Toast是常用的轻提示弹框，常用于页面loading和提示语弹窗。
本例基于React实现一个随时可调用且不随页面渲染的全局组件。
需求分析
Toast 不需要同页面一起被渲染，而是根据需要被随时调用。
Toast 是一个轻量级的提示组件，它的提示不会打断用户操作，并且会在提示的一段时间后自动关闭。
Toast 需要提供几种不同的消息类型以适应不同的使用场景。
Toast 的方法必须足够简洁，以避免不必要的代码冗余。
如何使用
首先引入
import Toast from './components/toast'
JSX中事件调用：
<button onClick={() => { Toast.info('普通提示') }}>普通提示</button>
JS中方法调用：
Toast.info('普通提示')
回调方法：
const hideLoading = Toast.loading('加载中...', 0, () => { Toast.success('加载完成') }) setTimeout(hideLoading, 2000)
调用规则：
3个参数：
content 提示内容 string（loading方法为可选）
duration 提示持续时间 number，单位ms（可选）
onClose 提示关闭时的回调函数（可选）
Toast.info("普通",2000) Toast.success("成功",1000,() => { console.log('回调方法') })) Toast.error("错误") Toast.loading()
代码实现
目录结构：
index.js：对外export接口，设置默认的参数值，全局创建或销毁Toast的DIV。
toast.js：Toast具体显示的内容及多次调用Toast时的状态管理。
toast.css：Toast的样式，费话不多说。
index.js：
import React from 'react' import ReactDOM from 'react-dom' import Toast from './toast' import './toast.css' function createNotification() { const div = document.createElement('div') document.body.appendChild(div) const notification = ReactDOM.render(<Toast />, div) return { addNotice(notice) { return notification.addNotice(notice) }, destroy() { ReactDOM.unmountComponentAtNode(div) document.body.removeChild(div) } } } let notification const notice = (type, content, duration = 2000, onClose) => { if (!notification) notification = createNotification() return notification.addNotice({ type, content, duration, onClose }) } export default { info(content, duration, onClose) { return notice('info', content, duration, onClose) }, success(content = '操作成功', duration, onClose) { return notice('success', content, duration, onClose) }, error(content, duration , onClose) { return notice('error', content, duration, onClose) }, loading(content = '加载中...', duration = 0, onClose) { return notice('loading', content, duration, onClose) } }
toast.js：
import React, { Component } from 'react' class ToastBox extends Component { constructor() { super() this.transitionTime = 300 this.state = { notices: [] } this.removeNotice = this.removeNotice.bind(this) } getNoticeKey() { const { notices } = this.state return `notice-${new Date().getTime()}-${notices.length}` } addNotice(notice) { const { notices } = this.state notice.key = this.getNoticeKey() // notices.push(notice);//展示所有的提示 notices[0] = notice;//仅展示最后一个提示 this.setState({ notices }) if (notice.duration > 0) { setTimeout(() => { this.removeNotice(notice.key) }, notice.duration) } return () => { this.removeNotice(notice.key) } } removeNotice(key) { const { notices } = this.state this.setState({ notices: notices.filter((notice) => { if (notice.key === key) { if (notice.onClose) setTimeout(notice.onClose, this.transitionTime) return false } return true }) }) } render() { const { notices } = this.state const icons = { info: 'toast_info', success: 'toast_success', error: 'toast_error', loading: 'toast_loading' } return ( <div className="toast"> { notices.map(notice => ( <div className="toast_bg" key={notice.key}> <div className='toast_box'> <div className={`toast_icon ${icons[notice.type]}`}></div> <div className='toast_text'>{notice.content}</div> </div> </div> )) } </div> ) } } export default ToastBox
toast.css:
.toast { position: fixed; left: 0; top: 0; z-index: 999; display: flex; flex-direction: column; } .toast_bg { position: fixed; width: 100%; height: 100%; left: 0; top: 0; } .toast_box { position: relative; left: 50%; top: 50%; width: 2.8rem; height: 2rem; margin: -1rem -1.4rem; background: rgba(0, 0, 0, 0.65); border-radius: .1rem; color: #fff; } .toast_text { position: absolute; bottom: 16%; text-align: center; width: 90%; margin: 0 5%; height: .28rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; } .toast_icon { position: relative; left: 50%; top: 15%; margin: -.4rem; width: .8rem; height: .8rem; } .toast_loading { -webkit-animation: loading 1s steps(12, end) infinite; animation: loading 1s steps(12, end) infinite; background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAAAM1BMVEUAAAD///////////////////////////////////////////////////////////////+3leKCAAAAEHRSTlMAENCA8KAgsGDgQMCQUDBwhylaLQAAAL1JREFUOMu9U0kSwyAMK9jsS/T/1zZt2pgEZzq9RBeMZYRGDI/70bO5JptjrOAQVTonIJVK5bW2ma9A7VvpK8OdeQfbZectrDnyU+Oo0b68wGK0muDPdxpOciaizq5pkAgiIPAoew2rBVNYZoM2YHbZDNKz/2Ogam3ff5gMEL8wisfh2KKZiFiGWFkk1B7NSbhNQFy4M2+PghbODNsg7y8THM2njiy8gBgcaEUA9GgNJbxh6fJv+NxiFvYmPAFtCQZNK1qZIAAAAABJRU5ErkJggg==") no-repeat; background-size: 100%; } .toast_success { background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAAAM1BMVEUAAAD///////////////////////////////////////////////////////////////+3leKCAAAAEHRSTlMA8DAQ0GBP4LCggMBwIJBAIttdjAAAAINJREFUOMvdkUsOwyAMBbH5hUCauf9pK1SlohF438x2LPn52f09+8vUfiNb/gighj8FouEjYCUoQDXiBSD7pdcMiK7XC9wCFmlDO3T20Scgx287ne13pwDU89NOJ3g3maCmJDANqIGRtLj8oi1ed1GMdmcB7wXIYX8QdQZJiM5Em3smbyVICDCOrCqSAAAAAElFTkSuQmCC") no-repeat; background-size: 100%; } .toast_error { background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgBAMAAACBVGfHAAAAMFBMVEUAAAD///////////////////////////////////////////////////////////87TQQwAAAAD3RSTlMA0BDAMODwUKBgsCCAQJClzVPvAAAA0UlEQVQoz2MgErAclv9o44Dgc8b/B4KvBTA+t/3XdgeWivjPG6ACbl8ngNXlp0AN+L8IwtD6DzFm2w+Y3v5sMGW/ACbA9Rms9ZsCTIApH2QR608GhoUKQJ4xA8P8AKCAP5CwF2JgUPwIlPwCFDj/AMRRYJIHCnL8AZkJ1AfkAcUYGNhBpso7MICUgBQw8H4EEv/B5ssDFYA4mAKYWjANfd+Aai3CYZ9BDoM63RDkdEGQ0zE9h+l9zADCDEIGt2/wQEZEwwVepGhgYEdEFGZUEgYAW05XI3jSsVwAAAAASUVORK5CYII=") no-repeat; background-size: 100%; } .toast_info { background: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgBAMAAACBVGfHAAAALVBMVEUAAAD///////////////////////////////////////////////////////+hSKubAAAADnRSTlMA4CCAwKBAMJBg8NAQUNhWlbcAAAC+SURBVCjPYyASsLfse+1cgOBzyr0DgocXYHwmv4dtCkwZck8UoAJZDydA1C2H8NnexUAYR99BjNF6CtMbtwhM+QUACUUhIMH6BKz14QEgafcYSPDIgSxifMkAE2CYJwAk6gQQAozPgURfA0KAA0T6JSAE2ECm7lNACDC9BhLvGGACIA6GAFyLohBEC9xQqLeeQKwFA4i1EIfBAeNzuNMVhSBOx/AcpvcxAwgzCDEDGTMaGHhhEYWIShN4VBIGAPvRT5YzufhUAAAAAElFTkSuQmCC") no-repeat; background-size: 100%; } @-webkit-keyframes loading { 0% { -webkit-transform: rotate3d(0, 0, 1, 0deg); transform: rotate3d(0, 0, 1, 0deg); } 100% { -webkit-transform: rotate3d(0, 0, 1, 360deg); transform: rotate3d(0, 0, 1, 360deg); } } @keyframes loading { 0% { -webkit-transform: rotate3d(0, 0, 1, 0deg); transform: rotate3d(0, 0, 1, 0deg); } 100% { -webkit-transform: rotate3d(0, 0, 1, 360deg); transform: rotate3d(0, 0, 1, 360deg); } }