写一个在vue中拖拽div盒子的边框可以改变它的大小的代码

好的，这是一个简单的可以在Vue中拖拽div盒子边框改变大小的代码：

<template>
  <div class="dragbox" :style="{ width: width + 'px', height: height + 'px', left: left + 'px', top: top + 'px' }" ref="box" @mousedown="startDrag">
    <div class="dragbox-border top" @mousedown="startResize('top')"></div>
    <div class="dragbox-border right" @mousedown="startResize('right')"></div>
    <div class="dragbox-border bottom" @mousedown="startResize('bottom')"></div>
    <div class="dragbox-border left" @mousedown="startResize('left')"></div>
    <div class="dragbox-content">
      <!-- 你的div盒子内容 -->
    </div>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        left: 0,
        top: 0,
        width: 200,
        height: 200,
        startX: 0,
        startY: 0,
        startLeft: 0,
        startTop: 0,
        resizing: false,
        resizeDirection: ''
      };
    },
    methods: {
      startDrag(event) {
        event.preventDefault();

        this.startX = event.clientX;
        this.startY = event.clientY;
        this.startLeft = this.left;
        this.startTop = this.top;
        this.resizing = false;

        document.addEventListener('mousemove', this.drag);
        document.addEventListener('mouseup', this.stopDrag);
      },

      drag(event) {
        event.preventDefault();

        const deltaX = event.clientX - this.startX;
        const deltaY = event.clientY - this.startY;

        this.left = this.startLeft + deltaX;
        this.top = this.startTop + deltaY;
      },

      stopDrag(event) {
        document.removeEventListener('mousemove', this.drag);
        document.removeEventListener('mouseup', this.stopDrag);
      },

      startResize(direction) {
        event.preventDefault();

        this.startX = event.clientX;
        this.startY = event.clientY;
        this.startWidth = this.width;
        this.startHeight = this.height;
        this.resizing = true;
        this.resizeDirection = direction;

        document.addEventListener('mousemove', this.resize);
        document.addEventListener('mouseup', this.stopResize);
      },

      resize(event) {
        event.preventDefault();

        const deltaX = event.clientX - this.startX;
        const deltaY = event.clientY - this.startY;

        if (this.resizeDirection === 'left') {
          this.width = this.startWidth - deltaX;
          this.left = this.startLeft + deltaX;
        }

        if (this.resizeDirection === 'top') {
          this.height = this.startHeight - deltaY;
          this.top = this.startTop + deltaY;
        }

        if (this.resizeDirection === 'right') {
          this.width = this.startWidth + deltaX;
        }

        if (this.resizeDirection === 'bottom') {
          this.height = this.startHeight + deltaY;
        }
      },

      stopResize(event) {
        document.removeEventListener('mousemove', this.resize);
        document.removeEventListener('mouseup', this.stopResize);
      }
    }
  };
</script>

<style scoped>
  .dragbox {
    position: absolute;
    border: 1px solid black;
    cursor: move;
  }

  .dragbox-border {
    position: absolute;
    width: 10px;
    height: 10px;
    background-color: black;
    opacity: 0.5;
    cursor: pointer;
  }

  .dragbox-border.top {
    top: -5px;
    left: 50%;
    transform: translateX(-50%);
  }

  .dragbox-border.right {
    top: 50%;
    right: -5px;
    transform: translateY(-50%);
  }

  .dragbox-border.bottom {
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
  }

  .dragbox-border.left {
    top: 50%;
    left: -5px;
    transform: translateY(-50%);
  }

  .dragbox-content {
    padding: 10px;
  }
</style>