稳扎稳打Silverlight(2) - 1.0实例之支持录音和回放的钢琴(Silverlight+ASP.NET AJAX+DLINQ)

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稳扎稳打Silverlight(2) - 1.0实例之支持录音和回放的钢琴(Silverlight+ASP.NET AJAX+DLINQ)


作者:webabcd


介绍
用Silverlight 1.0实现一个可以用鼠标或键盘弹奏,并且支持录音和回放的钢琴。(Silverlight+ASP.NET AJAX+DLINQ)
参考:http://silverlight.net/community/communitygallery.aspx


示例
Piano.xaml(用Expression Blend开发)
<Canvas
        xmlns="http://schemas.microsoft.com/client/2007"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        x:Name="Piano"    
        Width="1024" Height="500">
        <Image Source="Image/bg.jpg" Height="500" Width="1024"/>

        <Image x:Name="imgC" Height="500" Width="1024" Canvas.Top="0" Source="Image/C.jpg" Opacity="0"/>
        <Image x:Name="imgC2" Height="500" Width="1024" Canvas.Top="0" Source="Image/C2.jpg" Opacity="0"/>
        <Image x:Name="imgD" Height="500" Width="1024" Canvas.Top="0" Source="Image/D.jpg" Opacity="0"/>
        <Image x:Name="imgD2" Height="500" Width="1024" Canvas.Top="0" Source="Image/D2.jpg" Opacity="0"/>
        <Image x:Name="imgE" Height="500" Width="1024" Canvas.Top="0" Source="Image/E.jpg" Opacity="0"/>
        <Image x:Name="imgF" Height="500" Width="1024" Canvas.Top="0" Source="Image/F.jpg" Opacity="0"/>
        <Image x:Name="imgF2" Height="500" Width="1024" Canvas.Top="0" Source="Image/F2.jpg" Opacity="0"/>
        <Image x:Name="imgG" Height="500" Width="1024" Canvas.Top="0" Source="Image/G.jpg" Opacity="0"/>
        <Image x:Name="imgG2" Height="500" Width="1024" Canvas.Top="0" Source="Image/G2.jpg" Opacity="0"/>
        <Image x:Name="imgA" Height="500" Width="1024" Canvas.Top="0" Source="Image/A.jpg" Opacity="0"/>
        <Image x:Name="imgA2" Height="500" Width="1024" Canvas.Top="0" Source="Image/A2.jpg" Opacity="0"/>
        <Image x:Name="imgB" Height="500" Width="1024" Canvas.Top="0" Source="Image/B.jpg" Opacity="0"/>

        <MediaElement x:Name="C" AutoPlay="false" Source="Media/C.wma"/>
        <MediaElement x:Name="C2" AutoPlay="false" Source="Media/C2.wma"/>
        <MediaElement x:Name="D" AutoPlay="false" Source="Media/D.wma"/>
        <MediaElement x:Name="D2" AutoPlay="false" Source="Media/D2.wma"/>
        <MediaElement x:Name="E" AutoPlay="false" Source="Media/E.wma"/>
        <MediaElement x:Name="F" AutoPlay="false" Source="Media/F.wma"/>
        <MediaElement x:Name="F2" AutoPlay="false" Source="Media/F2.wma"/>
        <MediaElement x:Name="G" AutoPlay="false" Source="Media/G.wma"/>
        <MediaElement x:Name="G2" AutoPlay="false" Source="Media/G2.wma"/>
        <MediaElement x:Name="A" AutoPlay="false" Source="Media/A.wma"/>
        <MediaElement x:Name="A2" AutoPlay="false" Source="Media/A2.wma"/>
        <MediaElement x:Name="B" AutoPlay="false" Source="Media/B.wma"/>

        <Canvas x:Name="pathCanvas">
                <Path x:Name="CPath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="161.666656494141" Height="272.333312988281" Canvas.Left="135.5" Canvas.Top="138.83332824707" Data="M272.66667,140 L136,330 147.33333,336 162.66667,410.66667 247.33333,410 234.66667,330.66667 278,248 254,242.66667 258.66667,200.66667 296.66667,139.33333 272.66667,140" />
                <Path x:Name="C2Path" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="91" Height="136.333319306374" Canvas.Left="263.5" Canvas.Top="105.500005066396" Data="M325.33333,106.66667 L264,202.66667 266,241.33333 307.33333,238.66667 354,138 351.33333,106.66666 326.66667,106" />
                <Path x:Name="DPath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="131" Height="274.333297729492" Canvas.Left="247.499999999999" Canvas.Top="137.499984741212" Data="M358,142.66667 L311.33333,243.33333 288.66667,246 248,330.66667 258,338 266.66667,411.33333 354,410.66665 347.33333,330.66668 374,246.66668 350,243.33336 352.66667,202.66669 378,138.00005 360.66667,140.00005" />
                <Path x:Name="D2Path" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="70.3333129882813" Height="134.333319425583" Canvas.Left="356.83334350586" Canvas.Top="107.500003457069" Data="M394.66667,108.66667 L357.33333,204 359.33333,241.33333 398,240.66667 426.66667,134.66667 425.33333,108" />
                <Path x:Name="EPath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="117.666656494141" Height="274.333343505859" Canvas.Left="358.833343505859" Canvas.Top="137.5" Data="M431.33333,140 L403.33333,245.33333 381.33333,248 359.33333,330 368.66667,339.33333 372,411.33333 458,411.33333 455.33333,331.33333 476,138 433.33333,138.66667" />
                <Path x:Name="FPath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="99.6666564941406" Height="273.666680037975" Canvas.Left="470.83334350586" Canvas.Top="138.833345949649" Data="M486.66667,140.66667 L471.33333,332 477.33333,334 476.66667,412 563.33333,411.33335 564,339.33334 570,328 560,246.66665 535.33333,243.33331 530,139.3333 486.66667,139.33329" />
                <Path x:Name="F2Path" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="51" Height="133.666656494141" Canvas.Left="534.166687011719" Canvas.Top="108.16665649414" Data="M538.66667,109.33333 L534.66667,137.33333 542,241.33333 584,240.66666 584.66667,205.33334 568,108.66667 540.66667,108.66668" />
                <Path x:Name="GPath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="111" Height="274.333343505859" Canvas.Left="570.166687011719" Canvas.Top="137.5" Data="M570.66667,248 L582.66667,336 582,411.33333 669.33333,410.66667 672.66667,332.66667 680.66667,330 655.33333,245.33333 631.33333,244 601.33333,138 578.66667,138 594.66667,244.66667 571.33333,248" />
                <Path x:Name="G2Path" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="76.3333129882813" Height="131.666656494141" Canvas.Left="603.5" Canvas.Top="110.166664123534" Data="M612,111.33333 L604,136.66667 636,238.66667 636.66667,241.33333 679.33333,241.33333 679.33333,206.66667 641.33333,111.33334 612.66667,110.66668" />
                <Path x:Name="APath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="138.333312988281" Height="274.333343505859" Canvas.Left="655.5" Canvas.Top="137.5" Data="M665.33333,246 L694.66667,336.66667 686,411.33333 774.66667,410 785.33333,335.33333 793.33333,328.66667 750.66667,246.66667 722,243.33333 673.33333,138 656,138.66667 688.66667,216.66667 685.33333,245.33333 666,246" />
                <Path x:Name="A2Path" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="95" Height="131" Canvas.Left="676.166687011719" Canvas.Top="110.833320617675" Data="M682,111.33333 L676.66667,138.66667 730.66667,240.66667 768.66667,241.33333 770.66667,204.00001 713.33333,111.33334 683.33333,111.33335" />
                <Path x:Name="BPath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="172.333312988281" Height="275.666687011719" Canvas.Left="733.5" Canvas.Top="136.833320051431" Data="M758,247.33333 L806,333.33333 790,412 878,412 894.66667,334 905.33333,327.33333 764.66667,138.66667 734,137.33333 776.66667,207.33334 778.66667,246.66668 758.66667,248" />
        </Canvas>

        <Ellipse x:Name="stopRecord"    Height="30" Width="30" Canvas.Left="40" Canvas.Top="430"
            Stroke="Black" StrokeThickness="3" Fill="Red"/>
        <Ellipse x:Name="startRecord"    Height="30" Width="30" Canvas.Left="80" Canvas.Top="430"
            Stroke="Black" StrokeThickness="3" Fill="Green"/>

        <Canvas Width="60" Height="30" Canvas.Left="760" Canvas.Top="422" Cursor="Hand">
                <TextBlock x:Name="play" TextWrapping="Wrap" FontSize="28" Foreground="#FF4C7185" Text="Play">
                </TextBlock>
        </Canvas>

        <TextBlock x:Name="lblMussicBook" TextWrapping="Wrap" Canvas.Left="120" Canvas.Top="434" FontSize="14" Foreground="#FFFFFFFF" Text="MusicBook:">
        </TextBlock>
        <TextBlock x:Name="lblName" TextWrapping="Wrap" Canvas.Left="520" Canvas.Top="434" FontSize="14" Foreground="#FFFFFFFF" Text="Name:">
        </TextBlock>
</Canvas>
 
Piano.xaml.js
if (!window.Piano)
        window.Piano = {};

Piano.Page = function()    
{
}

Piano.Page.prototype =
{
        handleLoad: function(control, userContext, rootElement)    
        {
                 this.control = control;
                
                 // Sample event hookup:        
                rootElement.addEventListener( "MouseLeftButtonDown", Silverlight.createDelegate( this, this.handleMouseDown));
        },
        
         // Sample event handler
        handleMouseDown: function(sender, eventArgs)    
        {
                 // The following line of code shows how to find an element by name and call a method on it.
                 // this.control.content.findName("Timeline1").Begin();
        }
}
 
Default.aspx
<%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Default.aspx.cs"
        Inherits="_10_Piano_Default" Title="支持录音和回放的钢琴" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">

        <script type="text/javascript" src="../Silverlight.js"></script>

        <script type="text/javascript" src="Default.aspx.js"></script>

        <script type="text/javascript" src="Piano.xaml.js"></script>

        <script type="text/javascript" src="Piano.js"></script>

        <style type="text/css">
                .silverlightHost
                {
                        height: 500px;
                        width: 1024px;
                }
        </style>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <div id="SilverlightControlHost" class="silverlightHost">

                <script type="text/javascript">
                        var txtInput = '<%= txtInput.ClientID %>';
                        var txtName = '<%= txtName.ClientID %>';
                        createSilverlight();
                </script>

                <asp:UpdateProgress ID="UpdateProgress1" runat="server">
                        <ProgressTemplate>
                                <div style="position: absolute; top: 0px; background-color: Red; color: White; z-index: 999">
                                        Loading</div>
                        </ProgressTemplate>
                </asp:UpdateProgress>
                <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                        <ContentTemplate>
                                <asp:GridView ID="GridView1" runat="server" Style="position: absolute; top: 0px;
                                        width: 1024px" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False"
                                        DataKeyNames="ID" DataSourceID="LinqDataSource1" RowStyle-HorizontalAlign="Center"
                                        PageSize="2" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
                                        <Columns>
                                                <asp:CommandField ShowSelectButton="True" HeaderText="选择" ItemStyle-Width="40px"></asp:CommandField>
                                                <asp:CommandField ShowDeleteButton="True" HeaderText="删除" ItemStyle-Width="40px"></asp:CommandField>
                                                <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True"
                                                        SortExpression="ID" ItemStyle-Width="40px"></asp:BoundField>
                                                <asp:BoundField DataField="Name" HeaderText="名称" SortExpression="Name"></asp:BoundField>
                                                <asp:TemplateField HeaderText="乐谱" SortExpression="Details" ItemStyle-Width="700px">
                                                        <ItemTemplate>
                                                                <div style="overflow: hidden; width: 666px">
                                                                        <asp:Label ID="lblDetails" runat="server" Text='<%# Bind("Details") %>'></asp:Label>
                                                                </div>
                                                        </ItemTemplate>
                                                </asp:TemplateField>
                                        </Columns>
                                </asp:GridView>
                                <asp:TextBox ID="txtInput" runat="server" Style="position: absolute; left: 200px;
                                        top: 434px; width: 300px" />
                                <asp:TextBox ID="txtName" runat="server" Style="position: absolute; left: 566px;
                                        top: 434px;" />
                        </ContentTemplate>
                        <Triggers>
                                <asp:AsyncPostBackTrigger ControlID="btnAdd" />
                        </Triggers>
                </asp:UpdatePanel>
                <asp:LinqDataSource ID="LinqDataSource1" runat="server" ContextTypeName="Data.MusicBookDataContext"
                        EnableDelete="True" TableName="MusicBook">
                </asp:LinqDataSource>
                <asp:Button ID="btnAdd" runat="server" Text="添加" Style="position: absolute; left: 710px;
                        top: 434px;" OnClick="btnAdd_Click" />
        </div>
</asp:Content>
 
Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;

public partial class _10_Piano_Default : System.Web.UI.Page
{
         protected void Page_Load( object sender, EventArgs e)
        {

        }

         protected void btnAdd_Click( object sender, EventArgs e)
        {
                Data.MusicBookDataContext mbdc = new Data.MusicBookDataContext();
                Data.MusicBook mb = new Data.MusicBook();

                mb.Name = txtName.Text;
                mb.Details = txtInput.Text;

                mbdc.MusicBook.Add(mb);
                mbdc.SubmitChanges();

                txtName.Text = "";
                txtInput.Text = "";

                GridView1.DataBind();
        }

         protected void GridView1_SelectedIndexChanged( object sender, EventArgs e)
        {
                txtName.Text = GridView1.Rows[GridView1.SelectedIndex].Cells[3].Text;
                txtInput.Text = ((Label)GridView1.Rows[GridView1.SelectedIndex].Cells[4].FindControl( "lblDetails")).Text;
        }
}
 
Default.aspx.js
function createSilverlight()
{
         var scene = new Webabcd.Piano();
        Silverlight.createObjectEx({
                source: "Piano.xaml",
                parentElement: document.getElementById( "SilverlightControlHost"),
                id: "SilverlightControl",
                properties: {
                        width: "100%",
                        height: "100%",
                        version: "1.0",
                        isWindowless: "true"
                },
                events: {
                        onLoad: Silverlight.createDelegate(scene, scene.handleLoad)
                }
        });
}


if (!window.Silverlight)    
        window.Silverlight = {};

Silverlight.createDelegate = function(instance, method) {
         return function() {
                 return method.apply(instance, arguments);
        }
}
 
Piano.js
if (!window.Webabcd)
        window.Webabcd = {};

Webabcd.Piano = function()    
{
}

Webabcd.Piano.prototype =
{
        handleLoad: function(control, userContext, rootElement)    
        {
                 // plugin(插件)
                 this.control = control;
                
                 // 根Canvas元素
                 this.rootElement = rootElement;
                
                 // object.addEventListener(eventName, functionReference)为对象添加一个事件监听器(事件名称,函数名称)
                 // Silverlight.createDelegate用来创建一个调用“this”上下文下的特定函数的委托,其被定义在runtime
                 // Silverlight.createDelegate = function(instance, method)    
                 // {
                 //     return function()    
                 //     {
                 //            return method.apply(instance, arguments);
                 //        }
                 // }
                 this.rootElement.addEventListener( "GotFocus", Silverlight.createDelegate( this, this.resetPiano));
                 this.rootElement.addEventListener( "KeyDown", Silverlight.createDelegate( this, this.handleKeyDown));
                 this.rootElement.addEventListener( "KeyUp", Silverlight.createDelegate( this, this.handleKeyUp));

                 // 鼠标热区的Canvas
                 // object.findName(name)
                 this.pathCanvas = rootElement.findName( "pathCanvas");        

                 // 开始录制按钮
                 this.startRecord = rootElement.findName( "startRecord");        
                 this.startRecord.addEventListener( "MouseLeftButtonDown", Silverlight.createDelegate( this, this.handleStartRecord));

                 // 停止录制按钮
                 this.stopRecord = rootElement.findName( "stopRecord");        
                 this.stopRecord.addEventListener( "MouseLeftButtonDown", Silverlight.createDelegate( this, this.handleStopRecord));
                
                 // 默认为选中停止录制按钮
                 // plugin.content.findName(objectName)
                document.getElementById('SilverlightControl').content.findName( "stopRecord").Stroke = "LightBlue";
                document.getElementById('SilverlightControl').content.findName( "stopRecord").StrokeThickness = 6;
                
                 // 播放按钮
                 this.play = rootElement.findName( "play");        
                 this.play.addEventListener( "MouseLeftButtonDown", Silverlight.createDelegate( this, this.handlePlay));

                 // object.children对应<Canvas>一个或多个子元素</Canvas>
                 // object.getItem(index)获取集合内指定的对象
                 // object.count集合内的成员数量
                 for( var i = 0; i< this.pathCanvas.children.count; ++i)
                {
                         // 为所有鼠标热区添加相关的事件监听器
                         this.pathCanvas.children.getItem(i).addEventListener( "MouseLeftButtonDown", Silverlight.createDelegate( this, this.handleMouseDown));
                         this.pathCanvas.children.getItem(i).addEventListener( "MouseLeftButtonUp", Silverlight.createDelegate( this, this.handleMouseUp));
                }
                
                 // 是否启用录制
                 this._enableRecord = false;
                 // 上一次按键的时间
                 this._prevTime = new Date().getTime();
        },
        
         // 单击开始录制按钮
        handleStartRecord: function(sender, eventArgs)    
        {
                 // 设置开始录制按钮样式
                sender.Stroke = 'LightBlue';
                sender.StrokeThickness = 6;
                
                 // 设置停止录制按钮样式
                document.getElementById('SilverlightControl').content.findName( "stopRecord").Stroke = "Black";
                document.getElementById('SilverlightControl').content.findName( "stopRecord").StrokeThickness = 3;
                
                 // 启用录音
                 this._enableRecord = true;
                 // 记录时间
                 this._prevTime = new Date().getTime();
        },
        
         // 单击停止录制按钮
        handleStopRecord: function(sender, eventArgs)    
        {
                 // 设置停止录制按钮样式
                sender.Stroke = 'LightBlue';
                sender.StrokeThickness = 6;

                 // 设置开始录制按钮样式
                document.getElementById('SilverlightControl').content.findName( "startRecord").Stroke = "Black";
                document.getElementById('SilverlightControl').content.findName( "startRecord").StrokeThickness = 3;

                 // 清空乐谱名称和乐谱内容
                document.getElementById(txtInput).value = '';
                document.getElementById(txtName).value = '';
                
                 // 停止录音
                 this._enableRecord = false;
        },
        
         // 单击播放按钮
        handlePlay: function(sender, eventArgs)    
        {
                 // 根据乐谱自动播放
                autoPlay( this, 0);
        },
        
         // 记录乐谱
        handleRecord: function(currentPianoKeyID)
        {
                 if ( this._enableRecord)
                {
                         // 插入乐谱
                        document.getElementById(txtInput).value += new Date().getTime() - this._prevTime + ',';
                        document.getElementById(txtInput).value += currentPianoKeyID + ';';

                         // 更新时间
                         this._prevTime = new Date().getTime();
                }
        },
        
        handleMouseDown: function(sender, eventArgs)    
        {
                 // object.captureMouse()为对象启用鼠标捕捉(鼠标离开热区也可触发相关事件,如MouseLeftButtonUp)
                sender.captureMouse();
                
                 var currentPianoKeyID = sender.name.substr(0, sender.name.indexOf( "Path"));
                 var currentImage = sender.findName( "img" + currentPianoKeyID);
                currentImage.opacity = 1;
                
                 var currentMediaElement = sender.findName(currentPianoKeyID);
                currentMediaElement.stop();
                currentMediaElement.play();
                
                 this.handleRecord(currentPianoKeyID);
        },
        
        handleMouseUp: function(sender, eventArgs)    
        {
                 // object.releaseMouseCapture()释放对象的鼠标捕捉
                sender.releaseMouseCapture();
                
                 var currentPianoKeyID = sender.name.substr(0, sender.name.indexOf( "Path"));
                 var currentImage = sender.findName( "img" + currentPianoKeyID);
                currentImage.opacity = 0;
        },

        pressKey: function (currentPianoKeyID)
        {
                 var currentImage = this.control.content.findName( "img" + currentPianoKeyID);
                currentImage.opacity = 1;
                
                 var currentMediaElement = this.control.content.findName(currentPianoKeyID);
                 // object.play()播放,object.pause()暂停,object.stop()停止
                currentMediaElement.stop();
                currentMediaElement.play();
        },

        depressKey: function (currentPianoKeyID)
        {
                 var currentImage = this.control.content.findName( "img" + currentPianoKeyID);
                currentImage.opacity = 0;
        },

        handleKeyDown: function (sender, eventArgs)
        {
                 switch (eventArgs.Key)
                {
                         // eventArgs.Key - 获取与该事件相关的键盘按键
                         case 55: this.pressKey( "C"); this.handleRecord( "C"); break;
                         case 48: this.pressKey( "C2"); this.handleRecord( "C2"); break;
                         case 53: this.pressKey( "D");     this.handleRecord( "D"); break;
                         case 33: this.pressKey( "D2"); this.handleRecord( "D2"); break;
                         case 32: this.pressKey( "E");     this.handleRecord( "E"); break;
                         case 51: this.pressKey( "F");     this.handleRecord( "F"); break;
                         case 36: this.pressKey( "F2"); this.handleRecord( "F2"); break;
                         case 31: this.pressKey( "G");     this.handleRecord( "G"); break;
                         case 37: this.pressKey( "G2"); this.handleRecord( "G2"); break;
                         case 43: this.pressKey( "A");     this.handleRecord( "A"); break;
                         case 39: this.pressKey( "A2"); this.handleRecord( "A2"); break;
                         case 42: this.pressKey( "B");     this.handleRecord( "B"); break;
                }
        },

        handleKeyUp: function (sender, eventArgs)
        {
                 switch (eventArgs.Key)
                {
                         // eventArgs.Key - 获取与该事件相关的键盘按键
                         case 55: this.depressKey( "C");     break;
                         case 48: this.depressKey( "C2"); break;
                         case 53: this.depressKey( "D");     break;
                         case 33: this.depressKey( "D2"); break;
                         case 32: this.depressKey( "E");     break;
                         case 51: this.depressKey( "F");     break;
                         case 36: this.depressKey( "F2"); break;
                         case 31: this.depressKey( "G");     break;
                         case 37: this.depressKey( "G2"); break;
                         case 43: this.depressKey( "A");     break;
                         case 39: this.depressKey( "A2"); break;
                         case 42: this.depressKey( "B");     break;
                }
        },
        
        resetPiano: function(sender, eventArgs)    
        {
                 this.depressKey( "C");
                 this.depressKey( "C2");
                 this.depressKey( "D");
                 this.depressKey( "D2");
                 this.depressKey( "E");
                 this.depressKey( "F");
                 this.depressKey( "F2");
                 this.depressKey( "G");
                 this.depressKey( "G2");
                 this.depressKey( "A");
                 this.depressKey( "A2");
                 this.depressKey( "B");
        }
}


var _obj; // Webabcd.Piano对象
var _index; // 乐谱索引
function autoPlay(obj, index)
{
        _obj = obj;
        _index = index;
        
        execAutoPlay();
}

function execAutoPlay()
{
        _obj.resetPiano();

         var str = document.getElementById(txtInput).value; // 乐谱
         var ary = str.split(';'); // 间隔时间,按键名称
        
         if (_index != 0 && typeof(ary[_index-1]) != 'undefined' && ary[_index-1] != '')
        {
                 // 按下当前乐谱索引的上一个索引的按键
                _obj.pressKey(ary[_index-1].split(',')[1]);    
        }
            
         var currentIndex = _index;        
        _index++;
        
         if ( typeof(ary[currentIndex]) != 'undefined')
        {
                setTimeout( "_obj.resetPiano();", 100)
                 // 经过当前乐谱索引的间隔时间则调用execAutoPlay()
                setTimeout( "execAutoPlay();", parseInt(ary[currentIndex].split(',')[0], 10));    
        }
}
 

OK
[源码下载]

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