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编写一个简单的chrome截图扩展

news 来源：原创 2025/5/10 14:58:13

文件结构：

screenshot
|-- background.js          ---> service_worker运行的js
|-- images                 ---> 图片
|   |-- logo-128x128.png
|   |-- logo-16x16.png
|   |-- logo-32x32.png
|   `-- logo-48x48.png
`-- manifest.json          ---> JSON文件描述了扩展程序的功能和配置

1 directory, 6 files

manifest.json文件：

{
    "manifest_version": 3, // manifest版本
    "name": "screenshot", // 名称
    "description": "截图", // 描述
    "version": "1.0", // 版本
    "icons": {
        // 扩展程序页面的图片
        "16": "images/logo-16x16.png",
        "32": "images/logo-32x32.png",
        "48": "images/logo-48x48.png",
        "128": "images/logo-128x128.png"
    },
    "background": {
        "service_worker": "background.js"
    },
    "action": {
        // 扩展程序工具栏上的主图片
        "default_icon": {
            "16": "images/logo-16x16.png",
            "32": "images/logo-32x32.png",
            "48": "images/logo-48x48.png",
            "128": "images/logo-128x128.png"
        }
    },

    // 权限
    "permissions": [
        "activeTab",
        "downloads"
    ],

    // 命令
    "commands": {
        "shortcut": {
            "suggested_key": {
                "default": "Ctrl+Shift+S",
                "mac": "Command+Shift+S"
            },
            "description": "截图"
        }
    }
}

background.js文件：

// 点击扩展的图标截图
// https://developer.chrome.com/docs/extensions/reference/api/action?hl=zh-cn
chrome.action.onClicked.addListener(async function () {
    // https://developer.chrome.com/docs/extensions/reference/api/tabs?hl=zh-cn
    const screenshotUrl = await chrome.tabs.captureVisibleTab(); // 截取指定窗口中当前处于活动状态的标签页的显示区域
    console.log(screenshotUrl);

    // https://developer.chrome.com/docs/extensions/reference/api/downloads?hl=zh-cn#method-download
    // https://github.com/GoogleChrome/chrome-extensions-samples/blob/main/_archive/mv2/api/downloads/download_links/manifest.json
    chrome.downloads.download(
        {
            // url、文件名、是否另存为
            url: screenshotUrl,
            filename: "screenshot-by-click",
            saveAs: true
        },
    );
});

// 使用快捷键截图
// https://developer.chrome.com/docs/extensions/reference/api/commands?hl=zh-cn
chrome.commands.onCommand.addListener(async function (command) {
    if (command == "shortcut") {
        // https://developer.chrome.com/docs/extensions/reference/api/tabs?hl=zh-cn
        const screenshotUrl = await chrome.tabs.captureVisibleTab(); // 截取指定窗口中当前处于活动状态的标签页的显示区域
        console.log(screenshotUrl);

        // https://developer.chrome.com/docs/extensions/reference/api/downloads?hl=zh-cn#method-download
        // https://github.com/GoogleChrome/chrome-extensions-samples/blob/main/_archive/mv2/api/downloads/download_links/manifest.json
        chrome.downloads.download(
            {
                // url、文件名、是否另存为
                url: screenshotUrl,
                filename: "screenshot-by-command",
                saveAs: true
            },
        );
    }
});

扩展程序页面：