/...'
    }) // If it is a tabbar page, please use wx.switchTab
  }})

AppObject getApp(Object object)

Get the globally unique App instance of the Mini Program.

parameter

Object object

Sample Code

 // other.jsvar appInstance = getApp()console.log(appInstance.globalData) // I am global data

Notice

• Do not call getApp() in a function defined in App() or before calling App. Use this to get the app instance.
• After obtaining the instance through getApp(), do not call lifecycle functions privately.