拖拽（高度自定义）

思路:
监听鼠标按下事件，监听在移动时计算它的高度和上面div盒子的高度
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demo

<template>
  <div style="width: 100%;">
    <div
      ref="DrawerBody"
      class="drawer-body"
    >
      <div>11</div>
      <div>11</div>
      <div>11</div>
      <div>11</div>
      <div>11</div>
      <div>11</div>
      <div>11</div>
      <div>11</div>
      <div>11</div>
      <div>11</div>
      <div>11</div>
      <div>11</div>
      <div>11</div>
    </div>
    <div
      ref="DrawerBottom"
      class="drawer-bottom"
    >
      <div
        ref="DrawerBottomBar"
        class="drawer-bottom-bar"
      >
        <div class="drawer-bottom-bar-true" />
      </div>
      <div class="drawer-bottom-body">
        1111
      </div>
    </div>
  </div>
</template>
<script lang="ts" setup>

import { onMounted, ref } from 'vue'

const DrawerBottomBar = ref<any>(null)
const DrawerBottom = ref<any>(null)
const DrawerBody = ref<any>(null)
onMounted(() => {
  DrawerBottomBar.value.onmousedown = (e: any) => {
    const oldHeight = DrawerBottom.value.offsetHeight
    const startY = e.clientY
    document.onmousemove = (e) => {
      console.log(e)
      // 当前鼠标Y值
      const endY = e.clientY
      // 当前鼠标在Y轴移动的距离
      const distance = endY - startY
      // left-top当前高度
      const newHeight = oldHeight - distance
      // 设置dom样式
      DrawerBottom.value.style.height = `${newHeight}px`

      DrawerBody.value.style['padding-bottom'] = `${newHeight}px`
    }
    document.onmouseup = () => {
      document.onmousemove = null
      document.onmouseup = null
    }
    return false
  }
})
</script>
  <style scoped lang="scss">
  .drawer {
   position: relative;
   &-body {
    background: #fafafa;
    padding: 0 24px;
    width: 100%;
    font-family: "Inter";
    height: calc(100vh - 86px);
    overflow: auto;
    &::-webkit-scrollbar {
     display: none; /* Chrome Safari */
    }
   }
   &-bottom {
    width: 100%;
    position: absolute;
    z-index: 10;
    bottom: 0;
    background: #fff;
    height: 360px;
    border-top: 1px solid #e5e6eb;
    box-shadow: 0px -4px 12px rgba(0, 0, 0, 0.12);
    &-bar {
     &-true {
      height: 4px;
      border-radius: 4px;
      background: rgba(0, 0, 0, 0.32);
     }
     cursor: ns-resize;
     position: absolute;
     left: 50%;
     margin-left: -20%;
     top: -20px;
     width: 40%;
     padding: 10px 0;
    }
   }
  }
  </style>

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