这是指卸载被预览项目加载的任何资源；这并不意味着要卸载预览处理程序本身。
This refers to the unloading of any resources loaded from the item being previewed; it doesn't mean the preview handler itself is being unloaded.
用Preview视图则可运行RUI处理程序并预览结果。
You use the preview view to run the RUI handler and preview the results.
还有一种方案专门用于预览事件，即将这些事件标记为已处理，从而避免调用匹配的冒泡类处理程序。
Another scenario that is specifically for Preview events is to mark them handled so that the matching bubbling class handlers are not invoked.
应用推荐