Event.returnValue

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Event.returnValue 属性表示该事件的默认操作是否已被阻止。默认情况下,它被设置为 true,即允许进行默认操作。将该属性设置为 false 即可阻止默认操作。

注意: While returnValue has been adopted into the DOM standard, it is present primarily to support existing code. You should use preventDefault(), and defaultPrevented instead of this historical property.

语法

event.returnValue = bool;

var bool = event.returnValue;

A Boolean value which is true if the event has not been canceled; otherwise, if the event has been canceled or the default has been prevented, the value is false.

The value returned by returnValue is the opposite of the value returned by defaultPrevented.

使用备注

returnValue was introduced into the DOM by Internet Explorer 6, and due to that browser's ubiquity became so commonly used that other browsers eventually implemented it as well. It has been adopted into the DOM specification, primarily to ensure that existing web content continues to function going forward.

New projects should generally avoid using returnValue, although they may if they choose to do so.

规范

规范 状态 备注
DOM
returnValue
Living Standard Added for legacy compatibility.

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
returnValue
Deprecated
Chrome Full support YesEdge Full support 12Firefox No support No
Notes
No support No
Notes
Notes Temporarily added in 63, removed in 64, briefly added in 65, then removed again while related compatibility issues are sorted out (see bug 1520756).
IE Full support 6Opera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesFirefox Android No support No
Notes
No support No
Notes
Notes Temporarily added in 63, removed in 64, briefly added in 65, then removed again while related compatibility issues are sorted out (see bug 1520756).
Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes

Legend

Full support  
Full support
No support  
No support
Deprecated. Not for use in new websites.
Deprecated. Not for use in new websites.
See implementation notes.
See implementation notes.