创建Chrome插件的manifest.json文件，这是插件的元数据文件，用于定义插件的基本信息，权限，前台页面（如弹出窗口的HTML），以及其他脚本等。
以下是根据Chrome扩展Manifest V3规范的一个较全面的字段列表：
{ "manifest_version": 3, "name": "Extension Name", "version": "1.0", "default_locale": "en", "description": "A description", "icons": { "16": "icon16.png", "48": "icon48.png", "128": "icon128.png" }, "action": { "default_popup": "popup.html", "default_icon": { "16": "icon16.png", "48": "icon48.png", "128": "icon128.png" } }, "author": "Author Name", "automation": "allowed or not", "background": { "service_worker": "background.js" }, "chrome_settings_overrides": { "homepage": "http://www.homepage.com", "search_provider": { "name": "Search Provider Name", "keyword": "keyword", "search_url": "http://www.searchurl.com?q={searchTerms}", "favicon_url": "http://www.faviconurl.com/favicon.ico", "suggest_url": "http://www.suggesturl.com?q={searchTerms}", "instant_url": "http://www.instanturl.com?&q={searchTerms}", "image_url": "http://www.imageurl.com/search?q={searchTerms}&s=image", "new_tab_url": "newtab.html" }, "startup_pages": ["http://www.startuppage.com"] }, "chrome_ui_overrides": { "bookmarks_ui": { "remove_button": true, "remove_bookmark_shortcut": true, "remove_bookmarks_submenu": true } }, "chrome_url_overrides": { "newtab": "newtab.html" }, "commands": { "takeScreenshot": { "suggested_key": { "default": "Ctrl+Shift+Y", "mac": "Command+Shift+Y" }, "description": "Take a screenshot" } }, "content_scripts": [ { "matches": ["http://www.example.com/*"], "css": ["mystyles.css"], "js": ["content_script.js"] } ], "content_security_policy": "script-src 'self' https://example.com; object-src 'self'", "converted_from_user_script": false, "current_locale": "", "declarative_net_request": { "rule_resources": [ { "id": "ruleset_1", "enabled": true, "path": "rules.json" } ] }, "devtools_page": "devtools.html", "event_rules": [ { "event": "runtime.onStartup", "actions": [ { "type": "declarativeContent.ShowPageAction" } ] } ], "externally_connectable": { "matches": ["*://*.example.com/*"] }, "file_browser_handlers": [ { "id": "upload", "default_icon": "icon16.png", "file_filters": [ "filesystem:*.txt" ] } ], "file_system_provider_capabilities": { "configurable": true, "multiple_mounts": true, "source": "network" }, "homepage_url": "http://www.homepage.com", "host_permissions": [ "*://*.example.com/*" ], "import": [ { "id": "abcdefghijklmnoabcdefhijklmnoabc", "minimum_version": "1.0" } ], "incognito": "spanning or split", "input_components": [ { "name": "IME Component", "type": "ime", "id": "com.example.ime", "description": "A tool to input language.", "language": "en", "layouts": ["layout1"] } ], "key": "publicKey", "minimum_chrome_version": "88", "nacl_modules": [ { "path": "module.nmf", "mime_type": "application/x-pnacl" } ], "oauth2": { "client_id": "clientid.apps.googleusercontent.com", "scopes": [ "https://www.googleapis.com/auth/userinfo.email" ] }, "offline_enabled": true, "omnibox": { "keyword": "keyword" }, "optional_permissions": ["tabs"], "options_page": "options.html", "options_ui": { "chrome_style": true, "page": "options.html" }, "permissions": ["storage"], "platforms": [ { "nacl_arch": "x86-32", "sub_package_path": "_platform_specific/x86-32/" } ], "replacement_web_app": {}, "requirements": { "3D": { "features": ["webgl"] } }, "sandbox": [ { "pages": ["sandbox.html"], "content_security_policy": "sandbox allow-scripts allow-same-origin" } ], "short_name": "Short Name", "storage": { "managed_schema": "schema.json" }, "tts_engine": { "voices": [ { "voice_name": "Voice", "lang": "en-US", "gender": "male", "event_types": ["start", "end", "error"] } ] }, "update_url": "http://www.update_url.com", "version_name": "1.0 beta", "web_accessible_resources": [ { "resources": [ "images/*.png" ], "matches": [ "https://*.example.com/*" ] } ] }
上述各个字段的含义如下：
manifest_version: 清单文件的版本，必须字段，当前应为3。name: 扩展的名称，必须字段。version: 扩展的版本号，必须字段。default_locale: 如果您的扩展支持多种语言，则需要此字段。description: 对扩展的简单描述。icons: 一个对象，为扩展提供不同尺寸的图标。action: 用来定义浏览器操作栏（浏览器旁边的扩展图标）的行为，例如弹出页面等。author: 扩展的作者名字。automation: 指出扩展是否可以自动化Chrome浏览器的某些操作。background: 定义后台持久性脚本或持久性页面。chrome_settings_overrides: 覆盖Chrome的某些设置，例如主页、搜索提供程序或启动页。chrome_ui_overrides: 覆盖Chrome用户界面的某个部分，比如书签界面。chrome_url_overrides: 覆盖特定的内置页面，比如新标签页。commands: 定义扩展的键盘快捷键。content_scripts: 向特定网页注入脚本的配置。content_security_policy: 定义内容安全策略。converted_from_user_script: 表示扩展是否是从用户脚本转换而来。current_locale: 插件当前的本地化语言。declarative_net_request: 声明性网络请求配置。devtools_page: 为Chrome开发者工具定义一个自定义页面。event_rules: 定义扩展中的事件规则，如果符合某些条件将会触发。externally_connectable: 允许哪些网页与扩展通信。
file_browser_handlers: 定义扩展如何处理文件浏览器中的文件。file_system_provider_capabilities: 定义扩展提供的文件系统的能力。homepage_url: 扩展的主页地址。
host_permissions: 扩展可以访问的网站。import: 允许在扩展之间共享代码。incognito: 定义扩展在隐身模式下的行为。
input_components: 定义输入组件，主要用于输入法扩展。key: 用于更新扩展时验证的公钥。minimum_chrome_version: 扩展需要的最小Chrome版本。nacl_modules: Native Client模块配置。oauth2: OAuth2的配置，如客户端ID和权限范围。offline_enabled: 表示扩展是否可以离线使用。omnibox: 定义扩展如何与地址栏交互。optional_permissions: 用户安装扩展后可以选择性给予扩展的额外权限。options_page: 扩展的选项页面。
options_ui: 配置扩展的选项UI。permissions: 扩展所需的权限。platforms: 针对不同的硬件体系结构提供特定信息。replacement_web_app: 如果扩展是为了替代一个现有的Web应用程序。requirements: 扩展所需要的Chrome的某些特殊功能。sandbox: 设置一个或多个网页为沙盒模式，以限制权限。
short_name: 扩展的简称。storage: 关于扩展存储的信息。tts_engine: 文字到语音转换引擎配置。update_url: 扩展更新的JSON文件地址。version_name: 一个更具可读性的版本名字。web_accessible_resources: 列出可以被网页访问的扩展资源。
这些字段和选项构成了扩展程序的核心配置，开发者需要可以根据自己扩展的功能来选择需要用到的字段。
以上仅仅是Chrome插件的入门教程，下一节课，我将带领大家实操，敬请期待~
