Google chrome chrome.tabs.onUpdate.addListener会多次触发

我观察到Chrome中tabs API的未更新侦听器确实会多次触发

当我刷新现有选项卡时，警报会弹出3次

当我加载不同的URL时，警报会弹出4次

在警报弹出窗口中，我还看到似乎有“中间”标题标签

我如何避免这种情况并将操作减少到最终更新

chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
/* 
    Multiple Tasks:
    1.  Check whether title tag matches the CPD Teamcenter title and custom success tab does not exist
    2.  If yes, trigger three actions:
        a.  move tab to new Chrome window
        b.  call external application to hide the window with the isolated tab
        c.  add custom success tag to identify that this was already processed
*/

const COMPARESTRING = "My Tab Title"

var title = tab.title;
alert(title)  // this alert pops up 3 or 5 times!  


 /* if (title == COMPARESTRING) {
    return "Match. :-)";
} else {
    return "No match. :-(";
} */

});

---

对于许多子事件，都会调用onUpdate，因此请添加一个类似于

if（changeInfo.title）

的检查，或者您可以检查

changeInfo.status==“complete”