Canceling the event chain for the keyboard event by setting the cancelBubble property on the EVENT object to true
将 EVENT 对象的 cancelBubble 属性设置为 true，取消键盘事件的事件链
This event's position in the event chain makes it very important for binding child controls to data sources or for setting a form property that can be inherited by all child controls.
这个事件在事件链结中的位置，使得将子控制项系结至资料来源，或设定可由所有子控制项继承的表单属性变得非常重要。
It is as if a singleunimportant event set up a chain of reactions.
好像是一件无关紧要的小事引起了一连串的连锁反应。
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