A summary of the properties, methods and events of the HTML5 Video tag

This article mainly introduces the attributes, methods and events of the HTML5 Video tag. This article explains

I wrote a video player based on html5 video some time ago. I didn’t understand it from the beginning. , and then be able to write a basically complete custom player. In this process, I gained a comprehensive understanding of the attributes, methods, and events of the video tag. The categories are listed below.

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The code is as follows :

src ：视频的属性
poster：视频封面，没有播放时显示的图片
preload：预加载
autoplay：自动播放
loop：循环播放
controls：浏览器自带的控制条
width：视频宽度
height：视频高度

html Code

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The code is as follows:

<video id="media" src="http://www.jb51.net/test.mp4" controls width="400px" heigt="400px"></video>  
 //audio和video都可以通过JS获取对象,JS通过id获取video和audio的对象

Get video object

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The code is as follows:

Media = document.getElementById("media");

Media methods and properties:

HTMLVideoElement and HTMLAudioElement are both inherited from HTMLMediaElement

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The code is as follows:

Media.error; //null:正常
Media.error.code; //1.用户终止 2.网络错误 3.解码错误 4.URL无效
<strong>//网络状态</strong> 
- Media.currentSrc; //返回当前资源的URL
- Media.src = value; //返回或设置当前资源的URL
- Media.canPlayType(type); //是否能播放某种格式的资源
- Media.networkState; //0.此元素未初始化 1.正常但没有使用网络 2.正在下载数据 3.没有找到资源
- Media.load(); //重新加载src指定的资源
- Media.buffered; //返回已缓冲区域，TimeRanges
- Media.preload; //none:不预载 metadata:预载资源信息 auto:</p>
<p><strong>//准备状态</strong> 
- Media.readyState;//1:HAVE_NOTHING 2:HAVE_METADATA 3.HAVE_CURRENT_DATA 4.HAVE_FUTURE_DATA 5.HAVE_ENOUGH_DATA
- Media.seeking; //是否正在seeking</p>
<p><strong>//回放状态</strong></p>
<p>Media.currentTime = value; //当前播放的位置，赋值可改变位置
Media.startTime; //一般为0，如果为流媒体或者不从0开始的资源，则不为0
Media.duration; //当前资源长度 流返回无限
Media.paused; //是否暂停
Media.defaultPlaybackRate = value;//默认的回放速度，可以设置
Media.playbackRate = value;//当前播放速度，设置后马上改变
Media.played; //返回已经播放的区域，TimeRanges，关于此对象见下文
Media.seekable; //返回可以seek的区域 TimeRanges
Media.ended; //是否结束
Media.autoPlay; //是否自动播放
Media.loop; //是否循环播放
Media.play(); //播放
Media.pause(); //暂停
<strong>//视频控制</strong></p>
<p>Media.controls;//是否有默认控制条
Media.volume = value; //音量
Media.muted = value; //静音
TimeRanges(区域)对象
TimeRanges.length; //区域段数
TimeRanges.start(index) //第index段区域的开始位置
TimeRanges.end(index) //第index段区域的结束位置
<strong>//相关事件</strong></p>
<p>  var eventTester = function(e){
     Media.addEventListener(e,function(){
         console.log((new Date()).getTime(),e)
     },false);
 }
eventTester("loadstart"); //客户端开始请求数据
eventTester("progress"); //客户端正在请求数据
eventTester("suspend"); //延迟下载
eventTester("abort"); //客户端主动终止下载（不是因为错误引起）
eventTester("loadstart"); //客户端开始请求数据
eventTester("progress"); //客户端正在请求数据
eventTester("suspend"); //延迟下载
eventTester("abort"); //客户端主动终止下载（不是因为错误引起），
eventTester("error"); //请求数据时遇到错误
eventTester("stalled"); //网速失速
eventTester("play"); //play()和autoplay开始播放时触发
eventTester("pause"); //pause()触发
eventTester("loadedmetadata"); //成功获取资源长度
eventTester("loadeddata"); //
eventTester("waiting"); //等待数据，并非错误
eventTester("playing"); //开始回放
eventTester("canplay"); //可以播放，但中途可能因为加载而暂停
eventTester("canplaythrough"); //可以播放，歌曲全部加载完毕
eventTester("seeking"); //寻找中
eventTester("seeked"); //寻找完毕
eventTester("timeupdate"); //播放时间改变
eventTester("ended"); //播放结束
eventTester("ratechange"); //播放速率改变
eventTester("durationchange"); //资源长度改变
eventTester("volumechange"); //音量改变

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