<script>
        $(function(){
            var button = $('button');
            var video = $('video')[0]
            console.log(video);
            console.log(button);
            button.click(  function(){
                // console.log($(this));
                if($(this).text() ==='播放'){
                    video.play()
                }
                if($(this).text() ==='暂停'){
                    video.pause()
                }
                if($(this).text() ==='切换'){
                    if(video.paused){
                        video.play()
                    }else{
                        video.pause()
                    }
                }
                if($(this).text() ==='音量+'){
                    video.volume = (video.volume>0.9?0.9:video.volume)+0.1
                }
                if($(this).text() ==='音量-'){
                    video.volume = (video.volume<0.1?0.1:video.volume)-0.1
                }
                if($(this).text() ==='快进'){
                    video.currentTime+=5;
                }
                if($(this).text() ==='回退'){
                    video.currentTime-=5;
                }
                if($(this).text() ==='倍速播放'){
                    video.playbackRate = 5;
                }
            })
            video.onvolumechange=function(){
                console.log(video.volume);
                if(video.volume>0.5){
                    alert('如果继续提高音量，会损伤耳朵！')
                }
            }
        })
    </script>
<body>
    <video src="./音视频/1.mp4" controls  poster="./音视频/长权.jpg"></video>
    <button>播放</button>
    <button>暂停</button>
    <button>切换</button>
    <button>音量+</button>
    <button>音量-</button>
    <button>快进</button>
    <button>回退</button>
    <button>倍速播放</button>
</body>

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