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keydown([[data],fn])
概述
当键盘或按钮被按下时，发生 keydown 事件。
注释：如果在文档元素上进行设置，则无论元素是否获得焦点，该事件都会发生。
参数
fnFunctionV1.0
在每一个匹配元素的keydown事件中绑定的处理函数。
[data],fnString,FunctionV1.4.3
data:keydown([Data], fn) 可传入data供函数fn处理。
fn:在每一个匹配元素的keydown事件中绑定的处理函数。
示例
描述:
在页面内对键盘按键做出回应，可以使用如下代码:
jQuery 代码:
$(window).keydown(function(event){
switch(event.keyCode) {
// ...
// 不同的按键可以做不同的事情
// 不同的浏览器的keycode不同
// 更多详细信息: http://unixpapa.com/js/key.html
// 常用keyCode： 空格 32 Enter 13 ESC 27
}
});