事件的传播阶段。
>当元素接收事件时,事件从面板根元素到目标元素传播。
在 TrickleDown 阶段中,事件从面板的根元素发送到目标元素的父级。
在 AtTarget 阶段中,事件发送到目标元素。
在 BubbleUp 阶段中,事件从目标元素的父级发送回面板的根元素。
在最后一个阶段(DefaultAction 阶段)中,事件重新发送到目标元素。
None | 事件未传播。 |
TrickleDown | 事件从面板的根元素发送到目标元素的父级。 |
AtTarget | 事件发送到目标。 |
DefaultActionAtTarget | 事件发送到目标元素,然后可以在目标阶段执行元素的默认操作。事件处理程序在此阶段不接收事件。而是对目标元素调用 ExecuteDefaultActionAtTarget。 |
BubbleUp | 事件从目标元素的父级发送回面板的根元素。 |
DefaultAction | 事件发送到目标元素,然后可以执行元素的最终默认操作。事件处理程序在此阶段不接收事件。而是对目标元素调用 ExecuteDefaultAction。 |
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