写一个在vue3中拖拽div边框可以调整盒子大小的代码

好的，我可以为您提供示例代码。以下是一个在vue3中实现拖拽div边框调整盒子大小的示例代码：

<template>
  <div class="resize-container" @mousedown="startResize">
    <div ref="box" class="resize-box"></div>
    <div class="resize-handler"></div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      isResizing: false,
      startX: null,
      startWidth: null
    };
  },
  methods: {
    startResize(e) {
      this.isResizing = true;
      this.startX = e.clientX;
      this.startWidth = this.$refs.box.offsetWidth;
      document.addEventListener("mousemove", this.resize);
      document.addEventListener("mouseup", this.stopResize);
    },
    resize(e) {
      if (!this.isResizing) return;
      const width = this.startWidth + (e.clientX - this.startX);
      this.$refs.box.style.width = `${width}px`;
    },
    stopResize() {
      this.isResizing = false;
      document.removeEventListener("mousemove", this.resize);
      document.removeEventListener("mouseup", this.stopResize);
    }
  }
};
</script>

<style>
.resize-container {
  position: relative;
  width: 500px;
  height: 300px;
  border: 1px solid #ccc;
}

.resize-box {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #f8f8f8;
}

.resize-handler {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 20px;
  height: 20px;
  background-color: #ccc;
  cursor: se-resize;
}
</style>

您可以将以上代码复制到您的vue组件中，并根据需要进行修改。希望能帮助到您！