confirm方法组件

App.js

import React, { Component } from 'react'
import confirm from './confirm.js'

class App extends Component {
  render() {
    return (
      <div>
        <p>lorem lorem lorem lorem lorem lorem lorem</p>
        <p>lorem lorem lorem lorem lorem lorem lorem</p>
        <p>lorem lorem lorem lorem lorem lorem lorem</p>
        <p>lorem lorem lorem lorem lorem lorem lorem</p>
      </div>
    )
  }

  async componentDidMount(){
    let res = await confirm("确定删除吗")
    console.log('did mount')
    console.log(res)
    if(res) {
      console.log("是")
    } else {
      console.log("否")
    }
  }
}

export default App

confirm.js

import React, { Component } from 'react'
import PropTypes from 'prop-types'
import ReactDOM from 'react-dom'
import './index.css'

class Modal extends Component {
  static propTypes = {
    content: PropTypes.string,
    onOk: PropTypes.func,
    onCancel: PropTypes.func
  }
  render() {
    const {
      content,
      onOk,
      onCancel
    } = this.props
    return (
      <div className="modal-wrapper">
        <div className="modal">
          <div className="modal-title">提示</div>
          <div className="modal-content">{content}</div>
          <div className="modal-operator">
            <button className="modal-operator-close" onClick={onCancel}>取消</button>
            <button className="modal-operator-confirm" onClick={onOk}>确定</button>
          </div>
        </div>
        <div className="mask"></div>
      </div>
    )
  }
}

let node = null

const hideModal = (node) => {
  ReactDOM.unmountComponentAtNode(node)
  document.body.removeChild(node)
}

const confirm = (content) => {
  return new Promise((resolve, reject) => {
    node = document.createElement('div')
    document.body.appendChild(node)
    let element = (
      <Modal
        content={content}
        onOk={
          () => {
            resolve(true)
            hideModal(node)
          }
        }
        onCancel={
          () => {
            resolve(false)
            hideModal(node)
          }
        }
      />
    )
    ReactDOM.render(element, node)
  })
}

export default confirm

index.css

.modal {
  position: fixed;
  width: 300px;
  height: 200px;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  border-radius: 5px;
  background: #fff;
  overflow: hidden;
  z-index: 9999;
  box-shadow: inset 0 0 1px 0 #000;
}

.modal-title {
  width: 100%;
  height: 50px;
  line-height: 50px;
  padding: 0 10px;
}

.modal-content {
  width: 100%;
  height: 100px;
  padding: 0 10px;
}

.modal-operator {
  width: 100%;
  height: 50px;
}

.modal-operator-close, .modal-operator-confirm {
  width: 50%;
  border: none;
  outline: none;
  height: 50px;
  line-height: 50px;
  opacity: 1;
  border-top: 1px solid #d9d9d9;
  color: rgba(0,0,0,0.65);
  background: #fff;
  cursor: pointer;
}

.modal-operator-confirm {
  border-top: 1px solid #1890ff;
  color: #fff;
  background: #1890ff;
}

.modal-operator-close:active, .modal-operator-confirm:active {
  opacity: .6;
  transition: opacity .3s;
}

.mask {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.45);
  z-index: 9998;
}