当连接数量巨大或尺寸巨大的字符串时，数组联合是IE7和它的早期版本上唯一具有合理性能的方法。
When concatenating numerous or large strings, array joining is the only method with reasonable performance in IE7 and earlier.
当连接数量巨大或尺寸巨大的字符串时，数组联合是IE7和它的早期版本上唯一具有合理性能的方法。
When concatenating numerous or large strings, array joining is the only method with reasonable performance in IE7 and earlier.
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