How to use jQuery's ready method correctly? Detailed introduction

How to use jQuery’s ready method correctly?

In front-end development, we often use jQuery to operate DOM elements. To ensure that the operation is performed after the document is loaded, we need to use jQuery's ready method. Correct use of the ready method can avoid exceptions caused by incomplete loading of the document and ensure the stability and reliability of the code.

jQuery's ready method is used to specify the function to be executed when the DOM is completely loaded. This ensures that the JavaScript code is executed after the DOM element is fully loaded, avoiding the situation where the element cannot be found because the DOM has not been fully loaded.

Let’s introduce in detail how to use jQuery’s ready method correctly and provide some specific code examples:

1. Basic usage:

   $(document).ready(function(){
    // 在DOM完全加载后执行的代码
   });

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   Or Use the simplified form:

   $(function(){
    // 在DOM完全加载后执行的代码
   });

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2. Multiple function binding:
   You can bind multiple functions to be executed after the DOM is loaded by passing multiple functions to the ready method. :

   $(document).ready(function(){
    // 第一个函数
   });
   
   $(document).ready(function(){
    // 第二个函数
   });

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3. Arrow function:
   You can also use ES6 arrow functions to define the callback function of the ready method:

   $(document).ready(() => {
    // 在DOM完全加载后执行的代码
   });

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4. Ensure that the code Executed after the page is loaded:
   If you want to ensure that the code is executed after all resources of the page are loaded, you can use the window.onload event:

   $(window).on('load', function(){
    // 在所有资源加载完成后执行的代码
   });

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5. Use the defer attribute:
   Using the defer attribute in the script tag can ensure that the script is executed after the DOM is fully loaded, which can also replace the role of the ready method:

   <script src="yourscript.js" defer></script>

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In actual projects, use jQuery’s ready correctly This method can improve the execution efficiency and stability of the code and avoid problems caused by incomplete DOM loading. By properly writing code to ensure that relevant operations are performed after the document is loaded, the user experience and page performance can be effectively improved.

I hope the above introduction and code examples can help everyone better understand and correctly use jQuery's ready method, making front-end development work smoother and more efficient.

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