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Detailed explanation of the role and usage of the ready method in jQuery

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Release： 2024-02-29 09:18:04

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Detailed explanation of the role and usage of the ready method in jQuery

In web development, we often use jQuery to simplify the writing of JavaScript code, one of which is a very common method It's the ready method. This article will introduce in detail the role and usage of the ready method in jQuery, and explain it through specific code examples.

1. The role of the ready method:

In jQuery, the ready method is used to ensure that the document is loaded before performing the corresponding operation. Normally, we place the code that needs to be executed after the page is loaded inside the ready method.

2. Usage of the ready method:

The ready method has many uses. The following are examples of several common methods:

The most basic usage:

$(document).ready(function(){
   // 在文档加载完毕后执行的代码
});

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Simplified writing:

$(function(){
   // 在文档加载完毕后执行的代码
});

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These two writing methods are equivalent, and both mean that the following code will be executed after the document is loaded.

Use arrow function:

$(() => {
   // 在文档加载完毕后执行的代码
});

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The function of ready method can also be realized concisely by writing arrow function.

Use ES6 writing method:

$(() => {
   // 在文档加载完毕后执行的代码
});

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The above four writing methods all mean that the corresponding code will be executed after the document is loaded. Developers can choose the appropriate one according to their own preferences. Writing method.

3. Code example:

Next, we will demonstrate the usage of the ready method through a specific example. Suppose we need to modify the text content of an element of the page after the page is loaded. The code is as follows:

<!DOCTYPE html>
<html>
<head>
   <title>jQuery Ready方法示例</title>
   <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
</head>
<body>
   <div id="content">原始内容</div>
   
   <script>
      $(function(){
          $("#content").text("修改后的内容");
      });
   </script>
</body>
</html>

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In the above code, we use the simplified writing method of $() to execute an anonymous function. In this In the function, we select the element with the id of content through the jQuery selector, and use the text method to modify its content to "modified content". Since this code is wrapped inside the ready method, it will only be executed after the page is loaded, ensuring the correctness of the code.

Summary:

Through the introduction of this article, we understand the role and usage of the ready method in jQuery, and through specific code examples, we show how to correctly use the ready method to perform page loading. operation. In actual development, rational use of the ready method can ensure the correct timing of code execution and improve the quality of page loading and interactive effects. Hope this article is helpful to readers.

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