分享一种挂黑链的方法

今天浏览百度快照的时候发现了一种挂黑链的方法，快照中正常显示链接，但是网页中隐藏了。
以前一直没有见过，把代码分享出来。
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<strong> <a title=”腾冠科技 --服务器租用” href=”http://www.do99.com/”>腾冠科技</a> </strong>
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<script>document.getElementById(“urltt”).style.display=”none”</script>
原理是调用JavaScript脚本 应用css样式把ID为urltt的rul 隐藏掉了。http://event.weibo.com/21680250
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