使用document.title。

请参阅本页的基本教程。

对于那些寻找它的NPM版本的人，有一个完整的库:

npm install --save react-document-meta

import React from 'react';
import DocumentMeta from 'react-document-meta';

class Example extends React.Component {
  render() {
    const meta = {
      title: 'Some Meta Title',
      description: 'I am a description, and I can create multiple tags',
      canonical: 'http://example.com/path/to/page',
      meta: {
        charset: 'utf-8',
        name: {
          keywords: 'react,meta,document,html,tags'
        }
      }
    };

    return (
      <div>
        <DocumentMeta {...meta} />
        <h1>Hello World!</h1>
      </div>
    );
  }
}

React.render(<Example />, document.getElementById('root'));

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!

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。

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.

我想从未来向你问好:)最近发生的事情:

谷歌现在运行javascript，是在你的网站1 人们现在使用React.js、Ember和Angular在页面上运行复杂的javascript任务，而且它仍然被Google1索引 你可以使用html5历史api (pushState, react-router, ember, angular)，它允许你做一些事情，比如为你想打开的每个选项卡设置单独的url，谷歌将索引that1

所以为了回答你的问题，你可以安全地从javascript中更改标题和其他元标签(如果你想支持非谷歌搜索引擎，你也可以添加一些像https://prerender.io这样的东西)，只是让它们作为单独的url访问(否则谷歌如何知道这些是要在搜索结果中显示的不同页面?)更改SEO相关标签(在用户通过点击更改页面后)很简单:

if (document.title != newTitle) {
    document.title = newTitle;
}
$('meta[name="description"]').attr("content", newDescription);

只要确保css和javascript没有在robots.txt中被阻止，你可以在谷歌网站管理员工具中使用Fetch作为谷歌服务。

1: http://searchengineland.com/tested-googlebot-crawls-javascript-heres-learned-220157