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- n. 处理者；管理者；拳击教练；（犬马等的）训练者
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1. It provides an event handler for each menu option.
它为每一个菜单选项提供事件处理程序。
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2. This, in turn, determines whether the event should be propagated to the next handler.
而这又决定了是否应该将事件传送到下一个处理程序。
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3. To see why, imagine you have a button in your application. You want to do some work when the button is clicked, so you add an event handler to it.
为了了解原因，您可以设想应用程序上有一个按钮，单击按钮时要做一些工作， 于是您对它添加了一个事件处理程序。
- handler (n.) late 14c., "one who handles" anything, agent noun from handle (v.). Specific sense of "one engaged in trade" is from 1690s; that of "prizefighter's assistant" (1916) was earlier used in reference to dogfights and cockfights (1825).
hand·ler / ˈhændlə(r) ; NAmE ˈhændlər / noun ( especially in compounds 尤用于构成复合词 ) 1 a person who trains and controls animals, especially dogs 驯兽员；（尤指）驯犬员 2 a person who carries or touches sth as part of their job 搬运工；操作者 ◆ airport baggage handlers 机场行李员 ◆ food handlers 食品处理者 3 ( especially NAmE) a person who organizes sth or advises sb 组织者；顾问 ◆ the President's campaign handlers 总统的竞选智囊 handler handlers hand·ler / ˈhændlə(r) ; NAmE ˈhændlər /
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