js问题 这段代码运用了什么知识点 是什么意思?
<script>(function (i, s, o, g, r, a, m) {
i['GoogleAnalyticsObject'] = r;
i = i || function () {
(i.q = i.q || []).push(arguments)
}, i.l = 1 * new Date();
a = s.createElement(o),
m = s.getElementsByTagName(o);
a.async = 1;
a.src = g;
m.parentNode.insertBefore(a, m)
})(window, document, 'script', 'https://www.google-analytics.com/analytics.js', 'ga');
ga('create', 'UA-76796224-1', 'auto');
ga('send', 'pageview');
</script> 只看出来有一个立即执行函数
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