「document.writeでScript」の書き出しを別の方法に書き換える

var url="https://example.com/script.js";

document.write('<script type="text/javascript" src="'+url+'></script>');

var url="https://example.com/script.js";

var new_script = document.createElement('script');
new_script.type = 'text/javascript';
new_script.src = url;
//new_script.async = false;
//new_script.defer = false;

var scripts = document.getElementsByTagName('script');
var this_script = scripts[scripts.length - 1];
this_script.parentNode.insertBefore(new_script, this_script);