Working with the QueryCollection Class
Both the WinJS.Utilities.query() method and the WinJS.Utilities.id() method return an instance of the QueryCollection class. The QueryCollection class derives from the base JavaScript Array class and adds several useful methods for working with HTML elements:
addClass(name)—Adds a class to every element in the QueryCollection
clearStyle(name)—Removes a style from every element in the QueryCollection
control(ctr, ...
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