本文实例为大家分享了React实现评论添加和删除的具体代码，供大家参考，具体内容如下

一、效果图

二、需求描述

1. 手动输入用户名和评论内容，点击提交；输入内容被追加到右侧评论列表；

2. 点击评论列表的“删除”按钮，弹框提示确定删除用户“xx”；

3. 点击“确定”，“xx”用户发表的评论被删除；

4. 所有评论均被删除时，显示“暂无评论，点击添加评论！！！”

三、代码实现

App.js

import React from 'react';import './App.css';import CommentAdd from '../src/components/CommentAdd'import CommentList from '../src/components/CommentList'import PropTypes from 'prop-types'import "../src/assets/css/bootstrap.css" class App extends React.Component { // 给组件对象指定state属性 // 初始化状态 state = { comments: [ {username: "Tom", content: "React太容易了"}, {username: "Jack", content: "React太难了"} ] } static propTypes = { comments: PropTypes.array.isRequired, addComment: PropTypes.func.isRequired, deleteComment: PropTypes.func.isRequired } addComment = (comment) => { // 将添加的评论追加到评论list上 const {comments} = this.state comments.unshift(comment) // 更新状态 this.setState({comments}) } deleteComment = (index) => { const {comments} = this.state comments.splice(index, 1) this.setState({comments}) } render() { const {comments} = this.state return ( <div> <header className="site-header jumbotron"> <div className="container"> <div className="row"> <div className="col-xs-12"> <h2>评论管理列表</h2> </div> </div> </div> </header> <div className="container"> <CommentAdd addComment={this.addComment}/> <CommentList comments={comments} deleteComment={this.deleteComment}/> </div> </div> ); }} export default App;

CommentAdd.js

import React, {Component} from 'react';import PropTypes from 'prop-types'import "../assets/css/bootstrap.css" class CommentAdd extends Component { state = { username: "", content: "" } static propTypes = { addComment: PropTypes.func.isRequired } handleNameChange = (event) => { const username = event.target.value this.setState({username}); } handleContentChange = (event) => { const content = event.target.value this.setState({content}); } handleSubmit = () => { const comment = this.state this.props.addComment(comment) // 清楚输入数据 this.setState({ username: "", content: "" }); } render() { const {username, content} = this.props return ( <div className="col-md-4"> <form className="form-horizontal"> <div className="form-group"> <label>用户名：</label> <input type="text" className="form-control" placeholder="请输入用户名" value={username} onChange={this.handleNameChange}/><br/> </div> <div className="form-group"> <label>评论内容：</label> <textarea className="form-control" rows="6" placeholder="请输入评论内容" value={content} onChange={this.handleContentChange}> </textarea> </div> <div className="form-group"> <div className="col-sm-offset-2 col-sm-10"> <button type="button" className="btn btn-default pull-right" onClick={this.handleSubmit}>提交 </button> </div> </div> </form> </div> ); }} export default CommentAdd;

CommentList.js

import React, {Component} from 'react';import CommentItem from "./CommentItem";import PropTypes from 'prop-types'import "../assets/css/comment_list.css" class CommentList extends Component { static propTypes = { comments: PropTypes.array.isRequired, deleteComment: PropTypes.func.isRequired } render() { const {comments, deleteComment} = this.props const display = comments.length === 0 ? "block" : "none" return ( <div className="col-md-8"> <h4>评论回复：</h4> <h5 style={{display}}>暂无评论，点击添加评论！！！</h5> <ul> { comments.map((comment, index) => <li key={index}><CommentItem comments={comment} index={index} deleteComment={deleteComment}/> </li>) } </ul> </div> ); }} export default CommentList;

CommentItem.js

import React, {Component} from 'react';import PropTypes from 'prop-types'import "../assets/css/comment_item.css" class CommentItem extends Component { static propTypes = { comments: PropTypes.array.isRequired, deleteComment: PropTypes.func.isRequired, index: PropTypes.number.isRequired } handleDeleteComment = () => { const {comments, deleteComment, index} = this.props if (window.confirm(`确定删除${comments.username}嘛？`)) { deleteComment(index) } } render() { const {comments} = this.props return ( <div className="list-group-item"> <div className="handle"> <a href="javascript:;" rel="external nofollow" onClick={this.handleDeleteComment}>删除</a> </div> <p className="user"><span>{comments.username}</span><span>说：</span></p> <p className="centence">{comments.content}</p> </div> ); }} export default CommentItem;

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。