Detailed explanation of animation functions in Vue3: achieving cool animation effects

As Vue.js is used more and more widely, more and more developers are beginning to use Vue.js to achieve some complex interactive effects. In Vue.js 3.0, the animation function has been greatly upgraded, bringing us richer animation effects. In this article, I will introduce you to the animation functions in Vue.js 3.0 in detail, and how to use these functions to achieve cool animation effects.

Animation functions in Vue.js 3.0

In Vue.js 3.0, we can use the following animation functions:

• Transition: insert or delete elements trigger animation.
• v-enter: Trigger animation when element is inserted.
• v-enter-active: Trigger animation when the element is inserted and last for a period of time.
• v-enter-to: The final state of the animation that is triggered when the element is inserted.
• v-leave: Trigger animation when element is removed.
• v-leave-active: Triggers the animation when the element is removed and lasts for a period of time.
• v-leave-to: The final state of the animation that triggers when the element is removed.

The above animation functions can be used on transition tags or individual elements to achieve different animation effects by setting different style classes.

How to use animation functions to achieve cool animation effects

First, we need to define the animation transition effect in the Vue.js component, which can be achieved through the following code:

<template>
  <transition name="fade">
    <p v-if="show">这是一个动画示例</p>
  </transition>
</template>

<style>
.fade-enter-active, .fade-leave-active {
  transition: opacity .5s;
}
.fade-enter, .fade-leave-to {
  opacity: 0;
}
</style>

In the above code, we define an animation effect named fade through the transition tag and the .fade namespace. When show is true, the element is inserted into the document and displayed under the influence of the .fade-enter-active class and the .fade-enter class out; when show is false, the element will be removed from the document and used in the .fade-leave-active class and the .fade-leave class gradually disappear.

For example, we can add a button to the component to switch the value of the show variable to achieve insertion and removal animation of the element.

<template>
  <div>
    <button @click="show = !show">{{ show ? '隐藏' : '显示' }}</button>
    <transition name="fade">
      <p v-if="show">这是一个动画示例</p>
    </transition>
  </div>
</template>

<style>
.fade-enter-active, .fade-leave-active {
  transition: opacity .5s;
}
.fade-enter, .fade-leave-to {
  opacity: 0;
}
</style>

In the above code, we define a button and bind a click event to switch the value of show. When show is true, the element will appear, accompanied by the fade-in animation effect; when show is false, the element will gradually disappear, accompanied by the fade-out animation effect. .

In addition to the fade in and fade out effect, we can also use other animation effects, such as dynamic scaling, rotation, movement and other effects. We only need to set different CSS style classes. The following is a sample code to implement a rotation effect:

<template>
  <div>
    <button @click="show = !show">{{ show ? '隐藏' : '显示' }}</button>
    <transition name="rotate">
      <p v-if="show">这是一个动画示例</p>
    </transition>
  </div>
</template>

<style>
.rotate-enter-active {
  animation: rotate .5s ease-in-out;
}
.rotate-enter, .rotate-leave-to {
  opacity: 0;
  transform: rotate(0deg);
}
.rotate-leave-active {
  animation: rotate .5s ease-in-out reverse;
}
.rotate-enter-to, .rotate-leave {
  opacity: 1;
  transform: rotate(360deg);
}
@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
</style>

In the above code, we define an animation effect named rotate and use CSS3’s animation Attribute to achieve the rotation effect of the element. When an element is inserted, it is accompanied by a rotation effect; when an element is removed, it is rotated forward and then reversed before leaving.

Summary

The animation function in Vue.js 3.0 provides a very convenient way to achieve various animation effects, including fade in and fade out, scaling, rotation, movement and other effects. Developers can use According to actual needs, you can configure the corresponding style classes to achieve different animation effects. By using animation functions, we can achieve more gorgeous interactive effects and improve user experience.

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