Array的使用技巧

最新推荐文章于 2025-10-25 08:38:03 发布

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本文介绍了Array在遍历操作中的高效使用技巧，包括如何通过存储Array长度来提高循环效率，以及Array的splice方法的使用说明。

Array的使用技巧

There are many instances when you might want to loop through all the elements of an array. For example, by looping through an array containing references to sprites, you can perform a particular action on each of the sprites:

for (var i:int = 0; i < sprites.length; i++){  // Move each sprite one pixel to the right.  sprites[i].x++;}

You can store the array's length in a variable rather than computing it during each loop iteration. For example:

var length:int = sprites.length;for (var i:int = 0; i < length; i++){  // Move each sprite one pixel to the right.  sprites[i].x++;}

The effect is that there is a very marginal performance improvement because Flash doesn't have to calculate the length during each iteration. However, it assumes that you are not adding or removing elements during the loop. Adding or removing elements changes the length property. In such a case, it is better to calculate the length of the array with each iteration.

public native function splice(startIndex:int, deleteCount:uint, ... values):Array;

posted on 2010-01-04 10:51 jiahuafu 阅读(...) 评论(...) 编辑收藏