Google Analytics javascript

Question

这是Google Analytics的代码

var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-20366831-2']);
_gaq.push(['_trackPageview']);

(function () {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();

我的客户端如何调用Google匿名函数？

Answer 1

这是因为匿名函数以.结尾 ()

    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})(); // <--- The () calls the anonymous code

正如您将看到的,此代码基本上将一个script标记注入到DOM中,该标记由浏览器运行.