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I need this for SEO optimization. The website I'm working on has a small set of pages that are dynamically generated, but their metadata is very generic - even though these 5 (different) pages have relatively different content, their titles and descriptions are the same, which I want Avoid this situation.

I want to insert the content of a specific page into its meta tag via JavaScript.

The structure of the page is as follows:

<html>
<head>
  <title>這是我想要替換的當(dāng)前標(biāo)題</title>
  <meta name="description" content="這是我想要替換的當(dāng)前描述。">
</head>
<body>
  <h1>文章標(biāo)題</h1>
  <div class="intro">
    <p>這里是簡(jiǎn)介文本</p>
  </div>
  <div class="content">
    <p>這里是內(nèi)容</p>
    <p>更多內(nèi)容</p>
    <p>還有更多內(nèi)容</p>
  </div>
</body>
</html>

I want to inject the following:

".intro" (in this case "Intro text here") -> to the meta description of the page

and

"h1" (in this case "post title") -> to the meta title of the page

Make the final result look like this:

<head>

<title>文章標(biāo)題</title>

<meta name="description" content="這里是簡(jiǎn)介文本。">

</head>

Due to my limited JavaScript skills, currently I can only change the page's title and meta description via:

document.title = "文章標(biāo)題";
document.getElementsByTagName('meta')["description"].content = "這里是簡(jiǎn)介文本。";

Obviously, this method is too static and cannot obtain any data from the page content.

How can I modify the above two lines of code so that the required strings are injected into the meta title and description?

<!doctype html> <html> <head> <title>文章標(biāo)題</title> <meta name="description" content="這里是簡(jiǎn)介文字。"> </head> <body>  <script> // 獲取對(duì)meta元素的引用： const meta = document.querySelector("meta[name='description']"); console.log(meta); // 用于測(cè)試 meta.content = "新的內(nèi)容"; // 將其設(shè)置為你需要的任何值。 console.log(meta); // 用于測(cè)試 </script> </body> </html>