feat: 卖出数量限制，不能超过当前持仓数量

pages/detail/detail.vue

@@ -185,12 +185,12 @@
           </view>
           
           <view class="form-item">
-            <text class="form-label">数量</text>
+            <text class="form-label">数量{{ transactionType === 'sell' && maxSellAmount > 0 ? `(最多可卖 ${maxSellAmount} 份)` : '' }}</text>
             <input 
               v-model="transactionForm.amount" 
               class="form-input" 
               type="number" 
-              placeholder="请输入数量"
+              :placeholder="transactionType === 'sell' && maxSellAmount > 0 ? `请输入数量，不超过 ${maxSellAmount}` : '请输入数量'"
             />
           </view>
           
@@ -292,6 +292,8 @@ const transactionForm = ref({
   transactionDate: getCurrentDate(),
   remark: ''
 });
+// 当前选中持仓的最大可卖数量
+const maxSellAmount = ref(0);
 
 // 货币选择相关
 const currencyList = ref([
@@ -349,6 +351,13 @@ const selectStock = (result) => {
       transactionForm.value.currency = currency;
     }
   }
+  // 如果是卖出，获取该持仓的最大可卖数量
+  if (transactionType.value === 'sell') {
+    const position = positions.value.find(pos => pos.stockCode === transactionForm.value.stockCode);
+    maxSellAmount.value = position ? position.amount : 0;
+  } else {
+    maxSellAmount.value = 0;
+  }
   searchResults.value = [];
 };
 
@@ -418,9 +427,10 @@ const handleSell = () => {
   // 卖出时自动填充持仓列表作为可选
   searchResults.value = positions.value.map(pos => ({
     ticker: pos.stockCode,
-    name: pos.stockName,
+    stockName: pos.stockName,
     assetType: pos.assetType || 'Stock',
-    priceCurrency: pos.currency,
+    currency: pos.currency,
+    amount: pos.amount,
     exchange: ''
   }));
   showTransactionForm.value = true;
@@ -437,16 +447,23 @@ const resetTransactionForm = () => {
   };
   // 重置搜索结果
   searchResults.value = [];
+  // 重置最大可卖数量
+  maxSellAmount.value = 0;
 };
 
 const submitTransaction = async () => {
   // 表单验证
   if (!transactionForm.value.stockCode) {
-    return uni.showToast({ title: '请输入股票代码', icon: 'none' });
+    return uni.showToast({ title: transactionType.value === 'sell' ? '请选择要卖出的持仓' : '请输入股票代码', icon: 'none' });
   }
-  if (!transactionForm.value.amount || parseFloat(transactionForm.value.amount) <= 0) {
+  const amount = parseFloat(transactionForm.value.amount);
+  if (!amount || amount <= 0) {
     return uni.showToast({ title: '请输入有效的数量', icon: 'none' });
   }
+  // 卖出时校验数量不超过持仓
+  if (transactionType.value === 'sell' && amount > maxSellAmount.value) {
+    return uni.showToast({ title: `卖出数量不能超过持仓数量 ${maxSellAmount.value}`, icon: 'none' });
+  }
   if (!transactionForm.value.price || parseFloat(transactionForm.value.price) <= 0) {
     return uni.showToast({ title: '请输入有效的价格', icon: 'none' });
   }