模块和require()
我有两个文件,一个between1.js,第二个是import.js。在between1.js我得到了一些功能和我搬到import.js的功能之一。我得到的锻炼是使用模块和需要的功能。这个问题我还是如何使用要求between1.js。请参见下面的代码
Between1.js代码:
import.js:
我对js和节点初学者。我在import.js了功能和代码的底部是否意味着出口模块,并在第二个文件between1.js,我试图通过率先导入功能module.exports:让utils的要求=(” ./ import.js “);而在底部试图让功能,但问题是,我真的不知道怎么样。我试图像我在代码前贴上但dosesn't工作
我想是有人帮我解释如何要求和模块的工作。
import.js代码:
/**
* Module.
*
* Matteus Urbaniak
*/
"use strict";
function teacherAsTable(res) {
let str;
str = "+-----------+---------------------+-----------+----------+--------------+\n";
str += "| Akronym | Namn | Avdelning | Lön | Kompetens |\n";
str += "|-----------|---------------------|-----------|----------|--------------|\n";
for (const row of res) {
str += "| ";
str += row.akronym.padEnd(10);
str += "| ";
str += (row.fornamn + " " + row.efternamn).padEnd(20);
str += "| ";
str += row.avdelning.padEnd(10);
str += "| ";
str += row.lon.toString().padStart(9);
str += "| ";
str += row.kompetens.toString().padEnd(12);
str += " |\n";
}
str += "+-----------+---------------------+-----------+----------+--------------|\n";
return str;
}
module.exports = {
"teacherAsTable": teacherAsTable
};
between1.js
/**
Arbete gjordes av Matteus Urbaniak
*/
"use strict";
/**
Jag använder programmeringsstilen med async/await
för att hantera asynkrona anrop. För det syftet väljer
jag paketet promise-mysql som är en wrapper kring paketet mysql.
*/
const mysql = require("promise-mysql");
// Inloggningsdetaljer till databasen.
const config = require("./config.json");
let utils = require("./import.js");
// Läsa från komand linje
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
/**
Main function
*/
(async function() {
const db = await mysql.createConnection(config);
let str;
rl.question("What do you want search for? (min); ", async (min) => {
rl.question("What do you want search for? (max); ", async (max) => {
str = await searchBetween(db, min, max);
console.info(str);
rl.close();
db.end();
});
});
})();
// Ge en rapport med larare details och formaterad text.
async function searchBetween(db, min, max) {
let sql;
let res;
let str;
let minimum = `${min}`;
let maximum = `${max}`;
console.info(`Searching for: ${minimum} - ${maximum}`);
sql = `
SELECT
akronym,
fornamn,
efternamn,
avdelning,
lon,
kompetens
FROM larare
WHERE
(kompetens BETWEEN ? AND ?)
OR
lon BETWEEN ? AND ?
ORDER BY akronym;
`;
res = await db.query(sql, [minimum, maximum, minimum, maximum]);
str = teacherAsTable(res);
return str;
}
// HERE SHOULD BE teacherAsTable
let res;
res = utils.teacherAsTable();
console.log(res);
回答如下:
尝试在Between1.js这样做:
module.exports = {teacherAsTable};