摘要：項目中經常會用到類似安卓的的控件。封裝一個這樣的組件是每個項目必須的事情。封裝完成這樣一個組件，具體使用方法如下使用方法第一步第二步需要的地方

項目中經常會用到類似安卓的toast的控件。封裝一個這樣的組件是每個項目必須的事情。

import React from "react";
import ReactDOM from "react-dom";

let seed = 0;
const now = Date.now();
function getUuid() {
  return `rcNotification_${now}_${seed++}`;
}

class Message extends React.Component {

  constructor(props) {
    super(props);
    this.state = {data: []};
    this.add = this.add.bind(this);
    this.remove = this.remove.bind(this);
  }

  add(notice) {
    console.log("msg123", "add");
    this.setState({data: [...this.state.data, notice]});
    const that = this;
    setTimeout((() => that.remove(notice.key)), 2000);
  }

  remove(key) {
    console.log("msg123", "remove");

    const temp = this.state.data.filter(item => {
      const result = item.key != key;
      return result;
    });
    this.setState({data: [...temp]});
  }

  render() {
    console.log("msg123", this.state.data);
    return (
      

        {
          this.state.data.map(item => {
            if (item.type == "success") {
              return 
{item.msg}
;
            }
            return 
{item.msg}
;
          })
        }
      
    );
  }
}

let instance;
Message.newInstance = function () {

  if (instance) {
    return instance;
  }

  const div = document.createElement("div");
  document.body.appendChild(div);
  const message = ReactDOM.render(, div);
  console.log("msg123", "newInstance");
  instance = {
    success(msg) {
      console.log("msg123", "success");
      message.add({type: "success", msg, key: getUuid()});
    },
    warning(msg) {
      console.log("msg123", "warning");
      message.add({type: "warning", msg, key: getUuid()});
    },
    component: message,
  };
  return instance;
};

export default Message;

封裝完成這樣一個組件，具體使用方法如下：

使用方法：
第一步：

componentWillMount() {
    this.message = Message.newInstance();
 }

第二步需要的地方

 this.message.success("xxx");
 this.message.warning("xxx);