Learning ActionScript 2.0 in Adobe Flash 
Learning ActionScript 2.0 in Adobe Flash |
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| Best Practices and Coding Conventions for ActionScript 2.0 > ActionScript coding conventions > About using functions > About stopping code repetition | |||
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The onEnterFrame event handler is useful because Flash can use it to repeat code at the frame rate of a SWF file. However, limit the amount of repetition that you use in a Flash file as much as possible so that you do not affect performance. For example, if you have a piece of code that repeats whenever the playhead enters a frame, it is processor intensive. This behavior can cause performance problems on computers that play the SWF file. If you use the onEnterFrame event handler for any kind of animation or repetition in your SWF files, delete the onEnterFrame handler when you finish using it. In the following ActionScript 2.0 code, you stop repetition by deleting the onEnterFrame event handler:
circleClip.onEnterFrame = function() {
circleClip._alpha -= 5;
if (circleClip._alpha<=0) {
circleClip.unloadMovie();
delete this.onEnterFrame;
trace("deleted onEnterFrame");
}
};
Similarly, limit the use of setInterval, and remember to clear the interval when you finish using it to reduce processor requirements for the SWF file.
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