我如何获得标签的前一个网址?

问题描述:

在编写Chrome扩展程序时,如果有选项卡,如何才能在该选项卡中获取先前访问过的页面的网址?也就是说,在我点击返回之后出现在omnibar中的url?

When writing a Chrome extension, given a tab, how can I get the URL of the previously-visited page in that tab? i.e. the url that will appear in the omnibar after I hit "back"?

由于我找不到任何API方法,我刚才应用了 vux777上面的建议 :每次加载一个页面时,我都会存储一个从它的id到它的URL的映射。然后,当我想查找标签的上一页时,我可以在那里搜索它。

Since I could not find any API approach, I just applied vux777's suggestion above: every time a page loads I store a mapping from its id to its URL. Then when I want to find the previous page of a tab, I can search for it there.

因此,存储:

chrome.webNavigation.onCommitted.addListener(function (data) {
  if (data.frameId !== 0) {
      // Don't trigger on iframes
      return;
  }

  var tabIdToUrl = {};
  tabIdToUrl[data.tabId.toString()] = data.url;
  chrome.storage.local.set(tabIdToUrl);
});

检索:

And retrieval:

chrome.storage.local.get(tabId, function (item) {
  var url = item[tabId];
  ...
});