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Version: 3.x

Entry Component

Every Taro application needs an entry component to register the application. The default entry file is app.js in the src directory.

In the entry component we can set the global state or access the lifecycle of the mini program entry instance.

Example Code

import React, { Component } from 'react'

// If we use the Redux
import { Provider } from 'react-redux'
import configStore from './store'

// Global Style
import './app.css'

const store = configStore()

class App extends Component {
// All React component methods can be used
componentDidMount () {}

// onLaunch
onLaunch () {}

// onShow
componentDidShow () {}

// onHide
componentDidHide () {}

render () {
// Nothing will be rendered in the entry component, but we can do something like state management here
return (
<Provider store={store}>
/* this.props.children is the page that will be rendered */

export default App

Entry Component Configuration

Please refer to the global configuration

Life cycle methods

In addition to supporting React's lifecycle methods, the portal component additionally supports the following lifecycles according to the mini program's standards.

onLaunch (options)

onLaunch of the corresponding app in the mini program environment.

rogram initialization parameters can be accessed during this lifecycle by accessing the options parameter or by calling getCurrentInstance().router.


pathstringPath for launch mini-program
scenenumberScene values for launch mini-program
queryObjectParameters for launch mini-program
shareTicketstringshareTicket,See Get More Forwarding Information
referrerInfoObjectSource information. Source information. Returned when accessing an mini-program from another mini-program, public number or app. Otherwise returns {}
appIdstringSource mini-program, or public number (in WeChat))
extraDataObjectThe data passed from the source mini-program is supported by WeChat and Baidu smart-program at scene=1037 or 1038
sourceServiceIdstringSource plugin, visible when in plugin run mode

The options parameter may vary from field to field in different mini-program

Scene values , there are differences in WeChat Mini-program and Baidu Smart-program, please refer to them respectively Wechat Mini-programBaidu Smart-program Documents

componentDidShow (options)

Triggered when the program is started, or foregrounded.

As with the onLaunch lifecycle, program initialization parameters can be accessed during this lifecycle by accessing the options parameter or calling getCurrentInstance().router.

The parameters are basically the same as those obtained in onLaunch, but with two additional parameters in Baidu Smart-program as follows.

entryTypestringSource identifier, take the value of user/ schema /sys :
user:Indicates before and after passing home
Switching or unlocking the screen, etc. to bring up.
schema:Indicates a protocol call-up;
appURLstringThe call-up protocol at the time of the presentation, which exists only if the value of entryType is schema

componentDidHide ()

Triggered when the program switches to the background.

onPageNotFound (Object)

Triggered when the page to be opened by the program does not exist.


pathstringPath to non-existent page
queryObjectOpen the query parameter of a non-existent page
isEntryPagebooleanWhether it is the first page of this launch