If more events occur before the event handler returns, browsers enqueue them until the event handler does return, and then process the queued events in order, one at a time, synchronously.

如果在事件处理器返回之前发生了更多的事件，浏览器就将它们放在队列中；当事件处理器返回时，依次同步地处理排队的事件，每次一个。

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In order to do this, you must add an onChange event handler to the customer widget, which modifies the order widgets query.

为了达到这个目的，您必须向客户小部件添加onchange事件处理程序，该程序将修改订单小部件查询。

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We'll see below that it is useful to define a scope as a direct child of an event handler in order to have scoped variables that are local to the event handler instance.

我们将在下面了解到，为了获得事件处理程序实例的已确定范围的局部变量，可以将活动的范围定义为事件处理程序的直接子项。

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