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JavaScript手册
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onKeyDown
Executes JavaScript code when a KeyDown event occurs; that is, when the user depresses a key.
语法
onKeyDown="handlerText"
参数
使用的事件属性
| type | 标明了事件的类型。 | | target | 标明了事件原来发送的对象。 | layerX, layerY,
pageX, pageY,
screenX, screenY | For an event over a window, these represent the cursor location at the time the event occurred. For an event over a form, they represent the position of the form element. | | which | Represents the ASCII value of the key pressed. To get the actual letter, number, or symbol of the pressed key, use the String.fromCharCode 方法。 To set this 属性 when the ASCII value is unknown, use the String.charCodeAt 方法。 | | modifiers | Contains the list of modifier keys held down when the event occurred. |
描述
A KeyDown event always occurs before a KeyPress event. If onKeyDown returns false, no KeyPress events occur. This prevents KeyPress events occurring due to the user holding down a key.
参看
onKeyPress, onKeyUp
要获得关于事件句柄的常规信息，请看“事件的常规信息”。
要获得关于事件对象的信息，请看事件。
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