Toast是常用的輕提示彈框，常用於頁面loading和提示語彈窗。本例基於React實現一個隨時可呼叫且不隨頁面渲染的全域性元件。

如何使用

首先引入

import Toast from './components/toast'

JSX中事件呼叫：

<button onClick={() => { Toast.info('普通提示') }}>普通提示</button>

JS中方法呼叫：

Toast.info('普通提示')

回撥方法：

const hideLoading = Toast.loading('載入中...', 0, () => {
    Toast.success('載入完成')
})
setTimeout(hideLoading, 2000)
 

呼叫規則：3個引數：

• content 提示內容 string（loading方法為可選）
• duration 提示持續時間 number，單位ms（可選）
• onClose 提示關閉時的回撥函式（可選）

Toast.info("普通",2000)
Toast.success("成功",1000,() => {
    console.log('回撥方法')
}))
Toast.error("錯誤")
Toast.loading()

程式碼實現

目錄結構：

• index.js：對外export介面，設定預設的引數值，全域性建立或銷燬Toast的DIV。
• toast.js：Toast具體顯示的內容及多次呼叫Toast時的狀態管理。
• toast.css：Toast的樣式，費話不多說。

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 = '載入中...', 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;//僅展示最後一個提示
        
        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); } }