chrome 插件

目录结构：

meituan-extension    目录名称
  images/            图片目录
    icon16.png       图标
    icon48.png
    icon128.png
  background.js      不详
  contentScript.js   主要脚本内容
  manifest.json      插件说明
  popup.html         插件介绍

对应的内容：
contentScript.js

alert("hello")

manifest.json

{
    "manifest_version": 3,
    "name": "meituan-extension",
    "version": "1.0",
    "description": "扩展了一些作业网站没有的功能",
    "permissions": [
        "activeTab"
    ],
    "action": {
        "default_popup": "popup.html",
        "default_icon": {
            "16": "images/icon16.png",
            "48": "images/icon48.png",
            "128": "images/icon128.png"
        }
    },
    "background": {
        "service_worker": "background.js"
    },
    "content_scripts": [
        {
            "matches": ["<all_urls>"],
            "js": ["contentScript.js"]
        }
    ]
}