react全局的公共组件-------弹框 （Alert）

最近研究react，发现写一个组件很容易，可是要写一个全局的好像有点麻烦。不能像VUE同样，直接在原型上面扩展，注册全局组件

下面实现一个弹框，只须要引入以后，直接调用方法便可，不须要写入组件

给出我写react全局组件的思路。

建立一个 div加入到body，用这个div当容器，渲染react组件，而后由改变组件的 state来控制弹框的显示隐藏

代码结构以下：

alter.jsx

import React, { Component } from 'react';import { is, fromJS } from 'immutable';import ReactDOM from 'react-dom';import ReactCSSTransitionGroup from 'react-addons-css-transition-group';import './alert.css';  let defaultState = {  alertStatus:false,  alertTip:"提示",  closeAlert:function(){}} class Alert extends Component{   state = {    ...defaultState  };  // css动画组件设置为目标组件  FirstChild = props => {    const childrenArray = React.Children.toArray(props.children);    return childrenArray[0] || null;  }  // 关闭弹框  confirm = () => {    this.setState({      alertStatus:false    })    this.state.closeAlert();  }  open =(options)=>{    options = options || {};    options.alertStatus = true;    this.setState({      ...defaultState,      ...options    })  }  close(){    this.state.closeAlert();    this.setState({      ...defaultState    })  }  shouldComponentUpdate(nextProps, nextState){    return !is(fromJS(this.props), fromJS(nextProps)) || !is(fromJS(this.state), fromJS(nextState))  }     render(){    return (      <ReactCSSTransitionGroup        component={this.FirstChild}        transitionName='hide'        transitionEnterTimeout={300}        transitionLeaveTimeout={300}>        <div className="alert-con" style={this.state.alertStatus? {display:'block'}:{display:'none'}}>          <div className="alert-context">            <div className="alert-content-detail">{this.state.alertTip}</div>            <div className="comfirm" onClick={this.confirm}>确认</div>          </div>        </div>      </ReactCSSTransitionGroup>    );  }} let div = document.createElement('div');let props = {   };document.body.appendChild(div); let Box = ReactDOM.render(React.createElement(  Alert,  props),div);   export default Box;复制代码

alter.css

.alert-con {  position: fixed;  top: 0;  left: 0;  width: 100%;  height: 100%;  background: rgba(0, 0, 0, 0.3);  z-index: 11;}.alert-context {  background-color: #fff; border-radius: 16px; height: 200px; width: 80%; margin: 40% auto 0;}.alert-context .alert-content-detail { text-align: center; color: #333; font-size: 24px; height: 150px; line-height: 150px;}.alert-context .comfirm { border-top: 1PX solid #eee; box-sizing: border-box; height: 50px; line-height: 50px; text-align: center; font-size: 20px; color: #666;}.alert-enter { opacity: 0;}.alert-enter.alert-enter-active { transition: all 300ms; opacity: 1;}.alert-leave { opacity: 1;}.alert-leave.alert-leave-active { transition: all 300ms; opacity: 0;}复制代码

如何使用？

import React, { Component } from 'react'; import Alert from "../components/alert/alert.jsx"; class Two extends Component {    constructor(props){        super(props);        this.state = {            num:1        };    }     open=()=>{        Alert.open({            alertTip:"这是一个测试弹框",            closeAlert:function(){                console.log("关闭了...");            }        });    }  render() {    return (       <div className="Two">            Two        <button onClick={this.open}>             开启宝藏        </button>            <div>{this.state.num}</div>       </div>    );  }} export default Two;复制代码