node.js - 页面传给nodejs一个data信息，nodejs连接数据库后把结果返回给页面，不用nodejs其他框架整个流程怎么写？

Question

在页面点击一个按钮，发起get请求，js文件怎么监听到有这个请求然后根据参数查询数据库，和怎么返回给页面。我要整个完整能运行的代码，即连服务器也开启了。因为是新手，所以网上片段式的解答暂时还不能解答我的疑惑。
小女子谢谢各位老大了，我的数据库课设靠你们了

Answer 1

It is recommended to use frameworks such as express, because it is quite troublesome to do routing matching yourself. If you go through the express documentation first, I believe you will have a general idea.

Answer 2

The function of the framework is mostly to provide a simple routing interface and to remove cumbersome request preprocessing operations.

const http=require('http');
//<TODO>数据库连接
http.createServer((req,res)=>{
    //处理url
    const path = req.url.replace(/\/?(?:\?.*)?$/,'').toLowerCase();
    switch(path){
        case '': todo(req,'/index.html');
        case '/about': todo(req,'/about.html');
        default : todo(req,'/404')
    };
});
function todo(res,path){
    //<TODO>数据库操作
};

Using express is quite simple, just write the route and corresponding handler:

const app = require('express')();
app.listen(3000,(err)=>{
    err && console.log(err);
});
app.get('/',handler.home);
app.get('/about',handler.about);
app.use((req,res)=>{
    res.status(404);
    res.send('404');
})

Answer 3

You can teach, but I don’t teach transvestites, haha.

Go to the Express official website and read the documentation. First understand the routing, and then ask how to connect to the database.

Answer 4

I just used native nodejs to write a blog backend