更新:根据SearchEngineLand上的评论和参考 大多数网络爬虫将索引更新的标题。下面的答案是过时的，但代码仍然适用。

You can just do something like, document.title = "This is the new page title.";, but that would totally defeat the purpose of SEO. Most crawlers aren't going to support javascript in the first place, so they will take whatever is in the element as the page title. If you want this to be compatible with most of the important crawlers, you're going to need to actually change the title tag itself, which would involve reloading the page (PHP, or the like). You're not going to be able to get around that, if you want to change the page title in a way that a crawler can see.

使用document.title。

请参阅本页的基本教程。

使用文档。标题是如何在JavaScript中完成它，但这应该如何协助SEO?机器人通常不会在遍历页面时执行javascript代码。

想到的一种方法，可能有助于搜索引擎优化，仍然有你的标签页，因为他们将使用命名锚对应于每个标签，如:

http://www.example.com/mypage#tab1, http://www.example.com/mypage#tab2等。

您需要服务器端处理来解析url，并在浏览器呈现页面时设置初始页面标题。我还会把这个标签设置为“活动”标签。一旦页面被加载，一个实际的用户正在切换标签，你将使用javascript来改变文档。标题如其他用户所述。

但是为了得到SEO的配合

当页面发生变化时，你需要重新加载页面，这样搜索引擎才能看到不同的标题等等。

因此，确保页面重新加载工作，然后再添加文档。标题修改

Google mentioned that all js files rendered but in real, I've lost my title and another meta tags which had been provided by Reactjs on this website and actually lost my position on Google! I've searched a lot but it seems that all pages must have pre-rendered or using SSR(Server Side Rendering) to have their SEO-friendly protocole! It expands to Reactjs, Angularjs , etc. For short, Every page that has view page source on browser is indexed by all robots, if it's not probably Google can index but others skip indexing!