Now that we have jQuery, why does CSS3 still have animation functions? Understand the pros and cons of both

Since we have jQuery, why does CSS3 still have animation function? Understand the advantages and disadvantages of both

With the development of the Internet and the increasing needs of users, web animation plays an increasingly important role in website design. In order to achieve various animation effects, developers can choose to use jQuery or CSS3. So, now that we have the powerful jQuery, why does CSS3 still have animation capabilities? This article will discuss the advantages and disadvantages of both and provide relevant code examples.

1. Understand the animation functions of jQuery and CSS3

1. jQuery animation
   jQuery is a fast and concise JavaScript library that provides a wealth of functions and plug-ins to make development Users can easily achieve various interactive effects. The animation functions included can achieve smooth transitions, dynamic effects and interactive behaviors of elements by changing CSS property values. By using jQuery, developers can achieve compatible animation effects by writing a small amount of JavaScript code.
2. CSS3 animation
   CSS3 is the latest version of CSS. It introduces many powerful animation functions. Developers can achieve various animation effects through pure CSS code. The animation properties of CSS3 include @keyframes, animation, transition, etc. These functions allow developers to freely set various parameters of animation, such as animation time, delay, speed curve, etc. Using CSS3 animations, developers can add simple CSS classes and styles without having to write a lot of JavaScript code.

2. Compare the animation functions of jQuery and CSS3

1. Performance
   Since jQuery implements animation effects through JavaScript, it is slightly insufficient in terms of performance. Especially when dealing with complex animations, the need to frequently manipulate DOM elements may cause page lags and performance degradation. CSS3 animations are processed by the browser itself, so it can better utilize hardware acceleration and have better performance.
2. Compatibility
   Since jQuery is a cross-browser JavaScript library, it can run well in various browsers. However, the animation function of CSS3 may not display properly in some older versions of browsers, especially IE9 and below. However, as browsers are updated and users use new browsers more and more, CSS3 compatibility issues are gradually being resolved.
3. Development Difficulty
   Compared with CSS3, using jQuery to achieve animation effects requires writing a certain amount of JavaScript code. For some developers who are not familiar with JavaScript, it may increase the development difficulty. CSS3 animation can be realized directly by writing CSS styles, and the development difficulty is relatively low.

3. Code Example

The following is a code example of a pop-up animation effect using jQuery and CSS3:

1. Using jQuery to implement pop-up animation

<div id="box"></div>
<button onclick="animate()">点击开始动画</button>

<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script>
  function animate() {
    $("#box").animate({ 
      width: "200px",
      height: "200px",
      opacity: 1
    }, 1000);
  }
</script>

<style>
  #box {
    width: 100px;
    height: 100px;
    background-color: blue;
    opacity: 0;
  }
</style>

2. Use CSS3 to implement pop-up animation

<div id="box"></div>
<button onclick="animate()">点击开始动画</button>

<script>
  function animate() {
    const box = document.getElementById("box");
    box.classList.add("animate");
  }
</script>

<style>
  #box {
    width: 100px;
    height: 100px;
    background-color: blue;
    opacity: 0;
    transition: all 1s;
  }

  #box.animate {
    width: 200px;
    height: 200px;
    opacity: 1;
  }
</style>

The above codes respectively implement a pop-up animation effect. After clicking the button, the box element will change from its original size and Opacity fades to 200px width and height and fully opaque.

By comparing the code examples of the two, we can see that using jQuery requires more JavaScript code to achieve animation effects, while using CSS3 can be achieved directly by adding CSS classes.

To sum up, despite the powerful jQuery, the reason why CSS3 still has animation functions is that CSS3 animation has better performance, lower development difficulty and better compatibility. When you need to implement some simple animation effects, it is recommended to use CSS3. For complex animation effects, you can consider combining the advantages of both.

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