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HTML5 application - sample code sharing for implementing a simple player

黄舟Original: 2017-03-18 15:24:332087browse

如今HTML已经是比较热门的了，各种关于HTML5的应用程序、游戏、应用商店等也如火如荼的展开了。各大主流浏览器也纷纷开始支持HTML5标准，以备打赢新的一轮浏览器大战。

话不多说，不知道大家有没有发现，可以用比较新的版本的谷歌浏览器直接打开.mp3格式的音乐。自己可以试试：

这是用谷歌浏览器直接打开mp3文件的情况。其实，许多新的浏览器都开始支持HTML5中b97864c2e0ef2353a16c4d64c7734e92 39000f942b2545a5315c57fa3276f220标签，使得一些格式的流媒体可以摆脱对插件的依赖。下面我就以b97864c2e0ef2353a16c4d64c7734e92标签做一个简易的音乐播放器.

b97864c2e0ef2353a16c4d64c7734e92控件可以通过一些内置的JavaSceipt函数和特性进行控制，以及进行二次开发。例如load()、play()、pause()等控制音频播放的函数，paused、ended、currentTime、startTime等属性等.

对于这个简易播放器具有播放\暂停、快进、快退等功能，结合5ba626b379994d53f7acf72a64f9b697对象绘制图形

<%@language="javascript" %>
<html>
<head>
<title>PlayMusic</title>
<style type="text/css">
    p.s{position:absolute;left:100px;top:200px;width:600px;}
    audio{width:600px;position:absolute;left:0px;top:100px;}
    canvas{position:absolute;left:0px;top:40px;}
    marquee{position:absolute;left:250px;top:180px;}
    h1{color:Red;}
    h1.a{color:Green;position:absolute;left:200px;top:50px;}
</style>
</head>
<body>
<h1 class="a">欢迎使用HTML5播放器</h1>
<%
    var name = Request.QueryString("name");
    if (name == "")
        name = "";

    name1 = "save_music\\" + name + ".mp3";
    //Response.Write(name);
    
 %>
 <marquee behavior=scroll scrolldelay=200 scrollamount=30 width="300" ><h1><%=name %></h1></marquee>
 <p class="s">
 <canvas width="600" height="60" id="MusicCanvas"  onclick="dealclick()"></canvas>
<audio id="music" src=<%=name1 %> controls>
您的浏览器不支持HTML5中的audio标签
</audio>
</p>
</body>
</html>
<script type="text/javascript">
    var c = document.getElementById("MusicCanvas");
    var con = c.getContext("2d");
    var toggle = document.getElementById("music");
    drawPS();
    drawQuick();
   
    function drawPS() //flag=1表示播放命令，flag=0表示暂停
    {
        con.save();
        con.beginPath();
        var g = con.createRadialGradient(275, 30, 0, 275, 30, 25); //创建渐变颜色
        if (toggle.paused) //暂停状态
        {
            g.addColorStop(0.2, "#1FD856"); //
            g.addColorStop(0.8, "black"); //
            toggle.play();
        }
        else //播放状态
        {
            g.addColorStop(0.2, "red"); //黄
            g.addColorStop(0.8, "black"); //
            toggle.pause();
        }
        con.fillStyle = g;
        con.arc(275, 30, 25, 0, Math.PI * 2, true);
        con.fill();
        con.closePath();
        con.restore();
         
    }
    function drawQuick() //
    {
        con.save();
        con.beginPath();
        con.fillStyle = "grey";
        con.fillRect(130, 10, 70, 40);
        con.fillStyle = "black";
        con.moveTo(130, 30);
        con.lineTo(145, 13);
        con.lineTo(165, 13);
        con.lineTo(150, 30);
        con.lineTo(165, 47);
        con.lineTo(145, 47);
        con.lineTo(130, 30);
        con.fill();
        con.moveTo(160, 30); 
        con.lineTo(175, 13); 
        con.lineTo(195, 13); 
        con.lineTo(180, 30); 
        con.lineTo(195, 47); 
        con.lineTo(175, 47); 
        con.lineTo(160, 30);
        con.fill();
        con.closePath();
        con.beginPath();
        con.fillStyle = "grey";
        var x = 350;
        con.fillRect(x, 10, 70, 40);
        x += 70;
        con.fillStyle = "black";
        con.moveTo(x, 30); 
        con.lineTo(x - 15, 13); 
        con.lineTo(x - 35, 13); 
        con.lineTo(x - 20, 30); 
        con.lineTo(x - 35, 47); 
        con.lineTo(x - 15, 47); con.lineTo(x, 30);
        x -= 30;
        con.moveTo(x, 30); 
        con.lineTo(x - 15, 13); 
        con.lineTo(x - 35, 13); 
        con.lineTo(x - 20, 30); 
        con.lineTo(x - 35, 47); 
        con.lineTo(x - 15, 47); 
        con.lineTo(x, 30);
        con.fill();
        //con.moveTo(160, 40); 
        con.lineTo(175, 23); 
        con.lineTo(195, 23); 
        con.lineTo(180, 40); 
        con.lineTo(195, 57); 
        con.lineTo(175, 57); 
        con.lineTo(160, 40);
        con.fill();
        
        con.closePath();
        con.restore();
    }
    function dealclick()//处理敲击事件
    {
        var x = event.clientX;
        var y = event.clientY;
        var flag = getPos(x, y);
        //alert(x.toString() + "  " + y.toString()+"  "+flag.toString());
        if(flag==0)
        return;
    switch (flag)//
    {
        case 1: drawPS(); break;
        case 2: quickOrslow(0); break;
        case 3: quickOrslow(1); break;
    }
    }
    function getPos(x, y) //
    {
       var px=100;
       var py=240;
       x-=px;
       y-=py;
       if (x >= 275 && x <= 325 && y >= 15 && y<= 65)
           return 1;
       if (x >= 130 && x <= 200 && y >= 20 && y <= 60)
           return 2;
       if (x >= 350 && x <= 420 && y >= 20 && y <= 60)
           return 3;
       return 0;
   }
   function quickOrslow(flag) //
   {
       var total = toggle.duration;
       var s = Math.ceil(total*0.05);
       if (flag == 1)//kuaijin
       {
           if (toggle.ended == true)
               return;
           var now = toggle.currentTime;
           if (total - now <= s)
               return;
           else
               toggle.currentTime = now + s;
       }
       else  //后退
       {
           var n = toggle.currentTime;
           if (n < s)
               return;
           else
               toggle.currentTime = n - s;
       }
   }

</script>

这是全部的源代码，当然其中包含了一些ASP语句，适用于传递歌曲名的，可以不用考虑。

drawPS()是控制播放与暂停的函数,quickOrSlow()是控制快退的函数。

     当然这个播放器是非常简陋的，但是通过加工美化，还是可以做出优秀的播放器的，而且是没有插件的。

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