AI 生成: 基于 Flask 的 AI 免费对话应用，后端集成豆包（Doubao）和 DeepSeek，通过 SSE 实时推送消息，前端提供简洁的聊天界面。

2026-09-29 18:16:35 +08:00
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+// AI 免费对话 - 前端逻辑
+(function () {
+  const chatEl = document.getElementById("chat");
+  const inputEl = document.getElementById("input");
+  const sendBtn = document.getElementById("send");
+
+  // 保存对话历史（用于多轮上下文）
+  const history = [];
+  let sending = false;
+
+  /** 获取当前选择的 provider */
+  function getProvider() {
+    const el = document.querySelector('input[name="provider"]:checked');
+    return el ? el.value : "deepseek";
+  }
+
+  /** 追加一条消息到界面 */
+  function appendMessage(role, content) {
+    const wrapper = document.createElement("div");
+    wrapper.className = `message ${role}`;
+    const bubble = document.createElement("div");
+    bubble.className = "bubble";
+    bubble.textContent = content;
+    wrapper.appendChild(bubble);
+    chatEl.appendChild(wrapper);
+    chatEl.scrollTop = chatEl.scrollHeight;
+    return bubble;
+  }
+
+  /** 发送消息并接收 SSE 流 */
+  async function send() {
+    if (sending) return;
+    const text = inputEl.value.trim();
+    if (!text) return;
+
+    sending = true;
+    sendBtn.disabled = true;
+    inputEl.value = "";
+
+    // 展示用户消息
+    appendMessage("user", text);
+    history.push({ role: "user", content: text });
+
+    // 展示助手占位
+    const bubble = appendMessage("assistant", "");
+    bubble.classList.add("cursor");
+
+    let assistantText = "";
+
+    try {
+      const resp = await fetch("api/chat", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({
+          provider: getProvider(),
+          messages: history,
+        }),
+      });
+
+      if (!resp.ok || !resp.body) {
+        throw new Error("网络请求失败");
+      }
+
+      const reader = resp.body.getReader();
+      const decoder = new TextDecoder("utf-8");
+      let buffer = "";
+
+      while (true) {
+        const { done, value } = await reader.read();
+        if (done) break;
+        buffer += decoder.decode(value, { stream: true });
+
+        // 按 SSE 事件分隔（\n\n）
+        const parts = buffer.split("\n\n");
+        buffer = parts.pop(); // 保留最后不完整片段
+
+        for (const part of parts) {
+          const line = part.trim();
+          if (!line.startsWith("data:")) continue;
+          const data = line.slice(5).trim();
+          if (data === "[DONE]") continue;
+          try {
+            const obj = JSON.parse(data);
+            if (obj.error) {
+              assistantText += `\n[错误] ${obj.error}`;
+              bubble.textContent = assistantText;
+            } else if (obj.content) {
+              assistantText += obj.content;
+              bubble.textContent = assistantText;
+              chatEl.scrollTop = chatEl.scrollHeight;
+            }
+          } catch (e) {
+            // 忽略解析错误
+          }
+        }
+      }
+    } catch (err) {
+      assistantText += `\n[错误] ${err.message}`;
+      bubble.textContent = assistantText;
+    } finally {
+      bubble.classList.remove("cursor");
+      if (assistantText) {
+        history.push({ role: "assistant", content: assistantText });
+      }
+      sending = false;
+      sendBtn.disabled = false;
+      inputEl.focus();
+    }
+  }
+
+  // 事件绑定
+  sendBtn.addEventListener("click", send);
+  inputEl.addEventListener("keydown", function (e) {
+    if (e.key === "Enter" && !e.shiftKey) {
+      e.preventDefault();
+      send();
+    }
+  });
+})();