重点内容

内容脚本 content_scripts

1、manifest.json文件配置

{
  "manifest_version": 3,		# *依赖Chrome插件版本
  "name": "FeiFeiYeChuan-Tools-CSDN Article Reading Time", # *插件名称
  "version": "1.0", # *插件版本
  "description": "Add the reading time to Chrome Extension documentation articles",
  "icons": { # 不同情况下显示的图标
    "16": "images/logo.png",
    "32": "images/logo.png",
    "48": "images/logo.png",
    "128": "images/logo.png"
  },
  "content_scripts": [ # content内容
    {
      "js": [
        "scripts/content.js"
      ],
      "css": [
        "css/content.css"
      ],
      "matches": [
        "https://*.blog.csdn.net/*",
        "https://blog.csdn.net/*"
      ]
    }
  ]
}

如上 content_scripts （内容脚本：运行读取和修改网页内容的脚本） 主要用于在固定 matches 网页下的执行脚本内容，他们独立于其他扩展程序和托管页面，拥有独立的js，css脚本。

文件目录

1、整体目录

2、manifest.json

{
  "manifest_version": 3,
  "name": "FeiFeiYeChuan-Tools-CSDN Article Reading Time",
  "version": "1.0",
  "description": "Add the reading time to Chrome Extension documentation articles",
  "icons": {
    "16": "images/logo.png",
    "32": "images/logo.png",
    "48": "images/logo.png",
    "128": "images/logo.png"
  },
  "content_scripts": [
    {
      "js": [
        "scripts/content.js"
      ],
      "css": [
        "css/content.css"
      ],
      "matches": [
        "https://*.blog.csdn.net/*",
        "https://blog.csdn.net/*"
      ]
    }
  ]
}

3、scripts/content.js

onload = function () {
    console.log("content.js已加载");
    const article = document.querySelector(".blog-content-box");

    console.log('article:', article)
    // `document.querySelector` may return null if the selector doesn't match anything.
    if (article) {
        const text = article.textContent;
        // console.log('text:', text)
        const wordMatchRegExp = /\w/g; // Regular expression
        const words = text.matchAll(wordMatchRegExp);
        // matchAll returns an iterator, convert to array to get word count
        const wordCount = [...words].length;
        console.log("wordCount:", wordCount)
        const readingTime = Math.round(wordCount / 200);
        const badge = document.createElement("p");
        // Use the same styling as the publish information in an article's header
        badge.classList.add("color-secondary-text", "type--caption", 'light');
        badge.textContent = `⏱️ ${readingTime} min read`;

        // Support for API reference docs
        const heading = document.querySelector(".title-article");

        heading.insertAdjacentElement("afterend", badge);
    }
}

4、css/content.css

.light{
    color: #77a000;
}