vue+elementUI+transition实现鼠标滑过div展开内容，鼠标划出收起内容，加防抖功能

文章目录

一、场景
二、实现代码
- 1.子组件代码结构
- 2.父组件

一、场景

这两天做项目，此产品提出需求要求详情页的顶部区域要在鼠标划入后展开里面的内容，鼠标划出要收起部分内容，详情底部的内容高度要自适应，我这里运用了鼠标事件+transition实现，加上lodash debounce进行防抖，下面是具体实现代码

二、实现代码

1.子组件代码结构

代码如下（示例）：

javascript 复制代码

<template>
  <div
    class="project-header"
    @mouseenter="enterFun()"
    @mouseleave="leaveFun()"
    ref="project-header"
  >
    <div class="project-header-top">
    顶部要显示的部分
    </div>
    <div class="bottom" v-show="showProjectHeaderBottom">
    顶部要隐藏的部分，鼠标划入显示
    </div>
  </div>
</template>

<script>
import { debounce } from 'lodash';//npm install lodash引入
export default {
  name: '',
  components: {},
  props: {
  },
  data() {
    return {
      showProjectHeaderBottom: false,//控制顶部要隐藏的显隐
    };
  },
  methods: {
    // 鼠标滑过
    enterFun:debounce(function(){
      this.showProjectHeaderBottom = true;
      this.$emit('getHeight', 'hover');
    },100),
    // 鼠标划出
    leaveFun:debounce(function(){
      this.showProjectHeaderBottom = false;
      this.$emit('getHeight', null);
    },100),
  },
};
</script>
<style lang="scss" scoped>
.project-header {
  height: 68px;
}
</style>

2.父组件

代码如下（示例）：

c 复制代码

<template>
  <div class="project-detail" ref="project-browse" >
    <Header
      ref="project-detail-top"
      class="project-detail-top"
      @getHeight="getHeight"
    >
    </Header>
    <div class="tab-content" style="position: relative" ref="tab-content">
    </div>
  </div>
</template>

<script>
import Header from './components/detailHeader.vue';
export default {
  name: '',
  components: {  Header},
  props: {},
  data() {
  },
  methods: {
    mountedInit() {
     this.getHeaderheight();
      window.addEventListener('resize', this.getHeaderheight);
    },
    getHeaderheight(type) {
      this.$nextTick(() => {
        let projectHeader = type === 'hover' ? 208 : 60;
        document.querySelector('.tab-content .el-tabs__content').style.overflow = type === 'hover' ? 'hidden' : 'auto';
        let height = this.$refs['project-browse']?.offsetHeight - projectHeader;
        this.$refs['tab-content'].style.height = height + 'px';//自适应
        this.$refs["project-detail-top"].$el.style.height=projectHeader+ 'px';
      });
    },

  },
  created() {
    this.createdInit();
  },
  mounted() {
    this.mountedInit();
  },
};
</script>
<style lang="scss" scoped>
.project-detail-top {
  transition: height 0.2s ease-in-out;
  overflow: hidden;
}
</style>