Four, React create components, JSX data binding syntax

Access: https: //www.cnblogs.com/chenxi188/p/11702799.html

Spend my-app-built section of the project:

my-app/
  README.md
  node_modules/
  package.json
  .gitignore
  public/
    favicon.ico
    index.html
    manifest.json
  src/
    App.css
    App.js
    App.test.js
    index.css
    index.js
    logo.svg

A binding state data state

1. Create a new componets in the src directory, to put its own components built:

In the components folder, a new component: home.js enter the following

React Import, {from} the Component 'REACT' ; 

class Homes the extends the Component { 
    // the next two Stationary written 
    constructor () { 
        Super (); 
        
                // the following acts to establish a status component data 
        the this .STATE = { 
         name: " alice " , 
         Age: 20 is , 
         Sex: " female " , 
         UserInfo: {username: 'Sky' } 
        } 
    } 
        
    the render () { 

                // following this.state.xxx bind to the status data to a front end 
        return (
             <div> 
                <h2> this is Home.js assembly </ H2> 
                <P>My name is: { the this} .state.name </ the p-> 
                <the p-> my age is: { the this .state.age} </ the p-> 
                <the p-> My gender is: { the this .state.sex} </ the p-> 
                <the p-> I username: { the this .state.userinfo.username} </ P> 
            </ div>                      );         
    } 
}; 
Export default Homes;

2. Then APP.js root into the following components:

React Import, {from} the Component 'REACT' ; 
Import logo from './logo.svg' ; 
Import './App.css' ; 

// introduced from the components folder written Home.js assembly 
import Homes from' ./components/Home ' ; 

class the app the extends the component { 
// following <Homes /> is written when the home assembly invoked to 
  the render () {
     return (
     <className = div "the app"> 
     <h1 of> here app .js root element </ h1 of> 
     
     <Homes /> 
    </ div>     );} 
} 
Export default the App;

3. Run: Back to my-app items in cmd run code, project start to see results

Elevation start

running result: