keyup

当一个按键被释放时，keyup事件被触发。

General info

Specification

DOM L3

Interface

KeyboardEvent

Bubbles

Yes

Cancelable

Yes

Target

Document, Element

Default Action

None

Properties

Property	Type	Description
target 只读	EventTarget	The event target (the topmost target in the DOM tree).
type 只读	DOMString	The type of event.
bubbles 只读	Boolean	Whether the event normally bubbles or not
cancelable 只读	Boolean	Whether the event is cancellable or not?
view 只读	WindowProxy	document.defaultView (window of the document)
detail 只读	long (float)	0.
target	EventTarget (DOM element)	Focused element processing the key event, root element if no suitable input element focused.
char 只读 未实现 (查看 bug 680830)	DOMString (string)	The character value of the key. If the key corresponds to a printable character, this value is a non-empty Unicode string containing that character. If the key doesn't have a printable representation, this is an empty string. See key names and char values for the detail. Note: If the key is used as a macro that inserts multiple characters, this attribute's value is the entire string, not just the first character.
key 未实现 (查看 bug 680830)	DOMString (string)	The key value of the key represented by the event. If the value has a printed representation, this attribute's value is the same as the char attribute. Otherwise, it's one of the key value strings specified in {{ anch("Key values") }}. If the key can't be identified, this is the string "Unidentified". See key names and char values for the detail. Read Only.
charCode 只读	Unsigned long (int)	The Unicode reference number of the key; this attribute is used only by the keypress event. For keys whose char attribute contains multiple characters, this is the Unicode value of the first character in that attribute. Warning: This attribute is deprecated; you should use char instead, if available.
keyCode 只读	Unsigned long (int)	A system and implementation dependent numerical code identifying the unmodified value of the pressed key. This is usually the decimal ASCII ({{ RFC(20) }}) or Windows 1252 code corresponding to the key; see {{ anch("Virtual key codes") }} for a list of common values. If the key can't be identified, this value is 0. Warning: This attribute is deprecated; you should use key instead, if available.
which 只读	Unsigned long (int)	A system and implementation dependent numeric code identifying the unmodified value of the pressed key; this is usually the same as keyCode. Warning: This attribute is deprecated; you should use key instead, if available.
location 只读	long (float)	The location of the key on the device.
repeat 只读 未实现	boolean	true if a key has been depressed long enough to trigger key repetition, otherwise false.
locale 只读 未实现	string	The language code for the key event, if available; otherwise, the empty string.
ctrlKey 只读	boolean	true if the control key was down when the event was fired. false otherwise.
shiftKey 只读	boolean	true if the shift key was down when the event was fired. false otherwise.
altKey 只读	boolean	true if the alt key was down when the event was fired. false otherwise.
metaKey 只读	boolean	true if the meta key was down when the event was fired. false otherwise.

Related Events

• keydown
• keyup
• keypress
• input (event)