react-路留言板（封装组件button）

在index.js

import React from 'react'
import ReactDom from 'react-dom'

import ToDoList from './components/ToDoList'

// import './assets/css/base.css';//全局引入 优化

ReactDom.render(
  <ToDoList title="bmw" />,
  document.querySelector('#app'),
  ()=>console.log('render is over!!!')
);

在todolist

import React from "react";
import UcButton from "./UcButton";

class ToDoList extends React.Component{

  constructor(props){
    super(props);

    this.state={ //响应式
      name:'',
      content:'',
      list:[
        // {id:1,name:'alex',content:'alex123'}
      ]
    };
  }

  // timer = null;//非响应式

  send = () => {
    this.setState({
      list:this.state.list.concat({
        id:this.state.list.length+1,
        name:this.state.name,
        content:this.state.content
      }),
      name:'',
      content:''
    })
  };

  del = (index,id) => {
    //利用id -》 兜库->res success ↓
    this.state.list.splice(index, 1);
    this.setState({list:this.state.list})
  };

  check = (index,id) => {
    this.state.list[index].content='bmw';
    this.setState({list:this.state.list})
  };

  clear = () => {
    this.setState({list:[]})
  };

  changeIpt = (ev) => {
    this.setState({[ev.target.name]:ev.target.value})
  }

  render(){
    let {list,name,content} = this.state
    return (
      <div>
        <h3>留言板</h3>
        <input
          type="text"
          value={name}
          name="name"
          onChange={this.changeIpt}
        />
        <br/>
        <input
          type="text"
          value={content}
          name="content"
          onChange={this.changeIpt}
        />
        <br/>

        <UcButton text="提交交" clickHandler={this.send} />

        <br/>
        <ul>
          {
            list.map((item,index)=>(
              <li key={item.id}>
                <span>{item.content}</span>
                ---
                <em>{item.name}</em>
                ---
                <a href="javascript:;" onClick={this.del.bind(null,index,item.id)}>删除</a>
                <a href="javascript:;" onClick={()=>this.check(index,item.id)}>修改</a>
              </li>
            ))
          }
        </ul>
        {
          this.state.list.length !== 0
          &&
          <UcButton text={'清空情况'} clickHandler={this.clear} mode="warning" />
        }

      </div>
    )
  }
}

export default ToDoList

在button内

import React,{Component} from 'react';
import propTypes from 'prop-types'

import './assets/css3/uc-button.css';//全局

class UcButton extends Component{
  render(){
    return (
      <input
        // className="s1 s2"
        className={`s2 button--` + this.props.mode}
        type="button"
        value={this.props.text}
        onClick={this.props.clickHandler}
      />
    )
  }
}

UcButton.defaultProps = {
  text:'按钮',
  mode:'primary'
};

UcButton.propTypes = {
  text:propTypes.string,
  mode:propTypes.string,
  clickHandler: propTypes.func.isRequired
};

export default UcButton

在css内

.s1{
  background: red;
}
.s2{
  border: 1px slategray solid;
}

.button--primary{
  background: cornflowerblue;
}
.button--warning{
  background: bisque;
}