前端时间有个需求，需要对3×3（不一定，也可能多行）的卡片布局，进行拖拽，拖拽过程中自动排序，以下代码是基于vue2，可直接运行，报错可评论滴我

部分代码优化来自于GPT4o和Claude：官方直连GPT/Claude

代码如下：

<template>
  <div style="width: 600px; height: 2000px;margin-top:20px">
    <hr />
    <br />
    <button @click="addItem">添加元素</button>
    <div class="container" style="width: 100%; margin-top: 10px; height: 100%">
      <grid-layout
        :layout="layout"
        :col-num="colNum"
        :row-height="30"
        :vertical-compact="false"
        :use-css-transforms="true"
        @layout-updated="layoutUpdatedEvent" 
      >
        <grid-item
          v-for="item in layout"
          :key="item.i"
          :x="item.x"
          :y="item.y"
          :w="item.w"
          :h="item.h"
          :i="item.i"
        >
          <span class="text">{{ item.scene }}</span>
        </grid-item>
      </grid-layout>
    </div>
  </div>
</template>

<script>
import { GridLayout, GridItem } from "vue-grid-layout";
export default {
  components: {
    GridLayout,
    GridItem,
  },
  data() {
    return {
      layout: [
        { x: 0, y: 0, w: 1, h: 2, i: "0", scene: "场景1"},
        { x: 1, y: 0, w: 1, h: 2, i: "1", scene: "场景2"},
        { x: 2, y: 0, w: 1, h: 2, i: "2", scene: "场景3"},
        { x: 0, y: 2, w: 1, h: 2, i: "3", scene: "场景4"},
        { x: 1, y: 2, w: 1, h: 2, i: "4", scene: "场景5"},
        { x: 2, y: 2, w: 1, h: 2, i: "5", scene: "场景6"},
        // { x: 2, y: 1, w: 1, h: 2, i: "6", scene: "场景7"},
        // { x: 3, y: 1, w: 1, h: 2, i: "7", scene: "场景8"},
        // { x: 0, y: 2, w: 1, h: 2, i: "8", scene: "场景9"}
      ],
      draggable: true,
      resizable: false,
      responsive: true,
      colNum: 3,
      index: 0,
      initialized:false,
      isUpdating: false,
      layoutCopy: []
    };
  },
  mounted() {
    this.index = this.layout.length;
  },
  methods: {
    layoutUpdatedEvent(newLayout) {
      if (!this.isUpdating) {
        this.isUpdating = true;
        this.rearrangeLayout(newLayout);
        this.$nextTick(() => {
          this.isUpdating = false;
        });
      }
    },
    rearrangeLayout(layout) {
        // 创建 layout 的深拷贝，防止修改原始数据
        let newLayout = layout;
        // 按 y 和 x 排序
        newLayout.sort((a, b) => a.y - b.y || a.x - b.x);
        // 重新排列布局
        for (let i = 0; i < newLayout.length; i++) {
          newLayout[i].x = (i % 3) * 1;
          newLayout[i].y = Math.floor(i / 3)*newLayout[i].h;
        }
        this.layout= newLayout;
      },
        addItem(){
            // Add a new item. It must have a unique key!
            this.layout.push({
                x: (this.layout.length * 1) % (this.colNum || 12),// q:为什么* 2 a:因为每个元素的宽度是2
                y: this.layout.length + (this.colNum || 12), // puts it at the bottom
                w: 1,
                h: 2,
                i: this.index,
                scene: `场景${this.layout.length + 1}`
            });
            console.log(this.layout,"this.layout");
            // Increment the counter to ensure key is always unique.
            this.index++;
        },
        removeItem(){
            const index = this.layout.map(item => item.i).indexOf(val);
            this.layout.splice(index, 1);
        },
  }
};
</script>

<style>
.container .vue-grid-item.vue-grid-placeholder {
  background: none;
  border: #00893d dashed 2px;
}
.vue-grid-layout {
  background: #eee;
}
.vue-grid-item:not(.vue-grid-placeholder) {
  background: #00893d;
  border: 1px solid #00893d;
}
.vue-grid-item .resizing {
  opacity: 0.9;
}
.vue-grid-item .static {
  background: #cce;
}
.vue-grid-item .text {
  font-size: 24px;
  text-align: center;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  height: 100%;
  width: 100%;
  color: #FFF;
}
.vue-grid-item .no-drag {
  height: 100%;
  width: 100%;
}
.vue-grid-item .minMax {
  font-size: 12px;
}
.vue-grid-item .add {
  cursor: pointer;
}
.vue-draggable-handle {
  position: absolute;
  width: 20px;
  height: 20px;
  top: 0;
 left: 0;
  background-position: bottom right;
  padding: 0 8px 8px 0;
  background-repeat: no-repeat;
  background-origin: content-box;
  box-sizing: border-box;
  cursor: pointer;
}
.layoutJSON {
  background: #ddd;
  border: 1px solid #00893d;
  margin-top: 10px;
  padding: 10px;
}
.columns {
  -moz-columns: 120px;
  -webkit-columns: 120px;
  columns: 120px;
}
</style>