How to refer path in Javascript

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I place a Loading.aspx in the Util folder of my project, Util folder in in
the root directory.
I refer Loading.aspx in this way: ~/Util/Loading.aspx in Javascript, But it
fail to find Loading.aspx in run time.
How can I refer Loading.aspx in Javascript?
Below in the actual code:

 

[Joel Leong]

You cannot use ~ (tilde) in client-side code. You need to register this code
in code behind the grab the root folder using request object.