vue 中的动画

 1. 使用过渡类名

HTML结构:

 <div id="app">

<input type="button" value="动起来" @click="myAnimate">
  <!--
使用 transition 将需要过渡的元素包裹起来 -->
  <transition name="fade">
    <div v-show="isshow">
动画哦</div>
  </transition>
</div>

VM 实例:

// 创建 Vue 实例,得到 ViewModel

var vm = new Vue({
el: '#app',
data: {
  isshow: false
},
methods: {
  myAnimate() {
    this.isshow = !this.isshow;
  }
}
 

定义两组类样式:

/* 定义进入和离开时候的过渡状态 */

  .fade-enter-active,
  .fade-leave-active {
    transition: all 0.2s ease;
    position: absolute;
  }

  /* 定义进入过渡的开始状态
离开过渡的结束状态 */
  .fade-enter,
  .fade-leave-to {
    opacity: 0;
    transform: translateX(100px);
  }

案例:注意未起名默认是v

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title></title>
  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
  <script src="https://unpkg.com/vue-router@3.0.0/dist/vue-router.js"></script>
  <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
  <style>
    #app {
      position: relative;
    }
    .circle {
      font-size: 50px;
      color: red;
    }
    #keng {
      color: aqua;
      font-size: 200px;
      position: absolute;
      top: 350px;
      left: 225px;
      width: 50px;
      height: 50px;
    }
    .v-leave {
      transform: translate(0px, 0px);
    }
    .v-leave-to {
      transform: translate(300px, 500px);
    }
    .v-leave-active {
      transition: all 2s;
    }
    .pool-enter-active,.pool-leave-active{
            transition: all 2s;
        }
  </style>
</head>
<body>
  <body>
    <div id='app'>
      <button @click="flag = !flag">加入购物车</button>
      <transition >
        <div class="circle" v-show="flag">☀</div>
      </transition>
      <transition name="pool">
        <div id="keng" v-show="flag">🕳</div>
      </transition>
    </div>
    <script>
      const vm = new Vue({
        el: '#app',
        data: {
          flag: true,
        },
        methods: {
          
        },
      })
    </script>
  </body>
</body>
</html>

 2.使用第三方css动画库

<link href="https://cdn.bootcdn.net/ajax/libs/animate.css/4.1.1/animate.min.css" rel="stylesheet">

上面引入版本是4以上时的案例:

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title></title>
  <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

    //4以上的版本需要加animate__

  <link href="https://cdn.bootcdn.net/ajax/libs/animate.css/4.1.1/animate.min.css" rel="stylesheet">
</head>
<body>
  <div id='app'>
    <button @click="show = !show">
      阿斯塔特
    </button>
    <transition name="custom-classes-transition" enter-active-class="animate__animated animate__zoomOutDown"
      leave-active-class="animated bounceOutRight">
      <p v-if="show">第一军团没有秘密</p>
    </transition>
  </div>
  <script>
    const vm = new Vue({
      el: '#app',
      data: {
        show: true
      },
      methods: {
      },
    })
  </script>
</body>
</html>

<link href="https://cdn.bootcdn.net/ajax/libs/animate.css/3.1.1/animate.min.css" rel="stylesheet">

上面引入版本是4以下时的案例:

 

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title></title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>


    <link href="https://cdn.jsdelivr.net/npm/animate.css@3.5.1" rel="stylesheet" type="text/css">
</head>
<body>
    <div id='app'>

        <button @click="show = !show">
            Toggle render
          </button>
          <transition
            name="custom-classes-transition"
            enter-active-class="animated slideInRight"
            leave-active-class="animated bounceOutRight"
          >
            <p v-if="show">hello</p>
          </transition>
    </div>


    <script>
    const vm = new Vue({
        el: '#app',
        data: {
            show: true
        },
        methods: {
        },
    })
    </script>
</body>
</html>

3.使用动画钩子函数 

定义 transition 组件以及三个钩子函数:

<div id="app">

  <input type="button" value="切换动画" @click="isshow = !isshow">
  <transition
  @before-enter="beforeEnter"
  @enter="enter"
  @after-enter="afterEnter">
    <div v-if="isshow" class="show">OK</div>
  </transition>
</div>

定义三个 methods 钩子方法:

methods: {

      beforeEnter(el) { // 动画进入之前的回调
        el.style.transform = 'translateX(500px)';
      },
      enter(el, done) { // 动画进入完成时候的回调

        el.offsetWidth;
        el.style.transform = 'translateX(0px)';
        done();
      },
      afterEnter(el) { // 动画进入完成之后的回调

        this.isshow = !this.isshow;
      }

}

定义动画过渡时长和样式:

.show{

transition: all 0.4s ease;

}

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title></title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script src="https://unpkg.com/vue-router@3.0.0/dist/vue-router.js"></script>
    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>

    <style>
        .show{
                transition: all 0.4s ease;
            }
    </style>
</head>

<body>
    <div id='app'>
        <input type="button" value="切换动画" @click="isshow = !isshow">
        <transition @before-enter="beforeEnter" @enter="enter" @after-enter="afterEnter">
            <div v-if="isshow" class="show">OK</div>
            <div>121</div>
        </transition>
    </div>
    <script>
        const vm = new Vue({
            el: '#app',
            data: {
                isshow:true
            },
            methods: {
                beforeEnter(el) { // 动画进入之前的回调
                    el.style.color = 'red'
                    el.style.transform = 'translateX(500px)';
                },
                enter(el, done) { // 动画进入完成时候的回调
                    // 这个需要加
                    el.offsetWidth;
                    el.style.transform = 'translateX(0px)';
                    // 这个方法表示完成
                    done();
                },
                afterEnter(el) { // 动画进入完成之后的回调
                    // this.isshow = !this.isshow;
                }
            }
        })
    </script>
</body>

</html>

4.v-for的列表过渡

 定义过渡样式:

<style>

  .list-enter,
  .list-leave-to {
    opacity: 0;
    transform: translateY(10px);
  }

  .list-enter-active,
  .list-leave-active {
    transition: all 0.3s ease;
  }
</style>

定义DOM结构,其中,需要使用 transition-group 组件把v-for循环的列表包裹起来:

<div id="app">

  <input type="text" v-model="txt" @keyup.enter="add">
  <transition-group tag="ul" name="list">
    <li v-for="(item, i) in list" :key="i">{{item}}</li>
  </transition-group>
</div>

定义 VM中的结构:

  // 创建 Vue 实例,得到 ViewModel

  var vm = new Vue({
    el: '#app',
    data: {
      txt: '',
      list: [1, 2, 3, 4]
    },
    methods: {
      add() {
        this.list.push(this.txt);
        this.txt = '';
      }
    }
  });
 

案例:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title></title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <style>
        .v-enter{
            transform: translateX(-200px);
        }
        .v-enter-to{
            transform: translateX(0px);
        }
        .v-enter-active{
            transition: all 2s;
        }
        .v-leave{
            transform: translateX(0px); 
        }
        .v-leave-to{
            transform: translateX(200px);
        }
        .v-leave-active{
            transition: all 2s;
        }
        .box{
            width: 500px;
            margin: auto;
        }

        .v-move{
        transition: all 0.8s ;
        }
        .v-leave-active{
        position: absolute;
        }
        .v-enter-active{
        position: absolute;
        }
    </style>
</head>
<body>
    <div id='app'>
        <button @click="flag = !flag"> 点我</button>
        <button @click="changeList"> 点我2</button>
        <transition-group tag="ul">
            <div class="box" v-if="flag"  v-for="item in list" :key="item">
                {{item}}
            </div>
        </transition-group>


    </div>


    <script>
    const vm = new Vue({
        el: '#app',
        data: {
            flag:true,
            list:[4,5,6,7,8,9]
        },
        methods: {
            changeList(){
                this.list.push(this.list[this.list.length-1] + 1)
            }
        },
    })
    </script>
</body>
</html>

5.列表的排序过渡

<transition-group> 组件还有一个特殊之处。不仅可以进入和离开动画,还可以改变定位。要使用这个新功能只需了解新增的 v-move 特性,它会在元素的改变定位的过程中应用。

v-move v-leave-active 结合使用,能够让列表的过渡更加平缓柔和:

.v-move{

transition: all 0.8s ease;
}
.v-leave-active{
position: absolute;
}

 

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