核心在于监听鼠标的move来改变div的高度，抽成了组件

<template>
  <div ref="container" class="drag">
    <z-tooltip v-if="isShowIcon" effect="dark" content="格式化" placement="top-start">
      <div @click="handleClick">
        <c-icon icon-class="TextFormatwenbengeshi10" class-name="code-icon"></c-icon>
      </div>
    </z-tooltip>
    <div class="bottom" :style="{ height: bottomHeight + 'px' }">
      <slot name="content"></slot>
    </div>
    <div ref="top" v-draggable class="top"></div>
  </div>
</template>

<script>
export default {
  name: 'Drag',
  directives: {
    draggable: {
      inserted(el) {
        el.style.cursor = 'ns-resize'
      }
    }
  },
  props: {
    minHeight: {
      type: Number,
      default: 85
    },
    maxHeight: {
      type: Number,
      default: 600
    },
    height: {
      type: Number,
      default: 85
    },
    isShowIcon: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      bottomHeight: 85 // 初始化底部div的高度
    }
  },
  watch: {
    height: {
      handler(val) {
        this.bottomHeight = val
        this.instance?.layout()
      },
      immediate: true,
      deep: true
    }
  },
  mounted() {
    this.dragControllerDiv()
  },
  methods: {
    dragControllerDiv() {
      const containerDiv = this.$refs.container
      const topDiv = this.$refs.top

      let startMouseY
      let startContainerHeight

      const mouseMoveHandler = e => {
        e.preventDefault()

        // 计算拖动距离
        const deltaY = e.clientY - startMouseY
        // 计算新的容器高度
        const newContainerHeight = startContainerHeight + deltaY

        // 高度限制
        const clampedHeight = Math.max(this.minHeight, Math.min(this.maxHeight, newContainerHeight))

        // 计算底部div的高度
        const newBottomHeight = clampedHeight - topDiv.offsetHeight
        this.$emit('move', newBottomHeight)
        // 更新底部div的高度
        this.bottomHeight = newBottomHeight
      }

      const mouseUpHandler = () => {
        document.removeEventListener('mousemove', mouseMoveHandler)
        document.removeEventListener('mouseup', mouseUpHandler)
      }

      topDiv.addEventListener('mousedown', e => {
        e.preventDefault()
        startMouseY = e.clientY
        startContainerHeight = containerDiv.offsetHeight + 10

        document.addEventListener('mousemove', mouseMoveHandler)
        document.addEventListener('mouseup', mouseUpHandler)
      })
    },
    handleClick() {
      console.log('121')
      this.$emit('up')
    }
  }
}
</script>

<style>
/* 拖拽相关样式 */
.drag {
  position: relative;
  width: 100%;
}

.top {
  position: absolute;
  bottom: 0;
  height: 2px;
  cursor: ns-resize;
  background-color: rgb(187 187 187);
  z-index: 100;
  width: calc(100% - 10px);
  left: 11px;
  &:hover {
    background-color: #3693ff;
    height: 3px;
  }
}

.bottom {
  height: auto;
  background-color: #fff;
  z-index: 100;
  width: 100%;
  overflow: hidden;
}
.code-icon {
  float: right;
  cursor: pointer;
}
</style>