JavaScript如何获取panel的height值

Question

 <asp:Panel ID="Panel1" runat="server" Height="200px" ScrollBars="Auto" Width="100%"  > 
我用的
var panel=document.getElementById("<%=Panel1.ClientID%>");  
    alert(panel.Height);var panel=document.getElementById("Panel1");  
    alert(panel.Height);
显示的结果都是undefined,应该怎么获取啊?

Answer 1

alert(panel.style.height); 
或alert(panel.offsetHeight); 

Answer 2

document.getElementById("Panel1").style.height;

Answer 3

document.getElementById("Panel1").style.height;

Answer 4

    var panel=document.getElementById("<%=Panel1.ClientID%>").style.height;  
    alert(panel);