The Event attribute is certainly not unfamiliar to everyone. This article has summarized some common ones. For more information, see altKey, button, cancelBubble, clientX, clientY, and ctrlKey, fromElement, keyCode, offsetX, offsetY, propertyName, returnValue, screenX,
ScreenY, shiftKey, srcElement, srcFilter, toElement, type, x, y
1. altKey Description: checks the status of the alt key.
Syntax: event. altKey
Possible value: When the alt key is pressed, the value is TRUE; otherwise, the value is FALSE. Read-only.
2. button Description: Check the pressed mouse key.
Syntax: event. button
Possible values: 0 No keys, 1 left-click, 2 right-click, 3 right-click, 4 right-click, 5 right-click, and 6 Right-click, and 7 Right-click all keys
This attribute is only used for onmousedown, onmouseup, and onmousemove events. For other events, 0 (such as onclick) is returned regardless of the mouse status ).
3. cancelBubble Description: checks whether the event control of upper-layer elements is accepted.
Syntax: event. cancelBubble [= cancelBubble]
Possible value: This is a read/write Boolean value:
TRUE is not controlled by the event of the parent layer. FALSE allows the event to be controlled by the upper-layer element. This is the default value.
Example: The following code snippet demonstrates that when you click onclick on an image, if the shift key is also pressed at the same time, the upper layer element (body) is canceled) the showSrc () function triggered by the event onclick on.
Reference content is as follows:
The Code is as follows:
