v-for 双层循环dom拖拽功能

<div class="loopBlocks">
                <div v-for="(itemB, indexB) in itemA.questions" :key="indexB">
                  <div
                    :class="[
                      indexA == StyleIndexA && indexB == StyleIndexB
                        ? 'blockItemA'
                        : 'blockItemB',
                    ]"
                    draggable="true"
                    @dragstart="handleDragStart(indexA, indexB)"
                    @dragover="handleDragOver"