Asynchronous JavaScript function

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Ethan Karla · Answer

JavaScript itself is synchronous and single-threaded. You cannot write an asynchronous function; plain JS has no timing API. There will be no side-effects from parallel threads.
What you can do is use some APIs provided by your environment (Node.js, Webbrowser) that allow you to schedule asynchronous tasks - using timeouts, ajax, FileAPI, requestAnimationFrame, nextTick, WebWorkers, DOM events, whatever.
An example using setTimeout (provided by the HTML Timing API): 
andlt;!DOCTYPE html>
andlt;html lang='en' xmlns='http://www.w3.org/1999/xhtml'>
andlt;head>
and  and  andlt;meta charset='utf-8' />
and  and  andlt;title>Asynchronous JavaScript andlt;/title>
and  and  andlt;script>
and  and  and  and  window.setTimeout(function () {
and  and  and  and  and  and  console.log('Hello World');
and  and  and  and  }, 1000);
and  and  and  and  document.write('Hello');
and  and  andlt;/script>
andlt;/head>
andlt;body align='center'>
and  and  andlt;h1>Asynchronous JavaScriptandlt;/h1>
andlt;/body>
andlt;/html>
Hope this information has cleared your confusion.
Happy Coding!

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Asynchronous JavaScript function

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