2026-06-15

标签拆分浮点精度问题

src/views/modules/label-split-merge/labelSplitMerge.vue

@@ -89,7 +89,7 @@
               <el-input v-model="splitQuantity" placeholder="请输入每张数量" type="number" class="split-input inlineNumber numInput"/>
             </div>
             <div class="split-info-row" v-if="splitCount > 0 && splitQuantity > 0">
-              <span class="split-info-text">拆分后：原标签剩余 {{ calculateRemainingQty }} 个，新增 {{ splitCount }} 张标签，每张 {{ splitQuantity }} 个</span>
+              <span class="split-info-text">拆分后：原标签剩余 {{ calculateRemainingQty }} 个，新增 {{ splitCount }} 张标签，每张 {{ formatDisplayQty(splitQuantity) }} 个</span>
             </div>
           </div>
         </div>
@@ -215,10 +215,7 @@ export default {
     confirmSplit() {
       if (this.isSplitting) return;
 
-      const splitCnt = parseInt(this.splitCount);
-      const splitQty = parseFloat(this.splitQuantity);
-      const currentQty = parseFloat(this.currentLabel.qtyOnHand);
-      const totalSplitQty = splitCnt * splitQty;
+      const { splitCnt, splitQty, currentQty, remainingQty } = this.getSplitCalculation();
 
       if (!splitCnt || splitCnt <= 0) {
         this.$message.warning('请输入有效的拆分张数');
@@ -228,7 +225,7 @@ export default {
         this.$message.warning('请输入有效的每张数量');
         return;
       }
-      if (totalSplitQty >= currentQty) {
+      if (remainingQty <= 0) {
         this.$message.warning('拆分总数量必须小于当前数量');
         return;
       }
@@ -505,25 +502,41 @@ export default {
         // 执行打印
         LODOP.PRINT();
       }
+    },
+    formatDisplayQty(value) {
+      const num = Number(value);
+      if (!Number.isFinite(num)) {
+        return '0';
+      }
+      // 保留最多6位小数并去除末尾0，避免展示浮点尾差
+      return Number(num.toFixed(6)).toString();
+    },
+    getSplitCalculation() {
+      const splitCnt = parseInt(this.splitCount, 10) || 0;
+      const splitQty = parseFloat(this.splitQuantity) || 0;
+      const currentQty = parseFloat(this.currentLabel.qtyOnHand) || 0;
+      const totalSplitQty = this.decimalUtil.mul(splitCnt, splitQty);
+      const remainingQty = this.decimalUtil.sub(currentQty, totalSplitQty);
+      return {
+        splitCnt,
+        splitQty,
+        currentQty,
+        totalSplitQty,
+        remainingQty
+      };
     }
   },
 
   computed: {
     // 计算拆分后剩余数量
     calculateRemainingQty() {
-      const currentQty = parseFloat(this.currentLabel.qtyOnHand) || 0;
-      const splitCnt = parseInt(this.splitCount) || 0;
-      const splitQty = parseFloat(this.splitQuantity) || 0;
-      const totalSplitQty = splitCnt * splitQty;
-      return currentQty - totalSplitQty;
+      const { remainingQty } = this.getSplitCalculation();
+      return this.formatDisplayQty(remainingQty);
     },
     // 判断是否可以拆分
     canSplit() {
-      const splitCnt = parseInt(this.splitCount) || 0;
-      const splitQty = parseFloat(this.splitQuantity) || 0;
-      const currentQty = parseFloat(this.currentLabel.qtyOnHand) || 0;
-      const totalSplitQty = splitCnt * splitQty;
-      return splitCnt > 0 && splitQty > 0 && totalSplitQty < currentQty;
+      const { splitCnt, splitQty, remainingQty } = this.getSplitCalculation();
+      return splitCnt > 0 && splitQty > 0 && remainingQty > 0;
     }
   },