返回值:jQuerykeypress()
概述
触发每一个匹配元素的keypress事件
T这个函数会调用执行绑定到keydown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。keydown事件会在键盘按下时触发
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