Vue.js实现文字超出指定高度后展开收起功能

<template>
  <div :class="{'overflow-hidden': !isShowMore}">
    <slot></slot>
    <span
      v-if="isShowMore"
      class="link"
      @click="handleHideMoreClick"
    >
      收起</span>
    <span
      v-else
      class="show-more-btn"
      @click="handleShowMoreClick"
    >
      <span>
        ...</span>
      <span class="link">
        展开</span>
    </span>
  </div>
</template>
<script>
// created at 2021-09-23
export default {
  name: 'TextOverflow',
  data() {
    return {
      isShowMore: false,
    };
  },
  methods: {
    handleShowMoreClick() {
      this.isShowMore = true;
    },
    handleHideMoreClick() {
      this.isShowMore = false;
    },
  }
};
</script>
<style>
.overflow-hidden {
  position: relative;
  overflow: hidden;
}
.show-more-btn {
  position: absolute;
  display: block;
  right: 0;
  bottom: 0;
  width: 70px;
  text-align: right;
  /* 背景从透明到白色，过渡 */
  background-image: linear-gradient(to right, transparent, #ffffff 26.4%);
}
.link {
  color: #409eff;
  cursor: pointer;
}
</style>

<template>
  <div class="">
    <TextOverflow class="content">这是一段文字,文字的效果是这样的，超出部分默认会被隐藏，如果点击展开会显示全部内容</TextOverflow>
  </div>
</template>
<script>
import TextOverflow from './TextOverflow.vue';
// created at 2021-09-23
export default {
  name: 'App',
  props: {},
  components: {
    TextOverflow,
  },
  data() {
    return {};
  },
  computed: {},
  methods: {
    async getData() {},
  },
  created() {
    this.getData();
  },
};
</script>
<style >
.content {
  width: 200px;
  line-height: 20px;
  /* 设置为行高的整倍数，此处显示两行: 2 * 20px */
  max-height: 40px;
}
</style>