<template>
<div class="box">
  <h1>vuejs之css過渡與css動畫</h1>
  <p class="p">
  過渡的類名  
    在進(jìn)入/離開的過渡中，會有 6 個(gè) class 切換矢洲。 <br>
v-enter：定義進(jìn)入過渡的開始狀態(tài)蝗敢。在元素被插入之前生效，在元素被插入之后的下一幀移除。<br>
v-enter-active：定義進(jìn)入過渡生效時(shí)的狀態(tài)嘀倒。在整個(gè)進(jìn)入過渡的階段中應(yīng)用采盒，在元素被插入之前生效，在過渡/動畫完成之后移除兼砖。這個(gè)類可以被用來定義進(jìn)入過渡的過程時(shí)間奸远，延遲和曲線函數(shù)。<br>
v-enter-to: 2.1.8版及以上 定義進(jìn)入過渡的結(jié)束狀態(tài)讽挟。在元素被插入之后下一幀生效 (與此同時(shí) v-enter 被移除)懒叛，在過渡/動畫完成之后移除。<br>
v-leave: 定義離開過渡的開始狀態(tài)耽梅。在離開過渡被觸發(fā)時(shí)立刻生效薛窥，下一幀被移除。<br>
v-leave-active：定義離開過渡生效時(shí)的狀態(tài)眼姐。在整個(gè)離開過渡的階段中應(yīng)用诅迷，在離開過渡被觸發(fā)時(shí)立刻生效，在過渡/動畫完成之后移除众旗。這個(gè)類可以被用來定義離開過渡的過程時(shí)間罢杉，延遲和曲線函數(shù)。<br>
v-leave-to: 2.1.8版及以上 定義離開過渡的結(jié)束狀態(tài)贡歧。在離開過渡被觸發(fā)之后下一幀生效 (與此同時(shí) v-leave 被刪除)滩租，在過渡/動畫完成之后移除拱镐。
  </p>

  <hr>

  <div id="demo">
    單元素/組件的過渡
    <button v-on:click="show = !show">
      顯示 / 隱藏
    </button>
    <transition name="fade">
      <p v-if="show">hello</p>
    </transition>
  </div>

  <hr>

  <div id="example-1">
    CSS 過渡
    <button @click="show1 = !show1">
      Toggle render
    </button>
    <transition name="slide-fade">
      <p v-if="show1">hello</p>
    </transition>
  </div>

  <hr>

  <div id="example-2">
    CSS 動畫
    <button @click="show3 = !show3">Toggle show</button>
    <transition name="bounce">
      <p v-if="show3">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris facilisis enim libero, at lacinia diam fermentum id. Pellentesque habitant morbi tristique senectus et netus.</p>
    </transition>
  </div>

  <hr>

  <div id="list-complete-demo" class="demo">
    列表的排序過渡
    <button v-on:click="shuffle">Shuffle</button>
    <button v-on:click="add">Add</button>
    <button v-on:click="remove">Remove</button>
    <transition-group name="list-complete" tag="p">
      <span
        v-for="item in items"
        v-bind:key="item"
        class="list-complete-item"
      >
        {{ item }}
      </span>
    </transition-group>
  </div>
</div>
</template>

<script>
export default {
  data () {
    return {
      show: true,
      show3: true,
      show1: true,
      items: [1, 2, 3, 4, 5, 6, 7, 8, 9],
      nextNum: 10
    }
  },
  methods: {
    change: function () {
      for (var i = 1; i < 4; i++) {
        this['box_' + i] = Math.random() > 0.5
      }
    },
    randomIndex: function () {
      return Math.floor(Math.random() * this.items.length)
    },
    add: function () {
      this.items.splice(this.randomIndex(), 0, this.nextNum++)
    },
    remove: function () {
      this.items.splice(this.randomIndex(), 1)
    },
    shuffle: function () {
      // this.items = _.shuffle(this.items)
    }
  }
}
</script>

<style scoped lang="scss">
html,.box{
  width: 100%;
  height: 100%;
  min-height: 960px;
  box-sizing: border-box; 
  background: url('http://online.jd.yumc.pw/_nuxt/img/bgFrontLogin.404f3ee.png') no-repeat;
  background-position: center 0;
  background-size: cover;
  hr{
    margin:30px 0;
  }
  .p{
    text-align: left;
    padding-left:20%;
  }
}
.fade-enter-active, .fade-leave-active {
  transition: opacity .5s;
}
.fade-enter, .fade-leave-to /* .fade-leave-active below version 2.1.8 */ {
  opacity: 0;
}


/* 可以設(shè)置不同的進(jìn)入和離開動畫 */
/* 設(shè)置持續(xù)時(shí)間和動畫函數(shù) */
.slide-fade-enter-active {
  transition: all .3s ease;
}
.slide-fade-leave-active {
  transition: all .8s cubic-bezier(1.0, 0.5, 0.8, 1.0);
}
.slide-fade-enter, .slide-fade-leave-to
/* .slide-fade-leave-active for below version 2.1.8 */ {
  transform: translateX(10px);
  opacity: 0;
}


.bounce-enter-active {
  animation: bounce-in .5s;
}
.bounce-leave-active {
  animation: bounce-in .5s reverse;
}
@keyframes bounce-in {
  0% {
    transform: scale(0);
  }
  50% {
    transform: scale(1.5);
  }
  100% {
    transform: scale(1);
  }
}



.list-complete-item {
  transition: all 1s;
  display: inline-block;
  margin-right: 10px;
}
.list-complete-enter, .list-complete-leave-to
/* .list-complete-leave-active for below version 2.1.8 */ {
  opacity: 0;
  transform: translateY(30px);
}
.list-complete-leave-active {
  position: absolute;
}
</style>