Global configuration for Mini Programs

App() defines the top-level application and serves as a constructor that creates an App instance. It manages all pages and global data, and provides lifecycle callbacks.

A mini program is an App instance. Each mini program typically includes three files at the top level.

• app.json: Application configuration.

• app.js: Application logic.

• app.acss: Application style (optional).

Sample code

• A simple app.json file:

  {
  "pages": [
    "pages/index/index",
    "pages/logs/logs"
  ],
  "window": {
    "defaultTitle": "Demo"
  }
  }

  This configuration defines two pages, index and logs, and sets the default window title to "Demo".

• A simple app.js file:

  App({
  onLaunch(options) {
    // The mini program is launched for the first time.
  },
  onShow(options) {
    // The mini program is started or reopened from the background.
  },
  onHide() {
    // The mini program is switched from the foreground to the background.
  },
  onError(msg) {
    // A script error occurs or an API call fails.
    console.log(msg);
  },
  globalData: {
    // Global data.
    name: 'mPaaS',
  },
  });