Fired when a tab is zoomed.
browser.tabs.onZoomChange.addListener(listener)
浏览器
.
tabs
.
onZoomChange
.
removeListener
(
listener
)
浏览器
.
tabs
.
onZoomChange
.
hasListener
(
listener
)
Events have three functions:
addListener(callback)
Adds a listener to this event.
removeListener(listener)
Stop listening to this event. The
listener
argument is the listener to remove.
hasListener(listener)
校验是否
listener
is registered for this event. Returns
true
if it is listening,
false
否则。
callback
Function that will be called when this event occurs. The function will be passed the following arguments:
ZoomChangeInfo
对象
. Information about the zoom event.
tabId
integer
. ID of the tab that was zoomed.
oldZoomFactor
编号
. The previous zoom factor.
newZoomFactor
编号
. The new zoom factor.
zoomSettings
tabs.ZoomSettings
. Zoom settings for the tab.
Listen for zoom events and log the info:
function handleZoomed(zoomChangeInfo) {
console.log("Tab: " + zoomChangeInfo.tabId + " zoomed");
console.log("Old zoom: " + zoomChangeInfo.oldZoomFactor);
console.log("New zoom: " + zoomChangeInfo.newZoomFactor);
}
browser.tabs.onZoomChange.addListener(handleZoomed);
BCD tables only load in the browser
注意：
This API is based on Chromium's
chrome.tabs
API. This documentation is derived from
tabs.json
in the Chromium code.
Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.
最后修改： , 由 MDN 贡献者