How to dynamically load and use/call a JavaScript file?

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You could do it like this:

function loadjs(file) {
    var script = document.createElement("script");
    script.type = "text/javascript";
    script.src = file;
    script.onload = function(){
        alert("Script is ready!"); 
        console.log(test.defult_id);
    };
    document.body.appendChild(script);
 }

For more information read this article : https://www.nczonline.net/blog/2009/06/23/loading-javascript-without-blocking/

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