meta属性 在实战中的作用

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下面这两行是做什么呢？引入的是什么？

<script src="https://hm.baidu.com/hm.js?24e22f350777c840b7dcf3743b773722"></script>
 <script src="https://hm.baidu.com/hm.js?a8f092f84053be3765bfad3fc89256e8"></script>

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这块的功能是不是兼容：这些语句是自己写还是也是找出来的呀？

 <script>
            (function(window) {
                var theUA = window.navigator.userAgent.toLowerCase();
                if((theUA.match(/msie\s\d+/) && theUA.match(/msie\s\d+/)[0]) || (theUA.match(/trident\s?\d+/) && theUA.match(/trident\s?\d+/)[0])) {
                    var ieVersion = theUA.match(/msie\s\d+/)[0].match(/\d+/)[0] || theUA.match(/trident\s?\d+/)[0];
                    if(ieVersion < 9) {
                        var str = "你的浏览器版本太low了\n已经和时代脱轨了 :(";
                        var str2 = "推荐使用:<a href='https://www.baidu.com/s?ie=UTF-8&wd=%E8%B0%B7%E6%AD%8C%E6%B5%8F%E8%A7%88%E5%99%A8' target='_blank' style='color:#cc0'>谷歌</a>," +
                            "<a href='https://www.baidu.com/s?ie=UTF-8&wd=%E7%81%AB%E7%8B%90%E6%B5%8F%E8%A7%88%E5%99%A8' target='_blank' style='color:#cc0'>火狐</a>," +
                            "<a href='https://www.baidu.com/s?ie=UTF-8&wd=%E7%8C%8E%E8%B1%B9%E6%B5%8F%E8%A7%88%E5%99%A8' target='_blank' style='color:#cc0'>猎豹</a>,其他双核急速模式";
                        document.writeln("<pre style='font-size: 16px;line-height: 30px;text-align:center;color:#fff;background-color:#0cc; height:100%;border:0;position:fixed;top:0;left:0;width:100%;z-index:1234'>" +
                            "<h2 style='padding-top:200px;margin:0'><strong>" + str + "<br/></strong></h2><p>" +
                            str2 + "</p><h2 style='margin:0'><strong>如果你的使用的是双核浏览器,请切换到极速模式访问<br/></strong></h2></pre>");
                        document.execCommand("Stop");
                    };
                }
            })(window);
        </script>

==$0

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