试试这个：http://weblogs.asp.net/joelvarty/archive/2009/07/17/resolveurl-in-javascript.aspx

  

在该网站的主页，把这个：

块引用>

 ＆LT;脚本类型=文/ JavaScript的＆GT;
        变种的baseUrl =下;％= RESOLVEURL（〜/）％＆gt;中;
＆LT; / SCRIPT＆GT;
 

  

然后，在你的JavaScript文件，把这个功能：

块引用>

 函数RESOLVEURL（URL）{
    如果（url.indexOf（〜/）== 0）{
        URL = +的baseUrl url.substring（2）;
    }
    返回URL;
}
 

  

您可能已经把在母版页功能吧，但你
  不会得到智能影音意义上为您的code的其余部分。轮到你了
  可以用〜/右从JavaScript调用RESOLVEURL。

块引用>

为什么需要这对客户方？使用servercontrols（ RUNAT =服务器），你可以用波浪来解决服务器的URL。

Well, i understand my title is a bit confusing. I will state it clearly below with the example.

<asp:ImageButton ID="imgButton" NavigateUrl="~/Presentation/Resources/Images/addFile.png" runat="server" />

In html, the control above will be rendered as

<input type="image" name="imgButton" id="imgButton" src="../../Resources/Images/addFile.png" style="border-width:0px;">

I notice that,it will convert the src from "~" to "../../" .It auto arrange it will the file level.

so in javascript, i want to set it the control with this url :

~/Presentation/Resources/Images/PDF.png

unfortunately, in html it will be rendered as

<input type="image" name="imgButton" id="imgButton" src="~/Presentation/Resources/Images/addFile.png" style="border-width:0px;">

My question is, What should i write if i wanna get the "../../" relative path with "~" ? I have tried this,but i cant get it.

<script type="javascript">
document.getElementById("<%= imgButton.ClientID %>").src = 
"~/Presentation/Resources/Images/PDF.png";
</script>

Try this: http://weblogs.asp.net/joelvarty/archive/2009/07/17/resolveurl-in-javascript.aspx

In the master page for the site, put this:

<script type="text/javascript">
        var baseUrl = "<%= ResolveUrl("~/") %>";
</script>

Then, in your javascript file, put this function:

function ResolveUrl(url) {
    if (url.indexOf("~/") == 0) {
        url = baseUrl + url.substring(2);
    }
    return url;
}

You could have put the function right in the master page, but then you wouldn’t get intelli-sense on it for the rest of your code. Now you can call ResolveUrl with ~/ right from javascript.

Why do you need this on clientside? Use servercontrols(runat=server) and you can use tilde to resolve URL on server.