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别怕看不懂AI,跟我一步步写个调参界面,立马学会提示词

别怕看不懂AI,跟我一步步写个调参界面,立马学会提示词
很多人学 AI,一上来就去调各种框架,结果 Prompt 没写好,Agent 动不动就“胡说八道”。其实,Prompt Engineering 才是一切 AI 应用的起点。
但传统的 Prompt 教程是什么呢?一段 Python 代码,改完参数重新运行,看终端输出。做前端的人肯定受不了这个 —— 太不直观了。
今天,我就用前端最熟悉的 Next.js + LangChain.js,带你搭建一个 Prompt 实验室。你可以在网页上实时修改系统提示词、调整模型温度,然后马上看到 AI 的回复变化。整个过程你只需要懂 JS 和 React。
👉 你将学到:
  1. Prompt 的核心要素:系统消息、用户消息、温度参数。
  2. 如何用 LangChain.js 统一调用不同模型。
  3. 怎么做出一个能实时调参的 AI 调试界面。
我们要做什么?
最终效果:一个左侧是调参面板,右侧是聊天窗口的 Prompt 实验工具。你可以:
  • 切换 AI 的角色(如“毒舌评论员”、“暖心助手”)
  • 拖动滑块调整 temperature(控制创造性)
  • 立即看到同一个问题下的不同回复风格
这本质上是一个“前端化”的 Prompt 教学工具,也是你后续打造复杂 Agent 的原型。
第一步:理解 Prompt 的关键变量
给模型发消息时,一般包含两个角色:
System Message(系统提示词) 设定 AI 的全局人设、规则 像 CSS 全局样式,影响所有回复
User Message(用户提示词) 单次提问的具体内容 像组件 props,每次不同
另外还有一个重要参数:temperature(温度),范围 0~2。
  • 0:严谨、确定性强,适合事实问答
  • 1:平衡创造性与连贯性
  • 2:脑洞大开,容易跑偏
我们要做的界面,就是让你能动态调整系统提示词和温度,并观察效果。
第二步:后端实现——用 LangChain.js 写一个“受控”的模型
1. 初始化项目(注意: 1、langChain 要求 Node.js ≥ 20.x   
npx create-next-app@latest prompt-lab --typescript --tailwindcd prompt-labnpm install langchain @langchain/openai
2. 创建 API 路由,接收前端参数
创建 app/api/chat/route.ts:
import { NextRequest, NextResponse } from 'next/server';import { ChatOpenAI } from "@langchain/openai";import { HumanMessage, SystemMessage } from "@langchain/core/messages";export async function POST(req: NextRequest) { try {   const { systemPrompt, userMessage, temperature } = await req.json();   // 初始化模型,temperature 由前端控制   const model new ChatOpenAI({     modelName"gpt-3.5-turbo",     temperature: temperature ?? 0.7,     maxRetries1,     timeout30000,     configuration: {        baseURL: process.env.OPENAI_API_BASE || "https://api.openai.com/v1",      },    });   // 构建消息数组:系统提示词 + 用户消息   const messages = [     new SystemMessage(systemPrompt || "你是一个有帮助的助手。"),     new HumanMessage(userMessage || "你好"),   ];   const response = await model.invoke(messages);   return NextResponse.json({     successtrue,     reply: response.content,   }); } catch(error) {   return NextResponse.json({      successfalse     error"调用失败"    }, { status500 }); }}
3. 配置环境变量(当调用 model.invoke(messages) 时,LangChain 底层会:1. 检查环境变量 OPENAI_API_KEY 2. 使用该密钥向 OpenAI API 发起请求 3. 如果密钥不存在或无效,会抛出认证错误)
OPENAI_API_KEY=你的apiKeyOPENAI_API_BASE= api地址
(免费密钥获取,可关注公众号,点击下方免费密钥即可发送获取密钥方法)
核心逻辑就这几行。LangChain.js 帮你把不同模型(OpenAI、Claude 等)封装成统一接口,以后切换模型不用改前端代码。
第三步:前端实现——Prompt 实验室的交互灵魂
我们要做一个左右分栏的布局,左边调参,右边展示对话历史。
修改 app/page.tsx:
"use client";import { useState } from "react";export default function Home() { const [systemPrompt, setSystemPrompt] = useState("你是一个有帮助的助手。"); const [temperature, setTemperature] = useState(0.7); const [userInput, setUserInput] = useState(""); const [chatHistory, setChatHistory] = useState<{rolestringcontentstring}[]>([]); const [loading, setLoading] = useState(false);  const sendMessage = async () => {     if (!userInput.trim() || loading) return;     setLoading(true);     const newHistory = [...chatHistory,        { role"user"content: userInput }     ];     setChatHistory(newHistory);     setUserInput("");     try {       const res = await fetch("/api/chat", {         method"POST",         headers: { "Content-Type""application/json" },         bodyJSON.stringify({ systemPrompt, userMessage: userInput, temperature }),       });       const data = await res.json();       setChatHistory([...newHistory,          { role"assistant"content: data.reply }       ]);     } catch {       setChatHistory([...newHistory,          { role"assistant"content"请求失败" }       ]);   } finally {     setLoading(false);   } };  return ( <divclassName="flex h-screen max-w-6xl mx-auto p-4 gap-4"> {/* 左侧控制面板 */} <divclassName="w-80 bg-gray-50 p-4 rounded-lg space-y-4"> <h2className="font-bold text-lg">⚙️ Prompt 控制台</h2> <div> <labelclassName="block text-sm font-medium mb-1">系统提示词(人设)</label> <textarea className="w-full border rounded p-2 h-32 text-sm" value={systemPrompt} onChange={(e) => setSystemPrompt(e.target.value)} /> </div> <div> <labelclassName="block text-sm font-medium mb-1"> Temperature: {temperature} </label> <input type="range" min="0" max="2" step="0.1" value={temperature} onChange={(e) => setTemperature(parseFloat(e.target.value))} className="w-full" /> <divclassName="flex justify-between text-xs text-gray-400"> <span>严谨 (0)</span> <span>平衡 (1)</span> <span>狂放 (2)</span> </div> </div> {/* 预设模板 */} <div> <labelclassName="block text-sm font-medium mb-2">快速预设</label> <divclassName="space-y-1"> {[ { label: "毒舌评论员", prompt: "你是一个尖酸刻薄的评论员,喜欢吐槽一切。" }, { label: "暖心朋友", prompt: "你是一个温暖、鼓励人的好朋友,总是看到光明面。" }, { label: "代码导师", prompt: "你是一个资深前端工程师,回答简洁,直接给代码方案。" }, ].map((preset) => ( <button key={preset.label} onClick={() => setSystemPrompt(preset.prompt)} className="block w-full text-left px-3 py-2 bg-white border rounded text-sm hover:bg-blue-50" > {preset.label} </button> ))} </div> </div> </div> {/* 右侧聊天区域 */} <divclassName="flex-1 flex flex-col border rounded-lg"> <divclassName="flex-1 overflow-y-auto p-4 space-y-3"> {chatHistory.map((msg, i) => ( <divkey={i}className={`flex ${msg.role === "user" ? "justify-end: "justify-start"}`}> <divclassName={`p-3rounded-lgmax-w-[70%] ${ msg.role === "user" ? "bg-blue-500 text-white: "bg-gray-100" }`}> {msg.content} </div> </div> ))} {loading && <divclassName="text-gray-400 text-sm">AI 正在思考...</div>} </div> <divclassName="border-t p-4 flex gap-2"> <input className="flex-1 border rounded-lg p-3" value={userInput} onChange={(e) => setUserInput(e.target.value)} onKeyDown={(e) => e.key === "Enter" && sendMessage()} placeholder="试试问同一个问题,然后切换左侧人设..." /> <button className="bg-blue-500 text-white px-6 rounded-lg disabled:opacity-50" onClick={sendMessage} disabled={loading} > 发送 </button> </div> </div> </div> );}
第四步:玩起来,边调边学
现在运行 npm run dev,在浏览器打开 http://localhost:3000。
实验 1:验证 Temperature 效果
先用温度 0 问:“解释一下 JavaScript 闭包”。
再调到 2 问同样的问题。你会发现第二次回答可能突然跑题到“我奶奶的毛衣”,这就是 Temperature 太高带来的随机性。
实验 2:验证系统提示词
问:“今天心情不好”。
分别用“暖心朋友”和“毒舌评论员”的人设测试,观察回复风格的巨大差异。
这就是 Prompt Engineering 的直观教学——不需要看终端,一切都在界面里实时反馈。
总结
这一篇我们完成了:
  • 用 LangChain.js 封装了模型调用
  • 用前端界面把 Prompt 调试变得可视化、可交互
  • 亲手验证了系统提示词和温度的核心作用
基础打好了,下一步就是让 AI 能够“做事”。我会带你实现 Function Calling——让模型调用你定义的工具函数(查天气、算数学、搜资料),并且把这些调用过程在前端实时展示出来。那才是真正 Agent 的开始。
如果这篇教程帮到了你,欢迎点赞、收藏,并且关注我的专栏《前端转 Agent 全栈工程师实战》,我们一起用代码为 AI 装上漂亮、好用的界面。
基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-06-01 22:32:11 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/696168.html
  2. 运行时间 : 0.119552s [ 吞吐率:8.36req/s ] 内存消耗:4,622.45kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=2ca187ea698ef24019ca82524c960cc6
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  1. CONNECT:[ UseTime:0.000607s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000828s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000354s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000298s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000548s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000533s ]
  8. SELECT * FROM `article` WHERE `id` = 696168 LIMIT 1 [ RunTime:0.000438s ]
  9. UPDATE `article` SET `lasttime` = 1780324331 WHERE `id` = 696168 [ RunTime:0.006358s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000254s ]
  11. SELECT * FROM `article` WHERE `id` < 696168 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000443s ]
  12. SELECT * FROM `article` WHERE `id` > 696168 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002050s ]
  13. SELECT * FROM `article` WHERE `id` < 696168 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000654s ]
  14. SELECT * FROM `article` WHERE `id` < 696168 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000760s ]
  15. SELECT * FROM `article` WHERE `id` < 696168 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000632s ]
0.125999s