如果您不能及早识别一个工作集，则延迟加载就是填补缓存的下一个最佳选择。
If you cannot identify a working set ahead of time, then a lazy load is the next best option for filling a cache.
您不能将事件附加到元素上，除非该元素已加载 — 但是您如何知道这什么时候发生？
You can't attach an event to an element until the element is loaded—but how do you know when that happens?
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