Loading Google Analytics in external js file

Here is a great way to load analytics via an external js file: (I created a function, but you can also run it directly)

function loadAnalytics(){
    var import = document.createElement('script');
    import.src='https://www.googletagmanager.com/gtag/js?id=UA-XXXXXXX-1';
    document.head.appendChild(import);
    window.dataLayer = window.dataLayer || [];
    function gtag(){dataLayer.push(arguments);}
    gtag('js', new Date());

    gtag('config', 'UA-XXXXXXX-1');
}

function loadAnalytics(){

var import = document.createElement('script');

import.src='https://www.googletagmanager.com/gtag/js?id=UA-XXXXXXX-1';

document.head.appendChild(import);

window.dataLayer = window.dataLayer || [];

function gtag(){dataLayer.push(arguments);}

gtag('js', new Date());

gtag('config', 'UA-XXXXXXX-1');

}

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