问题：

1.ios的小程序测试没问题，看完视频再次点击视频就在上一次看到的位置
2.但是安卓第一次进去会在上一次位置，返回上一页再点击视频进去就从头开始
原因：
找了好久是 videoId的问题 ,我写的videoId = 'myVideo' ，因为我把创建并返回 video 上下文 videoContext 对象里的videoId，与seek的存本地的时候要用到唯一id写的是同一个，导致我看第一个视频是五秒，第二个视频也是五秒，我以为是videoId 不是唯一，导致每个视频播放都是同一位置，我就把videoId =id + mainIdGenerator来确保唯一性，这个时候看ios，确实没啥毛病了，问题都解决了，当我打开安卓端的小程序就出现问题了，就是如上问题【第一次进去会在上一次位置，返回上一页再点击视频进去就从头开始】，其实是data return设置videoId =“”,在onload拿到id赋值给videoId导致就是视频都播放后videoId 才赋值成功，自然就从0开始播放【我自己的项目写的是这样，如有理解错误可以告诉我，都是小白~~】

解决：
其实视频上下videoId 可以不唯一，但是seek到具体位置，这里存本地的时候要用到唯一id
但uni.createVideoContext(this.myVideo, this);this.myVideo只要 在当前页面唯一就可以了，你返回之后页面会被卸载的

      this.myVideo = "myVideo"this.videoId = id + mainIdGenerator;uni.getStorageSync(`play-duration-${this.videoId}`)this.videoContext = uni.createVideoContext(this.myVideo, this);

this.myVideo用于uni.createVideoContext
this.videoId用于存储播放时间 uni.getStorageSync(play-duration-${this.videoId})

<template><view class="courseVideo"><view class="videoimage"><video:id="videoId":src="videoUrl":controls="true"looppreloaddirection="90"objectFit="fill":fullscreen="false"show-mute-btnvslide-gesture-in-fullscreen:enable-progress-gesture="true":enable-play-gesture="true":show-center-play-btn="true":show-loading="true"@timeupdate="onTimeUpdate"@play="beginPlay"@ended="onVideoPlayEnd"@canplay="oncanplay"@pause="onPause"><cover-view class="speed" v-if="fullscreen"><cover-view @click="speedNum = true" class="doubleSpeed">倍速</cover-view></cover-view><cover-viewv-if="speedNum"class="speedModal":style="{ height: videoWidth + 16 + 'px' }"@click.stop="speedNum = false"><cover-view@click="speedNum = true"class="doubleSpeed":style="{ height: videoWidth + 16 + 'px' }">1.0x</cover-view><cover-view class="speedNumBox"><cover-view@click.stop="handleSetSpeedRate(0.5)":class="[0.5 == speedRate ? activeClass : errorClass, 'number']">0.5x</cover-view><cover-view@click.stop="handleSetSpeedRate(1)":class="[1 == speedRate ? activeClass : errorClass, 'number']">1.0x</cover-view><cover-view@click.stop="handleSetSpeedRate(1.25)":class="[1.25 == speedRate ? activeClass : errorClass, 'number']">1.25x</cover-view><cover-view@click.stop="handleSetSpeedRate(1.5)":class="[1.5 == speedRate ? activeClass : errorClass, 'number']">1.5x</cover-view><!-- <cover-view@click.stop="handleSetSpeedRate(2.0)":class="[2.0 == speedRate ? activeClass : errorClass, 'number']">2.0x</cover-view> --></cover-view></cover-view></video></view></view>
</template><script>
export default {data() {return {tabs: [{name: "11",id: 1,value: "comment",},],currentTab: 0,videoUrl:'',videoContext: null,videoCurrentTime: 0,currentTime: 0,duration: 0,playStatus: false,videoId: '',myVideo:"myVideo"};},onLoad(e) {let {id,hrefcourse,mainIdGenerator,} = e;this.$nextTick(() => {this.myVideo = "myVideo"this.videoId = id + mainIdGenerator;this.videoUrl = hrefcoursethis.videoContext = uni.createVideoContext(this.videoId, this);console.log(this.videoContext, 'videoContext');const playbackTimes = uni.getStorageSync(`play-duration-${this.videoId}`);console.log(playbackTimes, 'playbackTimes');// 在视频加载时从本地存储中读取已保存的播放时间if (playbackTimes) {if (this.status == "false" && this.isExist == "false") {//说明第一次播放初始化，或者就是重修视频初始化this.videoContext.seek(0);} else {this.videoCurrentTime = Math.round(playbackTimes);this.videoContext.seek(Math.round(playbackTimes));}}});},methods: {onTimeUpdate(event) {console.log('播放中', event.target.currentTime);this.currentTime = event.target.currentTime; // 视频观看的长度this.duration = event.target.duration; // 视频总时长uni.setStorageSync(`play-duration-${this.videoId}`, this.currentTime);if (!this.playStatus) {const number = Math.abs(this.currentTime - this.videoCurrentTime);if (number.toFixed(3) > 2) {const nowtime = this.videoCurrentTime.toFixed(0);this.videoContext.seek(Number(nowtime));} else {this.videoCurrentTime = this.currentTime;}console.log('第一个播放一次了yin');}},//防作弊功能:就是播放中每五分钟弹框提醒一次，当退出页面，暂停页面，满五分钟等都会重新计时startReminderTimer() {//防作弊功能，每五分钟提醒一次// console.log(this.status, this.status);if (this.status == "false" && this.isCheat) {this.timerValue = setTimeout(() => {this.videoContext.pause();showConfirmVideo(this.$t("pages.course.You_have_watched_for_5_minutes_Click_OK_to_continue_playing"),this.$t("pages.course.note"),this.$t("common.button.cancel"),this.$t("common.button.confirm")).then((res) => {if (res.confirm) {if (this.timerValue) {clearTimeout(this.timerValue); // 清除计时器this.videoContext.play();}} else {this.videoContext.pause();}});}, 5 * 60 * 1000); //5* 60 *1000}},// 清除定时器clearReminderTimer() {if (this.timerValue) {clearTimeout(this.timerValue); // 清除计时器}},//监听播放结束onVideoPlayEnd() {this.isSeekable = true; // 播放结束后恢复滑动状态this.loadingStatus = false; //就是没有播放只是初始化完返回不调用接口this.playStatus = true; //记录播放的状态 || 播放完毕的状态让进度条重置为0this.endTime = Date.now(); // 记录视频播放结束的时间uni.setStorageSync(`${this.endTimeKey}-${this.id}`, this.endTime);console.log("结束了", this.endTime);//播放结束掉视频插入接口// this.VideoProgress(this.playStatus);this.clearReminderTimer();},//监听播放状态beginPlay() {this.loadingStatus = false;this.startTime = Date.now(); // 记录视频开始播放的时间uni.setStorageSync(`${this.startTimeKey}-${this.id}`, this.startTime);// console.log("playStatus开始了", this.startTime);this.startReminderTimer();},  oncanplay() {console.log("暂停了等待中load");this.clearReminderTimer();},onPause() {//暂停了console.log("暂停了");this.clearReminderTimer();}, //掉后端插入接口告诉后端看了多少秒VideoProgress(){},//设置倍速速度handleSetSpeedRate(rate) {// const videoContext = uni.createVideoContext("videoId");const videoContext = uni.createVideoContext(this.videoId);// console.log(videoContext, "console.log(videoContext);");videoContext.playbackRate(rate);this.speedRate = rate;this.speedNum = false;},swichMenu(id) {this.currentTab = id;this.tabCurrent = "tabNum" + id;},},onUnload() {this.videoContext = null;this.videoId = null;},
};
</script>