目录
Ollama JavaScript / Node.js 教程:掌握对话、流式输出与 API 调用
安装
npm install ollama
基本对话
import ollama from "ollama";
const response = await ollama.chat({
model: "qwen3:8b",
messages: [
{ role: "system", content: "请用简体中文回答。" },
{ role: "user", content: "JavaScript 和 TypeScript 有什么不同?" },
],
});
console.log(response.message.content);
(使用 ES modules:文件名使用 .mjs,或在 package.json 中设置 "type": "module"。)
流式输出
import ollama from "ollama";
const stream = await ollama.chat({
model: "qwen3:8b",
messages: [{ role: "user", content: "写一首四行短诗" }],
stream: true,
});
for await (const part of stream) {
process.stdout.write(part.message.content);
}
中止生成
用户按下“停止”时:
const stream = await ollama.chat({ model: "qwen3:8b", messages, stream: true });
setTimeout(() => stream.abort(), 3000); // 3 秒后中止
try {
for await (const part of stream) process.stdout.write(part.message.content);
} catch (err) {
if (err.name === "AbortError") console.log("\n已停止");
}
连接到其他主机
import { Ollama } from "ollama";
const client = new Ollama({ host: "http://192.168.1.50:11434" });
const res = await client.chat({ model: "qwen3:8b", messages: [{ role: "user", content: "你好" }] });
在浏览器中使用
import ollama from "ollama/browser";
从网页直接调用本机的 Ollama 时,需要设置 OLLAMA_ORIGINS,允许网页来源访问,参见环境变量与设置。在正式产品中,通常由自己的后端转发请求,不让浏览器直接连接 Ollama。
不安装包:直接使用 fetch
const res = await fetch("http://localhost:11434/api/chat", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({
model: "qwen3:8b",
messages: [{ role: "user", content: "你好" }],
stream: false,
}),
});
const data = await res.json();
console.log(data.message.content);
使用 fetch 处理流式输出
流式响应每行包含一个 JSON(NDJSON):
const res = await fetch("http://localhost:11434/api/chat", {
method: "POST",
body: JSON.stringify({ model: "qwen3:8b", messages: [{ role: "user", content: "从 1 数到 10" }] }),
});
const reader = res.body.getReader();
const decoder = new TextDecoder();
let buffer = "";
while (true) {
const { value, done } = await reader.read();
if (done) break;
buffer += decoder.decode(value, { stream: true });
const lines = buffer.split("\n");
buffer = lines.pop(); // 最后一行可能不完整,留到下次
for (const line of lines) {
if (!line.trim()) continue;
const chunk = JSON.parse(line);
process.stdout.write(chunk.message?.content ?? "");
}
}
使用 OpenAI SDK
npm install openai
import OpenAI from "openai";
const openai = new OpenAI({ baseURL: "http://localhost:11434/v1", apiKey: "ollama" });
const completion = await openai.chat.completions.create({
model: "qwen3:8b",
messages: [{ role: "user", content: "你好" }],
});
console.log(completion.choices[0].message.content);
简单的 Express API
将 Ollama 封装成自己的 API,供前端调用:
import express from "express";
import ollama from "ollama";
const app = express();
app.use(express.json());
app.post("/api/ask", async (req, res) => {
const { question } = req.body;
res.setHeader("Content-Type", "text/plain; charset=utf-8");
const stream = await ollama.chat({
model: "qwen3:8b",
messages: [
{ role: "system", content: "请用简体中文简洁回答。" },
{ role: "user", content: question },
],
stream: true,
});
for await (const part of stream) res.write(part.message.content);
res.end();
});
app.listen(3000, () => console.log("http://localhost:3000"));
curl -N -X POST http://localhost:3000/api/ask \
-H "Content-Type: application/json" \
-d '{"question":"什么是 API?"}' 更新于 2026年10月12日