DOM Event 规范
DOM Event 主要定义了三类接口:
EventTarget, 所有DOM 节点 都实现EventTarget接口
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class EventTarget {
void addEventListener(in DOMString type,in EventListener listener, in boolean useCapture);
void removeEventListener(in DOMString type, in EventListener listener, in boolean useCapture);
boolean dispatchEvent(in Event event)
};
EventListener, 用户实现该接口,并且在一个EventTarget上注册,使用addEventListener 完成注册;
void handleEvent(in Event evt);......
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