How to use jquery to switch themes

With the development of Internet technology, the user experience of Web applications is becoming increasingly important. Among them, the change of website theme is a point that users often pay attention to. In this article, we will introduce a method to use jQuery to switch website themes.

First, we need a CSS file to store the styles of different themes. To facilitate testing, here we only prepare two styles:

/* 主题1 */
body {
    background-color: #fff;
    color: #333;
}

/* 主题2 */
body.theme2 {
    background-color: #333;
    color: #fff;
}

Then, we need an HTML file to reference the jQuery library and CSS files, and to display the theme switching button:

nbsp;html>


    <meta>
    <title>用jQuery实现How to use jquery to switch themes</title>
    <link>
    <script></script>
    <script></script>


    <h1>用jQuery实现How to use jquery to switch themes</h1>
    <p>这是一个简单的网站主题切换示例。</p>
    <button>How to use jquery to switch themes</button>

Next , we need a JavaScript file to control the theme switching function. In this file, we define a function switchTheme for switching themes:

$(function() {
    // 当页面加载完成后，执行以下代码
    var theme = 'theme1'; // 默认主题为1
    $('#theme-switcher').click(function() {
        var body = $('body');
        if(theme === 'theme1') {
            body.addClass('theme2');
            theme = 'theme2';
        } else {
            body.removeClass('theme2');
            theme = 'theme1';
        }
    });
});

Code breakdown:

First, in $(function() { })All code is written in statements to ensure that they are executed after the document is loaded.

Secondly, we define a variable theme to store the currently used theme.

Then, we add a click event listener to the button with the ID theme-switcher. When the user clicks this button, we perform the following steps:

• Select the body element
• If the current theme is 1, add a theme2 class and set the variable theme to 2
• Otherwise, delete the theme2 class and set the variable theme to 1

Finally, to ensure that the code works properly, we need to execute it immediately after the page has finished loading.

Now, we have all the necessary code set up. Just start our local server (if it exists), open a browser and access this HTML file, we can see a theme toggle button. When we click on it, the theme of the website will switch to a different style. Here is a demo screenshot:

Summary:

In this article, we have completed a simple jQuery implementation of website theme switching. Although this is just a simple example, it demonstrates how to easily achieve some interesting functionality using jQuery. It is worth mentioning that this user-customizable feature improves user satisfaction and can also be an important consideration in product design.

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