我正在练习一个小项目 . 根据鼠标移动，必须启动或停止秒表 . 即，一旦鼠标在里面，然后启动秒表，否则停止 . 可能吗？

我的代码：aspx页面

<div id="Divn1" onmousemove="MyNewFunction(event)" onmouseout="ClearCoor()" style="width:99%; height:99%; border:solid;background-color:white; position:absolute;">
            <p id="Demo1"></p>
            <asp:Label ID="Label2" runat="server" Font-Size="XX-Large"></asp:Label>
            <div id="Divn2" style="width:50px;height:50px;border-radius:50%;background-color:brown; position:absolute; top:45%; margin-left:47%;">

            </div>
           <asp:scriptmanager ID="Scriptmanager1" runat="server"></asp:scriptmanager>
            <asp:UpdatePanel ID="UpdatePanel1" runat="server">
              <ContentTemplate>
                <asp:Label ID="Label1" runat="server" Font-Size="XX-Large"></asp:Label>
                <asp:Timer ID="tm1" Interval="1000" runat="server" ontick="tm1_Tick" />
              </ContentTemplate>
              <Triggers>
                <asp:AsyncPostBackTrigger ControlID="tm1" EventName="Tick" />
              </Triggers>
            </asp:UpdatePanel>

        </div>

然后是aspx.cs

public static Stopwatch sw;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            sw = new Stopwatch();
            sw.Start();
        }
    }
    protected void tm1_Tick(object sender, EventArgs e)
    {
        long milsecs = sw.Elapsed.Milliseconds;
        if (Label2.Text.Trim().Length > 0)
        {
            Label1.Text = DateTime.Now.ToString("00:ff");
        }
        sw.Stop();
        //Label1.Visible = false;
    }

谢谢

c# asp.net stopwatch