【React】使用react hooks实现评论示例

实现功能

1、渲染评论列表
2、删除评论
3、渲染导航栏和高亮
4、评论列表排序功能
5、获取评论
6、点击发布按钮发布评论
7、清空输入框
8、重新聚焦

实现代码

1、需要引入

import React, { useRef, useState } from 'react'
import avatar from "../logo.png" //头像
import "./css/index.css" //样式

2、样式----[./css/index.css]

* {
    margin: 0;
    padding: 0;
}

.comment-box {
    width: 1000px;
    margin: 20px auto;
    height: 200px;
}

/* 导航栏 */
.comment-tabs {
    display: flex;
    align-items: end;
    font-weight: normal;
    margin-bottom: 20px;
}

.tabs-left {
    margin-right: 20px;
    font-size: 14px;
}

.tabs-left p span {
    margin-left: 6px;
    color: #666;
    font-size: 10px;
}

.tabs-right {
    display: flex;
    color: #666;
    font-size: 10px;
}

.tabs-right .active {
    color: #08a17d;
    font-weight: 500;
}


.tabs-right div span {
    display: inline-block;
    margin: 0 6px;
    height: 6px;
    border-left: 1px solid #666;
}

.tabs-right div:last-child span {
    border: none;
}

/* 发表评论 */
.comment-send {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 40px;
}

.avatar {
    width: 35px;
    height: 35px;
    margin-left: 10px;
    overflow: hidden;
    border-radius: 35px;
    border: 1px solid #08a17d;
}

.avatar img {
    width: 100%;
    height: 100%;
}

.comment-send .content {
    flex: 1;
    margin: 0 10px;
    padding: 0 10px;
    height: 100%;
    line-height: 40px;
    border: none;
    background: #eee;
    border-radius: 4px;
    border: 1px solid #eee;
}

.comment-send .content:hover {
    background: none;
}

.comment-send .button {
    width: 80px;
    height: 100%;
    color: #fff;
    text-align: center;
    line-height: 40px;
    background: #08a17d;
    border-radius: 4px;
}

.comment-send .button:hover {
    cursor: pointer;
}

/* 评论列表 */
.comment-list {
    margin-top: 20px;
}

.comment-item {
    display: flex;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}

.comment-item .right {
    flex: 1;
    margin-left: 10px;
    font-size: 10px;
    color: #666;
    line-height: 20px;
}

.comment-item .right .content {
    color: #000;
    font-weight: 500;
    font-size: 12px;
}

.comment-item .right .like {
    margin: 0 10px;
}

.comment-item .right .delete:hover {
    cursor: pointer;
}

3、数据

// 当前用户数据
const user = {
  uid: "10009",
  avatar,
  uname: "jock"
}

// 导航
const tabs = [
  {
    name: "最新",
    id: 1
  },
  {
    name: "最热",
    id: 2
  },
]
// 评论列表
const comment_list = [
  {
    id: "1",
    content: "真不错",
    time: "2020/1/1 12:00:00",
    like: 1,
    user: {
      uid: "10029",
      avatar,
      uname: "jock"
    }
  },
  {
    id: "2",
    content: "没毛病",
    time: "2020/11/01 12:00:00",
    like: 3,
    user: {
      uid: "10009",
      avatar,
      uname: "jock"
    }
  },
  {
    id: "3",
    content: "真棒",
    time: "2020/8/21 12:00:00",
    like: 10,
    user: {
      uid: "10008",
      avatar,
      uname: "alen"
    }
  },
]

4、逻辑处理

export default function Comment() {
  const [list, setList] = useState(comment_list.sort((a, b) => new Date(b.time) - new Date(a.time)));
  const [type, setType] = useState(1);
  const [content, setContent] = useState("");
  const inputRef = useRef();

  // tab切换
  const handleChange = (id) => {
    setType(id)
    if (id === 1) {
      setList(list.sort((a, b) => new Date(b.time) - new Date(a.time)))
    } else {
      setList(list.sort((a, b) => b.like - a.like))
    }
  }
  //发布
  const handleSend = () => {
    setList([...list, {
      id: Math.random().toString().slice(2),
      content,
      time: new Date().toLocaleString(),
      like: 0,
      user
    }])
    setContent("");
    inputRef.current.focus();
  }
  // 删除
  const handleDel = (id) => {
    setList(list.filter(item => item.id !== id))
  }
  return (
    <div className='comment-box'>
      {/* 导航栏 */}
      <div className='comment-tabs'>
        <div className='tabs-left'>
          <p>评论<span>{list.length}</span></p>
        </div>
        <div className='tabs-right'>
          {
            tabs.map(item =>
              <div key={item.id} onClick={() => handleChange(item.id)} className={item.id === type ? 'active' : ''}>{item.name} <span></span></div>
            )
          }
        </div>
      </div>
      <div className='comment-wrap'>
        {/* 发表评论 */}
        <div className='comment-send'>
          <div className='avatar'>
            <img src={user.avatar} alt='' />
          </div>
          <textarea className='content' ref={inputRef} value={content} onChange={(e) => setContent(e.target.value)} placeholder='下面我简单说两句' />
          <div className='button' onClick={() => handleSend()}>发布</div>
        </div>
        {/* 评论列表 */}
        <div className='comment-list'>
          {
            list.map(item =>
              <div className='comment-item' key={item.id}>
                <div className='avatar'>
                  <img src={item.user.avatar} alt='' />
                </div>
                <div className='right'>
                  <p className='username'>{item.user.uname}</p>
                  <p className='content'>{item.content}</p>
                  <p>
                    <span className='time'>{item.time}</span>
                    <span className='like'>点赞数: {item.like}</span>
                    {item.user.uid === user.uid && <span className='delete' onClick={() => handleDel(item.id)}>删除</span>}
                  </p>
                </div>
              </div>
            )
          }
        </div>
      </div>
    </div>
  )
}