server.js

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+const fetch = require('node-fetch');
+const express = require('express');
+const app = express();
+
+// 跨域配置（确保前端正常调用）
+app.use((req, res, next) => {
+  res.setHeader('Access-Control-Allow-Origin', '*');
+  res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS');
+  res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
+  if (req.method === 'OPTIONS') return res.sendStatus(200);
+  next();
+});
+
+// 支持大图片上传
+app.use(express.json({ limit: '10mb' }));
+app.use(express.urlencoded({ extended: true, limit: '10mb' }));
+
+// 你的有效密钥（不变）
+const BAIDU_API_KEY = "U3RlIPY6NeNvHkivaGQaT9RV"; 
+const BAIDU_SECRET_KEY = "fsOAjmvYyjD4Mtm1eRDhRd5VqP4aqZPC";
+const TONGYI_API_KEY = "sk-48bcbd07980c4c8db89129118fedd89f";
+
+// 1. 获取百度Token
+app.get('/baidu/token', async (req, res) => {
+  const tokenUrl = `https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id=${BAIDU_API_KEY}&client_secret=${BAIDU_SECRET_KEY}`;
+  try {
+    const response = await fetch(tokenUrl);
+    const data = await response.json();
+    res.json(data);
+  } catch (err) {
+    console.error('获取百度Token失败：', err);
+    res.status(500).json({ error: '获取Token失败' });
+  }
+});
+
+// 2. 植物识别接口
+app.post('/baidu/plant', async (req, res) => {
+  const { access_token, image } = req.body;
+  const pureBase64 = image.replace(/^data:image\/\w+;base64,/, '');
+  const plantUrl = `https://aip.baidubce.com/rest/2.0/image-classify/v1/plant?access_token=${access_token}`;
+  try {
+    const response = await fetch(plantUrl, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+      body: `image=${encodeURIComponent(pureBase64)}&top_num=1`
+    });
+    const data = await response.json();
+    res.json(data);
+  } catch (err) {
+    console.error('植物识别失败：', err);
+    res.status(500).json({ error: '识别出错' });
+  }
+});
+
+// 3. 养护建议接口（稳定版）
+app.post('/get-advice', async (req, res) => {
+  const { plantName } = req.body;
+  try {
+    const adviceResponse = await fetch("https://dashscope.aliyuncs.com/api/v1/services/aigc/text-generation/generation", {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+        "Authorization": `Bearer ${TONGYI_API_KEY}`
+      },
+      body: JSON.stringify({
+        model: "qwen-turbo",
+        input: {
+          prompt: `请给出${plantName}的3条养护建议，每条100字以内：1.光照温度；2.浇水施肥；3.常见问题。口语化。`
+        }
+      })
+    });
+    const adviceData = await adviceResponse.json();
+    res.json(adviceData);
+  } catch (error) {
+    console.error("生成建议失败：", error);
+    res.status(500).json({ error: "生成建议失败" });
+  }
+});
+
+// 启动服务（端口3000）
+app.listen(3000, () => {
+  console.log('后端启动：http://localhost:3000');
+});