返回值:jQuerykeyup()
概述
触发每一个匹配元素的keyup事件
这个函数会调用执行绑定到keyup事件的所有函数，包括浏览器的默认行为。可以通过在某个绑定的函数中返回false来防止触发浏览器的默认行为。keyup事件会在按键释放时触发。
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