Use developer tools in IE,Chrome,Firefox.
You can just hover over the variable names and it'll give you the current values.
For firefox use the add-on Firebug.
For Safari use inspect element.
Also you can use debugger within your code.
In Visual studio,look in the "Debug" menu for the "Step Over"[F10] and "Step Into"[F11] items.
Also you can refer to the below links for more information
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