react 创建单例组件的方法

import ReactDOM from 'react-dom';

/**
 * ReactDOM 不推荐直接向 document.body mount 元素
 * 当 node 不存在时，创建一个 div
 */
function domRender(reactElem, node) {
 let div;
 if (node) {
  div = typeof node === 'string'
   "htmlcode">

export class SingletonLoading extends Component {
 globalLoadingCount = 0;
 pageLoadingCount = 0;

 state = {
  show: false,
  className: '',
  isGlobal: undefined
 }

 delayTimer = null;

 start = (options = {}) => {
  // ...
 }

 stop = (options = {}) => {
  // ...
 }

 stopAll() {
  if (!this.state.show) return;
  this.globalLoadingCount = 0;
  this.pageLoadingCount = 0;
  this.setState({show: false});
 }

 get isGlobalLoading() {
  return this.state.isGlobal && this.state.show;
 }

 get noWaiting() {
  return this.noGlobalWaiting && this.pageLoadingCount < 1;
 }

 get toPageLoading() {
  return this.noGlobalWaiting && this.isGlobalLoading;
 }

 get noGlobalWaiting() {
  return this.globalLoadingCount < 1;
 }

 render() {
  return <BreakLoading {...this.state} />;
 }
}

// 使用上面的工具函数
export const loading = domRender(<SingletonLoading />);




3、使用组件：


import loading from 'xxx';

// ...
loading.start();
loading.stop();




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