javascript - 如何在nodejs中提供文件之前保存变量

Question

给出以下代码:

 const https = require('https');
 const fs = require('fs');
 var path = require('path');
 const express = require('express');
 const app = express();
 const router = express.Router();
 const pool = require('./mysqldb.js');
 const pathView = __dirname + "/views/";
 const IMGPath = "/public";
 var bodyParser = require("body-parser");
 const listenPort = 8010;
 var id = null ;

 router.get('/details/:id', async function (req, res, next) {
 id = req.params.id;
 if ( typeof req.params.id === "number"){id = parseInt(id);}
 res.render('details.ejs' );
 });

主要目标是在提供details.ejs文件之前将req.params.id(来自url的id)保存在id变量中。我尝试删除异步但没有成功。你能帮我吗？

Answer 1

您可以在 async 函数中使用 await 关键字，如下所示:

router.get('/details/:id', async function (req, res, next) {
    await (() => { id = req.params.id; })(); // Will run first
    await (() => { res.send(id); })(); // Will run second
})

res.send(id) 或 res.render('details.ejs') (在您的情况下)将在检索 id 后运行