Event.returnValue

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.

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