Replace the jQuery Document Ready Function with JavaScript

jQuery's $(document).ready() method is used to execute code after the DOM is fully loaded. Since it executes the given function when all DOM elements are available, it ensures that attempts to access or operate on the element work properly.

Before jQuery 3.0, the typical usage of using anonymous functions is as follows:

<code class="language-javascript">$(document).ready(function() {
  // .ready() 的处理程序被调用。
});</code>

Key Points

• jQuery's document.ready method ensures that the code is executed only when all DOM elements are safe and actionable, but has been significantly changed in jQuery 3.0 and all syntax methods (except $(handler);) are deprecated.
• DOMContentLoaded Events are pure JavaScript alternatives to jQuery ready methods that can be used in modern browsers and IE9. For older versions of IE, the onreadystatechange event can be used.
• In many cases, any of these solutions may not be required. Just put the JavaScript code before the end tag

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