<template>
  <section class="fixed-icon"
       :style="{ bottom: bottom + 'rem' }"
       :class="[ !transition "
       @click="event">
    <slot></slot>
  </section>
</template>
<script>
 export default {
  name: 'fixedIcon',
  props: {
   bottom: { // 改图标距离底部距离 单位 rem
    type: Number,
    default: 3,
   },
  },
  data () {
   return {
    transition: true, // 是否触发动画
    timer: null, // 定时器
   };
  },
  methods: {
   event() {
    this.$emit('clickEvent'); // 绑定点击图表时间
   },
   handleScroll () { // 每次滑动都会执行函数
    this.transition = false;
    if (this.timer) { // 判断是否已存在定时器
     clearTimeout(this.timer);
    }
    this.timer = setTimeout(() => { // 创建定时器，1.4s后图标回归原位置
     this.transition = true;
    }, 1400);
   }
  },
  mounted () {
   window.addEventListener('scroll', this.handleScroll); // 监听页面滑动
  }
 };
</script>

<style scoped lang="scss">
  /*@media only screen and (min-width:750px){html{font-size:20px}} */
  .fixed-icon{
    position: fixed;
    z-index: 1100;
    right: 1.7rem;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 4.1rem;
    width: 4.1rem;
    border-radius: 50%;
    background-color: rgba(128, 128, 128, 0.8);
    transition: 0.7s ease-in-out;
  }
  .fixed-transition{
    right: -2.05rem;
    opacity: 0.4;
    transition: 1s ease-in-out;
  }
</style>

<template>
  <section class="content">
    <fixed-icon :bottom="3" @clickEvent="chat">
      <i class="icon-chat"></i>
    </fixed-icon>
  </section>
</template>

<script>
 import fixedIcon from './components/fixedIcon.vue';

 export default {
  name: 'test',
  components: {
   fixedIcon
  },
  data () {
   return {
   };
  },
  methods: {
   chat() { // 图标点击事件
    console.log('你好');
   },
  },
  mounted() {
   document.title = 'Vue制作固定定位图标滑动隐藏效果';
  },
 };
</script>

<style scoped lang="scss">
  .content{
    height: 200vh;
  }
  .icon-chat{
    width: 2rem;
    height: 1.9rem;
    background: url('http://pfpdwbdfy.bkt.clouddn.com/image/test/fixedIconTranstion/wechat.png') no-repeat;
    background-size: 2rem 1.9rem;
  }
</style>