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¶ÔÓÚij¸öÎÊÌ⣬ÀÏÍâµÄ½âÊÍ×ÜÊǺÜÏ꾡£ºhttp://hubflanger.com/stage-resize-and-the-stagewidth-and-stageheight-properties/
Turns out that when the stage is initialized, it's stageWidth and stageHeight properties are 0 until a Stage RESIZE event is triggered. This event is dispatched when the scaleMode property of the Stage object is set to StageScaleMode.NO_SCALE and the SWF file is resized ie. when the stage is rendered by the Flash Player. So if you need to add a display object onto the stage and its positioning is dependent on the stageWidth or stageHeight properties at runtime, it’s best handled by a listener that is subscribed to the Stage RESIZE event.
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Interestingly, despite universal claim that the Flash Player behaves exactly the same on all browsers, this problem only appears in a couple of browser/plugin configurations, namely FireFox/OSX and IE/Win. And strangely, on Safari and Firefox/Win, the RESIZE event is not even dispatched on page load, and neither does the Flash Player register the stageWidth and stageHeight properties as bein
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