node.js - require 中的 Node js : Why module. Exports = tesdf() 仅在 get 请求中执行一次

Question

index.js

'use strict'

const express = require('express')
const app = express()

app.get('/', (req, res, next) => {
       require('./test.js') // after repeated request is not executed
       console.log("test")//after repeated request is  executed
       next();
    })

app.listen(8097)

测试.js

function tesdf(){console.log("Gtest test", ind++); }
module.exports = tesdf()

如何使函数再次被调用。谢谢。

Answer 1

导出文件时，您会导出函数、类或变量。此处您将导出 tesdf() 函数的结果。要解决这个问题，只需将其导出即可:

function tesdf(){console.log("Gtest test", ind++); }

module.exports = tesdf

此外，您不应该在 get 请求中使用 required('./test.js') 因为每次某个客户端请求该端点时，该方法都会加载该文件。例如

let test = require('./test.js');
app.get('/', (req, res, next) => {
       test();//Call the method
       console.log("test")//after repeated request is  executed
       next();
    })