What is object nodelist

"[object NodeList]"

What is represented by the above in javascript?

I am firing the onkeypress event on a textbox, which depends over the value returned by various id of related radio buttons. When I fire the alert over the id, I get the above in the开发者_StackOverflow alert box.

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[object NodeList], object means it is an object, NodeList is the interface the object implements. So it means it is a NodeList object.