Javascript + 浏览器 - 如何检测开发工具/firebug 何时打开？

Question

在你们中的任何人开始说这是不可能的之前，请导航到 facebook.com 打开开发工具，即使在非附加模式下，它会告诉您开发工具已打开，对吗？

那么 Facebook 是如何做到这一点的呢？

我可以为附加的窗口执行此操作

window.outerHeight - window.innerHeight > 200 || window.outerWidth - window.innerWidth > 200

但是当弹出窗口时，这不起作用。

Facebook 是如何做到这一点的？

Answer 1

如@ elpddev在评论中推测，他们只是使用 console.log在页面加载时记录它，他们没有检测到您已打开控制台。

如果您检查页面上的 JS 代码，您应该会发现以下内容:

var j = i.stop || h._("Stop!")
  , k = i.text || h._("This is a browser feature intended for developers. If someone told you to copy-paste something here to enable a Facebook feature or \"hack\" someone's account, it is a scam and will give them access to your Facebook account.")
  , l = i.more || h._("See {url} for more information.", [h.param('url', 'https://www.facebook.com/selfxss')]);
if ((window.chrome || window.safari) && !i.textonly) {
    var m = 'font-family:helvetica; font-size:20px; ';
    [[j, i.c1 || m + 'font-size:50px; font-weight:bold; ' + 'color:red; -webkit-text-stroke:1px black;'], [k, i.c2 || m], [l, i.c3 || m], ['', '']].map(function(s) {
        setTimeout(console.log.bind(console, '\n%c' + s[0], s[1]));
    });
} else {
    var n = ['', ' .d8888b.  888                       888', 'd88P  Y88b 888                       888', 'Y88b.      888                       888', ' "Y888b.   888888  .d88b.  88888b.   888', '    "Y88b. 888    d88""88b 888 "88b  888', '      "888 888    888  888 888  888  Y8P', 'Y88b  d88P Y88b.  Y88..88P 888 d88P', ' "Y8888P"   "Y888  "Y88P"  88888P"   888', '                           888', '                           888', '                           888']
      , o = ('' + k).match(/.{35}.+?\s+|.+$/g)
      , p = Math.floor(Math.max(0, (n.length - o.length) / 2));
    for (var q = 0; q < n.length || q < o.length; q++) {
        var r = n[q];
        n[q] = r + new Array(45 - r.length).join(' ') + (o[q - p] || '');
    }
    console.log('\n\n\n' + n.join('\n') + '\n\n' + l + '\n');
    return;
}

由于它被缩小了，所以阅读起来有点困难，即使有漂亮的打印。 j = i.stop || h._("Stop!")类型内容似乎正在尝试加载本地化文本，然后恢复为英语。然后，它会测试是否已检测到浏览器为 Chrome 或 Safari 以及 i.textonly未设置，如果设置了，它似乎会以您在 Chrome/Safari 中查看时获得的精美样式显示。 else子句很难理解，但它似乎可以创建您在文本模式或非 Chrome/Safari 浏览器中获得的 ASCII 艺术横幅:

 .d8888b.  888                       888    
d88P  Y88b 888                       888    
Y88b.      888                       888    This is a browser feature intended for 
 "Y888b.   888888  .d88b.  88888b.   888    developers. If someone told you to copy-paste 
    "Y88b. 888    d88""88b 888 "88b  888    something here to enable a Facebook feature 
      "888 888    888  888 888  888  Y8P    or "hack" someone's account, it is a 
Y88b  d88P Y88b.  Y88..88P 888 d88P         scam and will give them access to your 
 "Y8888P"   "Y888  "Y88P"  88888P"   888    Facebook account.
                           888              
                           888              
                           888              

See https://www.facebook.com/selfxss for more information.