HTML5 audio API事件

2021-07-21 06:31:32

audio API 事件

play() 视频播放

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>

    <input type="button" value="播放" id="ipt">
    
    <script>
        var myaudio=new Audio();
        myaudio.src="data/imooc.mp3";

        ipt.onclick=function(){
            myaudio.play();
        }
    </script>
</body>
</html>

pause() 暂停

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>

    <input type="button" value="播放" id="ipt">
    <input type="button" value="暂停" id="pau">

    <script>
        var myaudio=new Audio();
        myaudio.src="data/imooc.mp3";

        ipt.onclick=function(){
            myaudio.play();
        }
        pau.onclick=function(){
            myaudio.pause();
        }
    </script>
</body>
</html>

duration 返回音频总长度

canplay 音频加载完毕，可以播放

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>

    <input type="button" value="播放" id="ipt">
    <input type="button" value="暂停" id="pau">
    <br>
    <br>
    时长：<p id="dura"></p>

    <script>
        var myaudio=new Audio();
        myaudio.src="data/imooc.mp3";

        ipt.onclick=function(){
            myaudio.play();
        }
        pau.onclick=function(){
            myaudio.pause();
        }
        myaudio.addEventListener("canplay",function(){
            dura.innerHTML=myaudio.duration;
        })

    </script>
</body>
</html>

currentTime 设置和获取音频的当前播放长度

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>

    <input type="button" value="播放" id="ipt">
    <input type="button" value="暂停" id="pau">
    <br>
    <br>
    时长：<p id="dura"></p>
    当前时长：<p id="curT"></p>

    <script>
        var myaudio=new Audio();
        myaudio.src="data/imooc.mp3";

        ipt.onclick=function(){
            myaudio.play();
        }
        pau.onclick=function(){
            myaudio.pause();
        }

        myaudio.addEventListener("canplay",function(){
            dura.innerHTML=myaudio.duration;
        })

        // 设置或返回音频长度
        myaudio.currentTime=20;
        setInterval(function(){
            curT.innerHTML=myaudio.currentTime;
        },100)

    </script>
</body>
</html>

volume 设置声音

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>

    <input type="button" value="播放" id="ipt">
    <input type="button" value="暂停" id="pau">
    <br>
    <br>
    时长：<p id="dura"></p>
    当前时长：<p id="curT"></p>

    <script>
        var myaudio=new Audio();
        myaudio.src="data/imooc.mp3";

        // 设置声音
        // 加不加引号都可以，范围在0-1
        myaudio.volume=0.5;
        myaudio.volume=‘0.5‘;

    </script>
</body>
</html>

audio API事件2

currentSrc 返回当前地址

不能设置，只能获取

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>

    <input type="button" value="播放" id="ipt">
    <input type="button" value="暂停" id="pau">
    <br>
    <br>
    时长：<p id="dura"></p>
    当前时长：<p id="curT"></p>

    <script>
        var myaudio=new Audio();
        myaudio.src="data/imooc.mp3";

        myaudio.addEventListener("canplay",function(){
            console.log(myaudio.currentSrc);
        })
    </script>
</body>
</html>

ended 音频是否结束，返回布尔值

一般用于状态监听

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>

    <input type="button" value="播放" id="ipt">
    <input type="button" value="暂停" id="pau">
    <br>
    <br>
    时长：<p id="dura"></p>
    当前时长：<p id="curT"></p>

    <script>
        var myaudio=new Audio();
        myaudio.src="data/imooc.mp3";

        myaudio.addEventListener("ended",function(){
            console.log("音频播放结束");
            console.log(myaudio.ended);
        })
    </script>
</body>
</html>

loop 设置音频循环

true表示循环，false表示不循环

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>

    <input type="button" value="播放" id="ipt">
    <input type="button" value="暂停" id="pau">
    <br>
    <br>
    时长：<p id="dura"></p>
    当前时长：<p id="curT"></p>

    <script>
        var myaudio=new Audio();
        myaudio.src="data/imooc.mp3";

        myaudio.loop=true;
    </script>
</body>
</html>

playbackRate 音频倍速

默认为1

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>

    <input type="button" value="播放" id="ipt">
    <input type="button" value="暂停" id="pau">
    <br>
    <br>
    时长：<p id="dura"></p>
    当前时长：<p id="curT"></p>

    <script>
        var myaudio=new Audio();
        myaudio.src="data/imooc.mp3";

        console.log(myaudio.playbackRate);
        myaudio.playbackRate=10;

    </script>
</body>
</html>

timeupdate 音频播放状态

我测试的时候发现点击了暂停，依然会执行一次音频播放中

音频刚开始还没播放的时候不会执行

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>

    <input type="button" value="播放" id="ipt">
    <input type="button" value="暂停" id="pau">
    <br>
    <br>
    时长：<p id="dura"></p>
    当前时长：<p id="curT"></p>

    <script>
        var myaudio=new Audio();
        myaudio.src="data/imooc.mp3";

        myaudio.addEventListener("timeupdate",function(){
            console.log("音频播放中...");
        })


    </script>
</body>
</html>

controls 默认控件显示

<audio src="data/imooc.mp3" controls></audio>

不同浏览器效果有区别

seeked 音频拖动完成

seeking 音频正在拖动

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>

    <audio src="data/imooc.mp3" controls id="myaudio"></audio>

    <p>seeked:<span id="seekedNum"></span></p>
    <p>seeking:<span id="seekingNum"></span></p>

    <script>

        var seekedN=seekingN=0;
        myaudio.addEventListener("seeked",function(){
            console.log("seeked");
            seekedN++;
            seekedNum.innerHTML=seekedN;
        })
        myaudio.addEventListener("seeking",function(){
            console.log("seeking");
            seekingN++;
            seekingNum.innerHTML=seekingN;
        })


    </script>
</body>
</html>

volumechange 声音改变事件

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>
    <audio src="data/imooc.mp3" controls id="myaudio"></audio>

    <script>
        myaudio.addEventListener("volumechange",function(){
            console.log("声音改变了");
        })

    </script>
</body>
</html>

audio API事件4

requestFullScreen 全屏

有浏览器前缀

注意只有在HTML里创建的audio标签才可以全屏

自己在js里创建的audio对象不可以全屏

话说回来audio的全屏是 requestFullScreen

video的全屏是 requestFullscreen

两个大小写居然不是一致的，很迷……

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>
    <audio src="data/imooc.mp3" controls id="myaudio"></audio>
    <button id="btn">全屏</button>

    <script>
        btn.onclick=function(){
            myaudio.webkitRequestFullScreen();//可以全屏
        }

    </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>
    <!-- <audio src="data/imooc.mp3" controls id="myaudio"></audio> -->
    <button id="btn">全屏</button>

    <script>
        var audio=new Audio();
        
        btn.onclick=function(){
            audio.webkitRequestFullScreen();//可以全屏
        }

    </script>
</body>
</html>

不过想想也是，控件都没有，还扯什么全不全屏……

load 音频重新加载，页面不刷新

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>
    <audio src="data/imooc.mp3" controls id="myaudio"></audio>
    <button id="btn">重新加载</button>

    <script>

        btn.onclick=function(){
            myaudio.load();
        }

    </script>
</body>
</html>

另外，替换src属性也能起到重新加载的效果

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>audio</title>
    <style>
        audio{
            width:500px;
        }
    </style>
</head>
<body>
    <audio src="data/imooc.mp3" controls id="myaudio"></audio>
    <button id="btn">重新加载</button>

    <script>

        btn.onclick=function(){
            myaudio.src="data/imooc.mp3";
            //myaudio.load();
        }

    </script>
</body>
</html>

因此，想要实现重新加载的效果，有两种方法：

一种是load

一种是替换src属性

HTML5 audio API事件

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