React里的Fragment标签（React.Fragment）

react return里返回多个元素值要有父标签包裹。

React.Fragment组件能够在不额外创建 DOM 元素的情况下，让 render()方法中返回多个元素。相当于空标签<>。

import React, { Component, Fragment } from "react";
import "./App.css";

class App extends Component {
  render() {
    return (
      <>
        
          
          按钮
        
        

          
哈
          
咯
        
      
    );
  }
}

export default App;

和<>实现效果一致。

import React, { Component, Fragment } from "react";
import "./App.css";

class App extends Component {
  render() {
    return (
      
        
          
          按钮
        
        

          
哈
          
咯
        
      
    );
  }
}

export default App;

 就不用在头部引入了↓：

import React, { Component } from "react";
import "./App.css";

class App extends Component {
  render() {
    return (
      
        
          
          按钮
        
        

          
哈
          
咯
        
      
    );
  }
}

export default App;

import React, { Component, Fragment } from "react";
import "./App.css";

class App extends Component {
  render() {
    return (
      
        
          
          按钮
        
        

          
哈
          
咯
        
      
    );
  }
}

export default App;

Fragment标签支持能接受键值或属性，可以遍历循环渲染元素

import React, { Component } from "react";
import "./App.css";

const list = [
  { id: 0, name: "凤凰火", description: "最肉" },
  { id: 1, name: "彼岸花", description: "花花" },
];
class App extends Component {
  render() {
    return list.map((item) => (
      
        

          {item.name}是{item.description}
        
      
    ));
  }
}

export default App;