Asynchronously dynamically load JS and run (sample code)_javascript skills

As shown below:

Copy the codeThe code is as follows:

(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);

})();