网站的栏目和版块设计的原则什么是关键词推广

前言

最近使用videojs作为视频处理第三方库，用来对接m3u8视频类型。这里总结一下自定义组件遇到的问题及实现，目前看了许多文章也不全，官方文档写的也不是很详细，自己摸索了一段时间陆陆续续完成了，这是实现后的效果.

样式啥的自己检查后覆盖就行了，没啥说的，重点看看画质切换这个组件如何实现的。最开始我是采用函数组件直接嵌入进去，后面发现是报错的，原因是hook使用范围有误，找了半天也不知道是什么原因。后面采用继承Videojs内的menu组件来实现。

代码实现

option配置如下

 const options: any = {controls: true,preload: 'auto',language: 'zh-CN',width: 854,height: 480,playbackRates: [0.5, 0.75, 1, 1.5, 2], // 倍速数组controlBar: {children: {PlayToggle: true,CurrentTimeDisplay: true,DurationDisplay: true,ProgressControl: true,Quality: true,PlaybackRateMenuButton: true,volumePanel: {inline: false,},PictureInPictureToggle: true,FullscreenToggle: true,},},}

video组件

import { ForwardedRef, forwardRef, useEffect, useImperativeHandle, useRef } from 'react'
import videojs from 'video.js'
import Quality from './quality'import './index.less'interface videoComProps {videoOptions: anyonReady: (player: any) => voidsrc?: string
}const VideoWrapper = (props: videoComProps, ref: ForwardedRef<any>) => {const { videoOptions, onReady, src } = propsconst videoRef = useRef<any>(null)const playerRef = useRef<any>(null)function toggleTv(obj: any) {const player = playerRef?.currentif (!player) returnplayer.src(obj.src)player.load(obj.load)player.play()}useEffect(() => {if (!playerRef?.current && videoRef.current) {// 注册组件  一定要在使用之前注册哦videojs.registerComponent('Quality', Quality as any)// 初始化videoconst player = (playerRef.current = videojs(videoRef.current, videoOptions, () => {onReady(player)}))}}, [videoRef])useEffect(() => {const player = playerRef.currentreturn () => {// 组件销毁的时候，销毁视频播放器的实例if (player && !player.isDisposed()) {player.dispose()playerRef.current = null}}}, [playerRef])// ref抛出变量useImperativeHandle(ref, () => ({toggleTv,}))return (<div className="video-wrapper"><videoref={videoRef}className="video-js vjs-big-play-centered"><source src={src} />{/* <span>视频走丢了，请稍后再试</span> */}</video></div>)
}export default forwardRef(VideoWrapper)

自定义组件

// 切换视频清晰度代码
import videoJs from 'video.js'
import { createRoot } from 'react-dom/client'// 初始化清晰度按钮
const TextTrackMenuItem: any = videoJs.getComponent('TextTrackMenuItem')
const TrackButton: any = videoJs.getComponent('TrackButton')
const videoQuality = '超清,高清,自动'class QualityTrackItem extends TextTrackMenuItem {constructor(player: any, options: any) {super(player, options)this.mount = this.mount.bind(this)player.ready(() => {this.mount()})this.on('dispose', () => {this.root.unmount()})if (options.index === 2) {this.addClass('vjs-selected')}}// 切换高清播放源，this 指向被点击QualityTrackItem实例handleClick(event: any) {// 先将所有选项的选中状态设为未选中this.parentComponent_.children_.forEach((c: any) => {c.selected(false)})// 选中当前this.selected(true)// 选中后修改按钮文本const btn = document.querySelector('.vjs-menu-button .vjs-icon-placeholder')if (!btn) returnbtn.innerHTML = this.track.label// 其他逻辑 通知修改视频源地址进行切换console.log('切换视频源')}mount() {this.root = createRoot(this.el()).render(<div>{this.track.label}</div>)}
}
// 扩展基类，实现菜单按钮
class QualityTrackButton extends TrackButton {constructor(player: any, options: any) {super(player, options)this.controlText('画质选择')this.children()[0].el().firstElementChild.innerText = '自动'this.addClass('vjs-quality')}createItems() {const qualityKeyArray = videoQuality.split(',')if (qualityKeyArray.length > 0) {const result: any = []qualityKeyArray.forEach((key, index: number) => {result.push(new QualityTrackItem(this.player_, {track: {label: key,value: key,},selectable: true,index,}))})return result} else {return []}}
}export default QualityTrackButton

可能遇到的问题

1.卸载不了对应事件

  const handleUpdate = useCallback(() => {const player = playerRef.current//window.document.fullscreenElement检测视频是否正在全屏// console.log('播放中，当前时间是', player.currentTime())if (player.currentTime() > 10) {if (window.document.fullscreenElement) {// 如果是全屏 退出全屏window.document.exitFullscreen()}player.currentTime(10)setOverlay(true)player.pause()}}, [])useEffect(() => {if (!playerRef?.current && videoRef.current) {// 注册组件  一定要在使用之前注册哦videojs.registerComponent('Quality', Quality as any)// 初始化videoconst player = (playerRef.current = videojs(videoRef.current, videoOptions, () => {onReady(player)}))playFlag && player.on('timeupdate', handleUpdate)}}, [videoRef])// 加入学习const handelAddLearn = () => {const player = playerRef.currentplayer.off('timeupdate', handleUpdate)setPlayFlag(false)setOverlay(false)player.play()}

把对应需要卸载的事件采用useCallback进行处理，这样的事件的地址就不会变化造成卸载失效的问题

END

希望能帮到正在开发的伙伴们