bug修复

src/views/OrderDetails.vue

@@ -36,12 +36,13 @@
               </div>
               <div class="item_c_r_price">
                 <div
+                  v-if="form.productDataJosn"
                   class="item_c_r_price_r font22"
                   @click="openPurchaseNotes(form.productDataJosn)"
                 >
                   <span>购买须知</span> <van-icon name="arrow" />
                 </div>
-                <div class="item_c_r_price_r">X{{ form.buyQuantity }}</div>
+                <div class="item_c_r_price_r" v-if="form.buyQuantity != null">X{{ form.buyQuantity }}</div>
                 <div class="item_c_r_price_l" v-if="form.sellingPrice">
                   <span>{{ form.sellingPrice.split(".")[0] }}</span
                   >.{{ form.sellingPrice.split(".")[1] }}