docs: 更新README文档中的API使用示例和错误处理说明

@@ -140,11 +140,238 @@ export const updateProfileAPI = (params) => fn(fetch.post(Api.UPDATE_PROFILE, pa
 
 #### 3. 错误处理机制
 
-`fn()` 函数自动处理API响应：
-- 成功时返回 `response.data`
-- 失败时显示错误提示并返回 `false`
+`fn()` 函数处理API响应并返回标准格式：
+- 返回格式：`{ code, msg, data }`
+- `code === 1` 表示请求成功，其他值表示失败
+- `msg` 包含服务器返回的提示信息
+- `data` 包含具体的业务数据
 - 特殊处理"计全付"相关错误，使用模态框显示
 
+#### 4. API使用示例
+
+##### 在组件中调用API
+
+```javascript
+<script setup>
+import { ref, onMounted } from 'vue';
+import { getProfileAPI, updateProfileAPI } from '@/api/index';
+import { getVehicleListAPI, addVehicleAPI } from '@/api/car';
+import { getOrderListAPI } from '@/api/orders';
+
+// 响应式数据
+const userInfo = ref({});
+const vehicleList = ref([]);
+const orderList = ref([]);
+const loading = ref(false);
+
+// 获取用户信息
+const fetchUserProfile = async () => {
+    loading.value = true;
+    try {
+        const { code, msg, data } = await getProfileAPI();
+        if (code === 1) {
+            userInfo.value = data;
+            console.log('用户信息获取成功:', data);
+        } else {
+            console.error('获取用户信息失败:', msg);
+        }
+    } catch (error) {
+        console.error('获取用户信息异常:', error);
+    } finally {
+        loading.value = false;
+    }
+};
+
+// 更新用户资料
+const updateProfile = async (profileData) => {
+    const params = {
+        nickname: profileData.nickname,
+        avatar_url: profileData.avatar_url,
+        gender: profileData.gender
+    };
+    
+    const { code, msg, data } = await updateProfileAPI(params);
+    if (code === 1) {
+        console.log('资料更新成功:', msg);
+        // 重新获取用户信息
+        await fetchUserProfile();
+    }
+};
+
+// 获取车辆列表
+const fetchVehicleList = async () => {
+    const params = {
+        page: 1,
+        limit: 10,
+        status: 1 // 1-在售 2-已售
+    };
+    
+    const { code, msg, data } = await getVehicleListAPI(params);
+    if (code === 1) {
+        vehicleList.value = data.list;
+        console.log('车辆列表:', data);
+    }
+};
+
+// 添加车辆
+const addVehicle = async (vehicleData) => {
+    const params = {
+        brand_id: vehicleData.brand_id,
+        model_id: vehicleData.model_id,
+        price: vehicleData.price,
+        description: vehicleData.description,
+        images: vehicleData.images, // 图片数组
+        contact_phone: vehicleData.contact_phone
+    };
+    
+    const { code, msg, data } = await addVehicleAPI(params);
+    if (code === 1) {
+        console.log('车辆添加成功:', msg);
+        // 刷新车辆列表
+        await fetchVehicleList();
+    }
+};
+
+// 获取订单列表
+const fetchOrderList = async (status = '') => {
+    const params = {
+        page: 1,
+        limit: 20
+    };
+    
+    if (status) {
+        params.status = status; // 订单状态筛选
+    }
+    
+    const { code, msg, data } = await getOrderListAPI(params);
+    if (code === 1) {
+        orderList.value = data.list;
+        console.log('订单列表:', data);
+    }
+};
+
+// 页面加载时获取数据
+onMounted(() => {
+    fetchUserProfile();
+    fetchVehicleList();
+    fetchOrderList();
+});
+</script>
+```
+
+##### 带错误处理的API调用
+
+```javascript
+// 完整的错误处理示例
+const handleApiCall = async (apiFunction, params, successMessage = '') => {
+    loading.value = true;
+    
+    try {
+        const { code, msg, data } = await apiFunction(params);
+        
+        if (code === 1) {
+            // API调用成功
+            if (successMessage) {
+                // 显示成功提示
+                Taro.showToast({
+                    title: successMessage,
+                    icon: 'success'
+                });
+            }
+            return { code, msg, data };
+        } else {
+            // API返回失败，显示服务器返回的错误信息
+            Taro.showToast({
+                title: msg || '操作失败',
+                icon: 'none'
+            });
+            return false;
+        }
+    } catch (error) {
+        // 网络错误或其他异常
+        console.error('API调用异常:', error);
+        Taro.showToast({
+            title: '网络异常，请稍后重试',
+            icon: 'none'
+        });
+        return false;
+    } finally {
+        loading.value = false;
+    }
+};
+
+// 使用示例
+const saveProfile = async () => {
+    const result = await handleApiCall(
+        updateProfileAPI,
+        { nickname: '新昵称' },
+        '资料保存成功'
+    );
+    
+    if (result) {
+        // 处理成功后的逻辑
+        await fetchUserProfile();
+    }
+};
+```
+
+##### 分页数据加载示例
+
+```javascript
+// 分页加载车辆列表
+const vehicleListData = ref({
+    list: [],
+    page: 1,
+    limit: 10,
+    total: 0,
+    hasMore: true
+});
+
+// 加载车辆列表（支持分页和下拉刷新）
+const loadVehicleList = async (refresh = false) => {
+    if (refresh) {
+        vehicleListData.value.page = 1;
+        vehicleListData.value.list = [];
+        vehicleListData.value.hasMore = true;
+    }
+    
+    if (!vehicleListData.value.hasMore) return;
+    
+    const params = {
+        page: vehicleListData.value.page,
+        limit: vehicleListData.value.limit,
+        status: 1
+    };
+    
+    const { code, msg, data } = await getVehicleListAPI(params);
+    if (code === 1) {
+        const { list, total } = data;
+        
+        if (refresh) {
+            vehicleListData.value.list = list;
+        } else {
+            vehicleListData.value.list.push(...list);
+        }
+        
+        vehicleListData.value.total = total;
+        vehicleListData.value.page++;
+        
+        // 判断是否还有更多数据
+        vehicleListData.value.hasMore = vehicleListData.value.list.length < total;
+    }
+};
+
+// 下拉刷新
+const onRefresh = () => {
+    loadVehicleList(true);
+};
+
+// 上拉加载更多
+const onLoadMore = () => {
+    loadVehicleList(false);
+};
+```
+
 ### 网络请求配置
 
 #### 1. 环境配置