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1.阻止事件冒泡,但不阻止默认行为。如 stopPropagation 或 cancelBubble等。 2.阻止默认行为,但不阻止事件冒泡。如 preventDefault 方法。 3.同时阻止事件冒泡和默认行为。直接 return false 即可。
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