优化数量控制：添加最少1项和最多99项的限制，显示相应提示

src/views/ServiceDetailsView.vue

 <template>
   <div class="service-details">
+    <!-- Toast notification -->
+    <div class="toast" v-if="showToast">{{ toastMessage }}</div>
+    
     <!-- Header with back arrow and title -->
     <div class="page-header">
       <button class="back-button">
@@ -123,6 +126,7 @@
               v-for="coupon in coupons" 
               :key="coupon.id"
               :class="{ active: selectedCoupon === coupon.id }"
+
               @click="toggleCoupon(coupon.id)"
             >
               <div class="coupon-info">
@@ -138,7 +142,7 @@
                   class="coupon-checkbox" 
                   :id="`coupon-${coupon.id}`"
                   :checked="selectedCoupon === coupon.id"
-                  @click.stop
+                  disabled="true"
                 />
                 <label :for="`coupon-${coupon.id}`" class="coupon-checkbox-label"></label>
               </div>
@@ -177,6 +181,27 @@ const discountCode = ref('')
 const showCoupons = ref(false)
 const selectedCoupon = ref(null)
 
+// Toast notification state
+const showToast = ref(false)
+const toastMessage = ref('')
+const toastTimeout = ref(null)
+
+// Show toast message
+const showToastMessage = (message) => {
+  toastMessage.value = message
+  showToast.value = true
+  
+  // Clear any existing timeout
+  if (toastTimeout.value) {
+    clearTimeout(toastTimeout.value)
+  }
+  
+  // Hide toast after 2 seconds
+  toastTimeout.value = setTimeout(() => {
+    showToast.value = false
+  }, 2000)
+}
+
 // Add-ons data - initial data for anytime
 const addons = ref([
   {
@@ -280,12 +305,20 @@ const updateAddonsByDate = () => {
   resetDiscountCode()
   // Update total price after resetting addons quantities
   updateTotalPrice()
+  
+  // Show toast message only if it's not initial load
+  if (!isInitialLoad.value) {
+    showToastMessage('1 更新班期价格\n2 重置数量选择\n3 重置优惠券部分数据\n4 更新价格接口')
+  }
+  isInitialLoad.value = false
 }
 
 // Price related state - initial values
-const originalPrice = ref(0) // Original price before discount
+const originalPrice = ref(998) // Original price before discount, default 998
 const discountAmount = ref(0) // Discount amount
-const totalPrice = ref(0) // Final price after discount
+const totalPrice = ref(998) // Final price after discount, default 998
+// Flag to track if it's initial load
+const isInitialLoad = ref(true)
 
 // Extract numeric price from price string
 const extractPrice = (priceString) => {
@@ -383,21 +416,36 @@ const updateAddonQuantity = (index, change) => {
     
     // If this is the last item with quantity >= 1 and we're trying to decrease it below 1
     if (totalItemsWithQuantity === 1 && currentQuantity <= 1) {
+      // Show toast message
+      showToastMessage('最少至少选中一项，禁止都变成0')
       // Don't allow decreasing - keep it at 1
       return
     }
   }
   
+  // Check if quantity exceeds maximum (99)
+  if (newQuantity > 99) {
+    // Show toast message
+    showToastMessage('最多99')
+    // Don't allow increasing beyond 99
+    addons.value[index].quantity = 99
+  } else {
     // Update quantity if valid
     addons.value[index].quantity = Math.max(0, newQuantity)
-  updateTotalPrice()
-  // Reset discount code result set when addon quantity changes
+    // Reset discount code first
     resetDiscountCode()
+    // Then update total price
+    updateTotalPrice()
+    // Show toast message when addon quantity changes
+    showToastMessage('1 重置优惠券部分\n2 更新价格接口')
+  }
 }
 
 // 打开弹层的函数
 const openPopup = () => {
   showPopup.value = true
+  // Show toast message when opening popup
+  showToastMessage('1 更新班期价格\n2 重置数量选择\n3 重置优惠券部分数据\n4 更新价格接口')
 }
 
 // 关闭弹层的函数
@@ -407,15 +455,16 @@ const closePopup = () => {
 
 // 切换优惠券选择状态 - 实现单选和取消选择
 const toggleCoupon = (couponId) => {
+  // 简化逻辑，直接切换选中状态
   if (selectedCoupon.value === couponId) {
-    // 如果当前优惠券已选中，取消选择
     selectedCoupon.value = null
   } else {
-    // 否则选中当前优惠券
     selectedCoupon.value = couponId
   }
   // 重新计算总价
   updateTotalPrice()
+  // Show toast message when toggling coupon selection
+  showToastMessage('1 更新优惠券数据\n2 更新价格接口')
 }
 
 // 应用折扣码的函数
@@ -426,6 +475,8 @@ const applyDiscount = () => {
     selectedCoupon.value = coupons.value[0].id
     // 联动价格更新
     updateTotalPrice()
+    // Show toast message when applying discount code
+    showToastMessage('1 更新优惠券数据\n2 更新价格接口')
   }
 }
 
@@ -796,28 +847,26 @@ const selectCoupon = (couponId) => {
 
 .discount-input {
   flex: 1;
-  padding: 12pt; /* 16px = 12pt */
+  padding: 10.5pt 12pt; /* 14px = 10.5pt, 16px = 12pt */
   border: 0.75pt solid #ddd; /* 1px = 0.75pt */
   border-radius: 8pt; /* 10px = 8pt */
-  font-size: 15pt; /* 20px = 15pt */
+  font-size: 14.25pt; /* 19px = 14.25pt */
   outline: none;
   transition: border-color 0.2s ease;
-}
-
-.discount-input:focus {
-  border-color: #42b883;
+  min-width: 0; /* 确保flex项能正确收缩 */
 }
 
 .apply-btn {
-  padding: 12pt; /* 16px = 12pt, 30px = 22.5pt */
+  padding: 10.5pt 24pt; /* 14px = 10.5pt, 32px = 24pt */
   background-color: #42b883;
   color: white;
   border: none;
   border-radius: 8pt; /* 10px = 8pt */
-  font-size: 15pt; /* 20px = 15pt */
+  font-size: 14.25pt; /* 19px = 14.25pt */
   font-weight: 500;
   cursor: pointer;
   transition: background-color 0.2s ease;
+  white-space: nowrap; /* 防止按钮文字换行 */
 }
 
 .apply-btn:hover {
@@ -1124,4 +1173,44 @@ const selectCoupon = (couponId) => {
   background-color: #369c6a;
   box-shadow: 0 2.25pt 6pt rgba(66, 184, 131, 0.4); /* 3px = 2.25pt, 8px = 6pt */
 }
+
+/* Toast notification styles */
+.toast {
+  position: fixed;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  background-color: rgba(0, 0, 0, 0.8);
+  color: white;
+  padding: 12pt 24pt;
+  border-radius: 8pt;
+  font-size: 13pt;
+  font-weight: 500;
+  z-index: 1000;
+  box-shadow: 0 3pt 10pt rgba(0, 0, 0, 0.3);
+  animation: fadeInOut 2s ease;
+  text-align: left;
+  max-width: 80%;
+  white-space: pre-line;
+  line-height: 1.5;
+}
+
+@keyframes fadeInOut {
+  0% {
+    opacity: 0;
+    transform: translate(-50%, -50%) scale(0.9);
+  }
+  20% {
+    opacity: 1;
+    transform: translate(-50%, -50%) scale(1);
+  }
+  80% {
+    opacity: 1;
+    transform: translate(-50%, -50%) scale(1);
+  }
+  100% {
+    opacity: 0;
+    transform: translate(-50%, -50%) scale(0.9);
+  }
+}
 </style>