Simple example of dynamically loading js files_javascript skills

The example in this article describes the method of dynamically loading js files. Share it with everyone for your reference, the details are as follows:

function loadScript(url){
var hd = document.getElementsByTagName('head')[0],
js = document.createElement('script');
js.src = url;
js.type = "text/JavaScript";
if(js.addEventListener){
js.addEventListener("load", function(){alert('loaded');}, false);
}else if(js.attachEvent){
js.attachEvent("onreadystatechange", function(){
if(js.readyState === "loaded" || js.readyState === "complete"){
alert('loaded');
}
});
}
hd.appendChild(js);
}

Readers who are interested in more JavaScript-related content can check out the special topics on this site: "Summary of JavaScript switching effects and techniques", "Summary of JavaScript search algorithm techniques", "Summary of JavaScript animation special effects and techniques", "Summary of JavaScript errors and debugging skills", "Summary of JavaScript data structures and algorithm techniques", "JavaScript traversal Summary of Algorithms and Techniques" and "Summary of JavaScript Mathematical Operation Usage"

I hope this article will be helpful to everyone in JavaScript programming.