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、效果图一、效果图二、需求描述二、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 (


);
}
}

export default App;
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 (


);
}
}

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 (


);
}
}

export default CommentAdd;
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 (


);
}
}

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 (



);
}
}

export default CommentList;
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 (



);
}
}

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 (


);
}
}

export default CommentItem;
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 (


);
}
}

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。