How to make a custom AS3 preloader?

如何使一个自定义as3 preloader ？

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Capturing and viewing coverage information for AS3 applications in real time.

实时获取和查看AS3应用程序的覆盖率信息。

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Prior to AS3, all type information was stripped out of the code when compiled.

在as3之前，代码编译后所有类型信息都会被剥除。

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As a result, the current player has to contain both AS2 and AS3 to cause the least disruption to current services.

BBC: Your guide to the BBC Embedded Media Player

The reason for this is that we are upgrading the code in the embedded media player on News and Sport from ActionScript 2 (AS2) to ActionScript 3 (AS3).

BBC: Your guide to the BBC Embedded Media Player

We hope you can please bear with us while we make these necessary changes and we assure you that information stored on your computer is simply to allow the current transitional embedded media player to work before we release a full AS3 player in early February.

BBC: Your guide to the BBC Embedded Media Player