Global variable is deletable?

Newsgroups	comp.lang.javascript
Date	2013-01-07 01:21 -0800
Message-ID	<95a66842-702a-416d-9575-e47c82e6667e@googlegroups.com> (permalink)
Subject	Global variable is deletable?
From	Thomas Li <cooooooder@gmail.com>

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Hi, I'm fresh in Javascript. From the book "Javascript, the definitive guide", the global variable should be nondeletable, however when I test it in IE, it is deletable, anything wrong? 
Steps:
1. Open IE 9
2. Press F12 and select Console panel
3. Var temp = 1;
   delete temp;
4. it returns true and when I enter temp, it says "temp is undefined"

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Global variable is deletable? Thomas Li <cooooooder@gmail.com> - 2013-01-07 01:21 -0800
  Re: Global variable is deletable? Stefan Weiss <krewecherl@gmail.com> - 2013-01-07 11:24 +0100
    Re: Global variable is deletable? JJ <jaejunks@nah.meh> - 2013-01-07 15:36 +0000
      Re: Global variable is deletable? Scott Sauyet <scott.sauyet@gmail.com> - 2013-01-07 07:50 -0800
    Re: Global variable is deletable? Thomas Li <cooooooder@gmail.com> - 2013-01-07 22:08 -0800
  Re: Global variable is deletable? dann90038@gmail.com - 2013-01-07 13:25 -0800
    Re: Global variable is deletable? Thomas Li <cooooooder@gmail.com> - 2013-01-07 21:48 -0800

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