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Learn more about the role of the ready function in jQuery

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Release： 2024-02-28 11:48:04

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Learn more about the role of the ready function in jQuery

jQuery is a popular JavaScript library that is widely used to develop interactive web pages and web applications. One of the important functions is the ready function, which executes the specified function when the document is fully loaded and ready. This article will delve into the role of the ready function in jQuery and illustrate its usage and effects through specific code examples.

1. The role of the ready function in jQuery

In web development, sometimes you need to ensure that some JavaScript code is executed after the document is fully loaded to avoid page elements that are not fully loaded. Errors caused by executing code. The ready function in jQuery exists to solve this problem. When the document is loaded, that is, the DOM structure is fully constructed and all resources are ready, the ready function triggers the bound callback function.

2. How to use the ready function in jQuery

When using the ready function of jQuery, you can execute the callback function in the following ways:

(1) Use .ready()

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

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(2) Use $()

$(function() {
    // 在文档加载完毕后执行的代码
    alert('文档已加载完毕');
});

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(3) Use direct call

jQuery(document).ready(function() {
    // 在文档加载完毕后执行的代码
    alert('文档已加载完毕');
});

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3. Specific code examples

below is a simple example that shows how to use the ready function in jQuery to modify the content of page elements after the document is loaded:

<!DOCTYPE html>
<html>
<head>
    <title>jQuery Ready函数示例</title>
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <script>
        $(document).ready(function() {
            $('#message').text('文档已加载完毕，jQuery Ready函数执行成功！');
        });
    </script>
</head>
<body>
    <div id="message">这是一个文档加载中的提示</div>
</body>
</html>

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In the above example, when the document is loaded, jQuery will The text content of the div element with the id of message is modified to "The document has been loaded and the jQuery Ready function was executed successfully!".

4. Conclusion

Through the above example, we can see the role of the ready function in jQuery and how to use it to ensure that the corresponding JavaScript code is executed after the document is loaded. Using the ready function can effectively avoid errors caused by executing code when page elements are not fully loaded. It is a very practical tool in web development. I hope this article can help readers gain a deeper understanding of the usage and role of the ready function in jQuery.

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