Google's tracking code dynamically loads js Code Method Applications

Copy codeThe Code is as follows:
<Script type = "text/javascript">
Var _ gaq = _ gaq | []; // If the Variable _ gaq exists, it is equal to itself; otherwise, it is an empty array.
_ Gaq. push (['_ setaccount', 'ua-24479793-2']); // It is a two-dimensional array _ gaq [0] = array (0 => '_ setaccount ', 1 => 'ua-24479793-2 '); (set the Google account corresponding to this tracking code) _ gaq. push (['_ trackPageview']); // It is a 2-dimensional array _ gaq [1] = array (0 => '_ trackPageview'); (defines tracking by page) (function (){
Var ga = document. createElement ('script'); // create a <script> tag
Ga. type = 'text/javascript '; // <script type = "text/javascript">
Ga. async = true; // This attribute does not seem to exist in async asynchronous scripts.
Ga. src = ('https: '= document. location. protocol? 'Https: // ssl ': 'http: // www') + '.google-analytics.com/ga.js'; // If https:, assign src to the https://ssl.google-analytics.com/ga.js or http://www.google-analytics.com/ga.js var s = document. getElementsByTagName ('script') [0]; // locate the first <script> tag on the current page.
S. parentNode. insertBefore (ga, s); // Add the <script> created by dom to the back of the first <script> tag on the page.
})();
/**
Dynamically load js Code to asynchronously download js Code. Reduces blocking during js file download. Google tracking code **/</script>