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CSS transition effect: How to achieve the fade-in and fade-out rotation effect of elements

WBOYOriginal: 2023-11-21 13:18:471157browse

CSS transition effect is an animation effect used to control the state of an element when it changes. It can achieve smooth transition. In this article, I will introduce how to use CSS to achieve the fade rotation effect of elements and provide specific code examples.

First, we need to create an HTML page that contains the elements to which we want to apply the transition effect. Here is a sample code:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS过渡效果示例</title>
  <link rel="stylesheet" href="styles.css">
</head>
<body>
  <div class="box">
    <h1>Hello, CSS Transitions!</h1>
  </div>
</body>
</html>

In the above code, we create a <div> element with the class name "box" and include a title. <p>Next, we need to add CSS styles to the elements to achieve animation effects. In this case, we want the element to gradually change from transparent to opaque as it fades in, and from opaque to transparent as it fades out, and we also want the element to rotate during the transition. Here is the corresponding CSS code example: </p><pre class='brush:css;toolbar:false;'>.box { width: 200px; height: 200px; background-color: #f1f1f1; opacity: 0; transition: opacity 1s, transform 1s; } .box.fade-in { opacity: 1; transform: rotate(360deg); } .box.fade-out { opacity: 0; transform: rotate(-360deg); }</pre><p> In the above code, we first set the width, height and background color of the element and set the transparency to 0. Then, we use the <code>transition attribute to specify the attributes and transition time that need to be transitioned. Here we set the transparency and rotation effects to both need to be transitioned, and the duration is 1 second.

Next, we define two style rules with class names "fade-in" and "fade-out". Represents the fade-in and fade-out effects respectively. By modifying the transparency and rotation properties, the effect of elements gradually showing and hiding is achieved.

Finally, we need to add a trigger event for the animation effect to the element. Animation effects can be triggered using JavaScript or CSS pseudo-classes. The following is a sample code that uses JavaScript to trigger animation effects:

let boxElement = document.querySelector('.box');

boxElement.addEventListener('click', function() {
  boxElement.classList.toggle('fade-in');
  boxElement.classList.toggle('fade-out');
});

In the above code, we first use the querySelector method to obtain the element with the class name "box" and add It is stored in the variable boxElement. Then we use the addEventListener method to bind a click event to the element. When the element is clicked, we switch the class name of the element through the toggle method of the classList attribute, thereby triggering the fade in and fade out effect.

Through the above steps, we can achieve the fade-in and fade-out rotation effect of elements. In practical applications, you can adjust the transition time, rotation angle, trigger events, etc. as needed to meet your specific needs.

Summary:
This article introduces how to use CSS to achieve the fade-in and fade-out rotation effect of elements, and provides specific code examples. Through CSS transition effects, we can easily add animation effects to elements to improve user experience. Hope this article is helpful to you!

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