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miniprogram/pages/qa/index.js

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+const { request } = require('../../utils/request')
+
+Page({
+  data: {
+    question: '',
+    answer: '',
+    provider: 'fastgpt',
+    mode: 'auto',
+    hits: [],
+    adviceType: 'general',
+    loading: false,
+    providerOptions: ['fastgpt', 'dify', 'local'],
+    modeOptions: ['auto', 'local', 'llm'],
+    adviceOptions: ['general', 'gain_muscle', 'lose_fat', 'keto', 'nutritionist']
+  },
+
+  onInput(e) {
+    const field = e.currentTarget.dataset.field
+    this.setData({ [field]: e.detail.value })
+  },
+
+  onPickerChange(e) {
+    const field = e.currentTarget.dataset.field
+    const options = this.data[`${field}Options`]
+    this.setData({ [field]: options[e.detail.value] })
+  },
+
+  async askQuestion() {
+    if (!this.data.question.trim()) {
+      wx.showToast({ title: '请输入问题', icon: 'none' })
+      return
+    }
+    this.setData({ loading: true })
+
+    try {
+      const provider = this.data.provider === 'local' ? 'fastgpt' : this.data.provider
+      const mode = this.data.provider === 'local' ? 'local' : this.data.mode
+      const data = await request({
+        url: '/qa/ask',
+        method: 'POST',
+        data: {
+          question: this.data.question,
+          provider,
+          mode
+        }
+      })
+      this.setData({ answer: data.answer, hits: data.items || [] })
+    } catch (err) {
+      // handled
+    } finally {
+      this.setData({ loading: false })
+    }
+  },
+
+  async getAdvice() {
+    this.setData({ loading: true })
+    try {
+      const provider = this.data.provider === 'local' ? 'dify' : this.data.provider
+      const data = await request({
+        url: '/qa/advice',
+        method: 'POST',
+        data: {
+          advice_type: this.data.adviceType,
+          question: this.data.question || '请给我本周饮食建议',
+          provider
+        }
+      })
+      this.setData({ answer: data.answer, hits: data.knowledge_hits || [] })
+    } catch (err) {
+      // handled
+    } finally {
+      this.setData({ loading: false })
+    }
+  }
+})

miniprogram/pages/qa/index.json

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+{
+  "navigationBarTitleText": "营养问答"
+}

miniprogram/pages/qa/index.wxml

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+<view class="container">
+  <view class="hero">
+    <view class="hero-title">营养学科普问答</view>
+    <view class="hero-sub">RAG 本地知识库 + FastGPT / Dify 工作流</view>
+  </view>
+
+  <view class="card">
+    <view class="card-title">问答配置</view>
+    <textarea class="input textarea" data-field="question" placeholder="输入问题，如：减脂期晚餐怎么吃？" value="{{question}}" bindinput="onInput" />
+
+    <view class="row">
+      <text class="label">模型来源</text>
+      <picker mode="selector" range="{{providerOptions}}" data-field="provider" bindchange="onPickerChange">
+        <text class="value">{{provider}}</text>
+      </picker>
+    </view>
+
+    <view class="row">
+      <text class="label">问答模式</text>
+      <picker mode="selector" range="{{modeOptions}}" data-field="mode" bindchange="onPickerChange">
+        <text class="value">{{mode}}</text>
+      </picker>
+    </view>
+
+    <view class="row">
+      <text class="label">功能化建议</text>
+      <picker mode="selector" range="{{adviceOptions}}" data-field="adviceType" bindchange="onPickerChange">
+        <text class="value">{{adviceType}}</text>
+      </picker>
+    </view>
+
+    <button class="btn btn-primary" loading="{{loading}}" bindtap="askQuestion">提问（科普问答）</button>
+    <button class="btn btn-accent" loading="{{loading}}" bindtap="getAdvice">生成个性化建议</button>
+  </view>
+
+  <view class="card" wx:if="{{answer}}">
+    <view class="card-title">回答结果</view>
+    <view class="item-sub">{{answer}}</view>
+  </view>
+
+  <view class="card" wx:if="{{hits && hits.length}}">
+    <view class="card-title">RAG 命中文档</view>
+    <view class="item" wx:for="{{hits}}" wx:key="index">
+      <view class="item-title">{{item.question}}</view>
+      <view class="item-sub">{{item.answer}}</view>
+      <view class="item-sub">score: {{item.score}} | source: {{item.source}}</view>
+    </view>
+  </view>
+</view>

miniprogram/pages/qa/index.wxss

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+.card .row {
+  margin-top: 8rpx;
+}