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但是你怎么知道当前是哪个元素在处理点击事件？
Please note that these properties don't always work on a click event.
youdao
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最后为点击事件关联一个处理器。
Finally, you assign an internal handler to the Click event.
youdao
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最后为点击事件关联一个处理器。
Finally, you assign an internal handler to the Click event.
youdao