Since this functionality was added at the height of the Browser Wars, Netscape and Microsoft made a distinct point of creating totally incompatibleevent models.
浏览器大战时,网景和微软实现了两个截然不同的不相容的事件模型。
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Subtle differences, incompatibleevent models, and irreconcilable DOM incompatibilities force Ajax developers into writing defensive code that deals with the differences.