防劫持

<!--<script>
    // start 防劫持
    //设置cookie
    function setCookie(name, value, domain, path, expires) {
        if(expires){
            expires = new Date(+new Date() + expires);
        }
        var tempcookie = name + '=' + escape(value) +
                ((expires) ? '; expires=' + expires.toGMTString() : '') +
                ((path) ? '; path=' + path : '') +
                ((domain) ? '; domain=' + domain : '');
        //Ensure the cookie's size is under the limitation
        if(tempcookie.length < 4096) {
            document.cookie = tempcookie;
        }
    }
    //获取cookie
    function getCookie(name) {
        var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
        if (arr = document.cookie.match(reg))
            return (arr[2]);
        else
            return null;
    }
    //创建并发送请求
    function createSender(url){
        var img = new Image();
        img.onload = img.onerror = function(){
            img = null;
        };
        img.src = url;
    };
    (function(){
        /*
         *防劫持逻辑所需参数在此处设置参数即可
         *cookieName:用于记录连续被劫持的次数，为防止死循环，cookie值为3以上则不进行url重置
         *cookieDomain:cookie所在的域
         *reportUrl:非连续性劫持时上报的接口地址【如无需上报，可不填】
         *reportUrl2：连续性劫持时上报的接口地址【如无需上报，可不填】
         */
        var cookieName = 'hiijack';
        var cookieDomain = '.readnovel.com';
        var reportUrl = '//www.readnovel.com/ajax/safe/hiijackReport?times=1&_csrfToken='+ getCookie('_csrfToken')||'';
        var reportUrl2 = '//www.readnovel.com/ajax/safe/hiijackReport?times=3&_csrfToken='+ getCookie('_csrfToken')||'';
        //判断是否被iframe
        if (top.location !== self.location) {
            //用于记录被劫持的次数
            var countHijack;
            //如果未设置cookie，则需要set一下cookie，否则获取此cookie的值
            if(!getCookie(cookieName)){
                setCookie(cookieName,0 ,cookieDomain, '', 30*24*60*60*1000);
                countHijack = 0;
            }else{
                countHijack = parseInt(getCookie(cookieName));
            }
            //如果连续被劫持的次数大于等于3次，则发请求上报此情况,否则上报非连续性的情况,同时累加被劫持次数、重置当前url
            if(countHijack >= 3){
                reportUrl2 && reportUrl2!='' && createSender(reportUrl2);
            }else{
                reportUrl && reportUrl!=''&& createSender(reportUrl);
                countHijack ++;
                setCookie(cookieName, countHijack ,cookieDomain, '', 30*24*60*60*1000);
                top.location = self.location;
            }
        }
        //每次成功进入页面则计数清0
        setCookie(cookieName, 0 ,cookieDomain, '', 30*24*60*60*1000);
    })();
    //end 防劫持
</script>-->