After registering an account on cnzz first, he will give you the following code:
<span style="font-size:18px;"><script type="text/javascript">var cnzz_protocol = (("https:" == document.location.protocol) ? " https://" : " http://");document.write(unescape("%3Cspan id='cnzz_stat_icon_xxxxxxxxxx'%3E%3C/span%3E%3Cscript src='" + cnzz_protocol + "s19.cnzz.com/z_stat.php%3Fid%3D1252929438%26show%3Dpic1' type='text/javascript'%3E%3C/script%3E"));</script></span> The meaning of this js code is, The variable cnzz_protocol is defined according to the transmission protocol used by the current page. If it is the https protocol, then cnzz_protocol="https://", otherwise it is="http://".
The document.write() command simply prints the specified text content to the page.
The unescape() function decodes a string encoded by escape(). Webmaster Tools, I decoded it here, you can Baidu "unescape decoding", there are many online decoding tools.
Decoded by the unescape() function, we can get:
<span style="font-size:18px;">"<span id="cnzz_stat_icon_1252929438"></span><script src="%22%20+%20cnzz_protocol%20+%20%22s19.cnzz.com/z_stat.php?id=xxxxxxxxxx&show=pic1" type="text/javascript"></script>"</span>He created a span element and added a script.
After this script is executed, the page becomes the following
<span style="font-size:18px;"><span id="cnzz_stat_icon_1252929438"> <a href="http://www.cnzz.com/stat/website.php?web_id=xxxxxxxxxx" target="_blank" title="站长统计"> <img src="/static/imghwm/default1.png" data-src="http://icon.cnzz.com/img/pic1.gif" class="lazy" border="0" hspace="0" vspace="0" alt="cnzz code adds elements to page_html/css_WEB-ITnose" > </a></span></span>
<span style="max-width:90%"><script src="http://s19.cnzz.com/z_stat.php?id=xxxxxxxxxx&show=pic1" type="text/javascript"></script></span>
<span style="font-size:18px;"><script src="http://c.cnzz.com/core.php?web_id=xxxxxxxxxx&show=pic1&t=z" charset="utf-8" type="text/javascript"></script></span>Regarding the principle of traffic statistics, you can refer to this article: A brief analysis of the principle of CNZZ website traffic statistics
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