react通过组件拆分实现购物车界面详解

import axios from 'axios';
import React, { Component } from 'react';
import './App.css';
import Cartfoot from './Component/Cartfoot';
import CartList from './Component/CartList';
export default class App extends Component {
  constructor() {
    super()
    this.state = {
      list: [],
      checked:false
    }
    this.getCart()
  }
  getCart = async () => {
    let res = await axios.get('http://127.0.0.1:3002/getCart')
    console.log(res.data.data);
    let carts = res.data.data
    carts.map(item => {
     return item.checked = false
    })
    this.setState({
      list: carts
    })
  }
  // 全选
  qx=(e)=>{
    let {list}=this.state
    list.map(item=>item.checked=e.target.checked)
    this.setState({
      list:list,
      checked:e.target.checked
    })
  }
  // 反选
  fx=(index)=>{
    let {list}=this.state
    list[index].checked = !list[index].checked
    this.setState({
      list:list,
      checked:list.every(item=>item.checked)
    })
  }
  // 选中删除
  checkDel=()=>{
    let {list}=this.state
    let delAll=list.filter(item=>!item.checked)
    this.setState({
      list:[...delAll]
    })
  }
  // 数量加减操作
  handlerNum=(index,type="jia")=>{
    let {list}=this.state
    type==='jia'?list[index].num++ :list[index].num--
    this.setState({
      list:list
    })
  }
  // 计算操作
  count=()=>{
    let total=0
    let nums=0
    let {list}=this.state
    list.forEach(item=>{
      if(item.checked){
        total+=item.num*item.prize
        nums+=item.num
      }
    })
    return [total,nums]
  }
  // 删除按钮
  Del=(index)=>{
    let {list}=this.state
    list.splice(index,1)
    this.setState({
      list:list
    })
  }
  render() {
    let { list ,checked} = this.state
    return (
      <div className='App'>
        <table className='table'>
          <thead>
            <tr>
              <th><input type="checkbox" checked={checked} onChange={this.qx}/></th>
              <th>ID</th>
              <th>名字</th>
              <th>图片</th>
              <th>价格</th>
              <th>数量</th>
              <th>操作</th>
            </tr>
          </thead>
          <CartList list={list} fx={this.fx} qx={this.qx} handlerNum={this.handlerNum} Del={this.Del} checked={checked}></CartList>
          <Cartfoot count={this.count} checkDel={this.checkDel}></Cartfoot>
        </table>
      </div>
    )
  }
}

import React from 'react'
import CartItem from './CartItem'
export default function CartList(props) {
  return (
    // <div>
        <tbody>
          {
              props.list.map((item, index) => {
                return (
                  <CartItem {...props} item={item} index={index} key={index}/>
                )
              })
            }
        </tbody>
    // </div>
  )
}

import React from 'react'
export default function Cartfoot(props) {
  return (
        <tfoot>
        <tr>
              <td colSpan={7}>
                商品总价格:<strong>{props.count()[0]}</strong>
                商品总数量:<strong>{props.count()[1]}</strong>
                <button onClick={props.checkDel}>选中删除</button>
              </td>
        </tr>
        </tfoot>
  )
}

import React from 'react'
import CartColltract from './CartColltract'
export default function CartItem(props) {
    let {item,index}=props
  return (
    <tr>
                    <td><input type="checkbox" checked={item.checked} onChange={()=>props.fx(index)}/></td>
                    <td>{item._id}</td>
                    <td>{item.name}</td>
                    <td><img src={item.phopo} alt="" /></td>
                    <td>{item.prize}</td>
                    <td>  
                    <CartColltract {...props} item={item} index={index}></CartColltract>
                     </td>
                    <td><button onClick={()=>props.Del(index)}>删除</button></td>
                  </tr>
  )
}

import React from 'react'
export default function CartColltract(props) {
    let {index,item}=props
  return (
    <div>
         <button className='danger' disabled={item.num === 1} onClick={()=>props.handlerNum(index,'jian')}>-</button>
                      <input type="text" value={item.num} readOnly />
                      <button onClick={()=>props.handlerNum(index,'jia')}>+</button>
    </div>
  )
}