Google Analytics(分析)跟踪代码如何工作? (异步方法调用?) [英] How is the Google Analytics Tracking code working? (async method call?)

问题描述

此代码是Google Analytics(分析)跟踪代码.由于ga方法未得到改进，怎么不会出错?

This code is the Google Analytics tracking code. How is not make an error because of undifened ga method?

(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');

ga('create', 'UA-XXXX-Y', 'auto');

ga('send', 'pageview');

推荐答案

展开后，脚本如下所示:

Expanded, the script looks like this:

(function(i, s, o, g, r, a, m) {
    i['GoogleAnalyticsObject'] = r;
    i[r] = i[r] || function() {
        (i[r].q = i[r].q || []).push(arguments)
    }, i[r].l = 1 * new Date();
    a = s.createElement(o),
    m = s.getElementsByTagName(o)[0];
    a.async = 1;
    a.src = g;
    m.parentNode.insertBefore(a, m)
})(window, document, 'script', '//www.google-analytics.com/analytics.js', 'ga');

ga('create', 'UA-XXXX-Y', 'auto');

ga('send', 'pageview');

您会注意到，'ga'是传递给该函数的第五个参数，而window是第一个传递给该函数的参数.在初始化内部，前几行将i[r](也称为window['ga'])设置为一个函数.然后你就走了！

You'll notice that 'ga' is the fifth parameter passed to the function, and window is the first. Inside the initialization, the first couple lines set i[r], aka window['ga'] to a function. And there you go!

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