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128.JS事件三个阶段 #128

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webVueBlog opened this issue Mar 28, 2020 · 1 comment

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web综合

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webVueBlog commented Mar 28, 2020

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webVueBlog commented Mar 28, 2020

事件的处理过程主要有三个阶段：捕获阶段，目标阶段，冒泡阶段

捕获，事件由页面元素接收，逐级向下，到具体的元素
目标，具体的元素本身
冒泡，元素本身，逐级向上，到页面元素

事件捕获，当使用事件捕获时，父级元素先触发，子元素后触发。
事件冒泡，当使用事件冒泡时，子级元素先触发，父元素后触发

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