在 Node.js 中建立自定義模組


node.js 模組是一種包含某些函式或方法的包,可供匯入它們的人使用。有些模組可以在網上供開發人員使用,例如 fs、fs-extra、crypto、stream 等。你還可以製作自己的包並將其用於你的程式碼中。

語法

exports.function_name = function(arg1, arg2, ....argN) {
   // Put your function body here...
};

示例 - 自定義 Node 模組

建立兩個名為 calc.js 和 index.js 的檔案,並複製下面的程式碼片段。

calc.js 是將包含 node 函式的自定義 node 模組。

index.js 將匯入 calc.js 並將其用於 node 程序中。

calc.js

//Creating a custom node module
// And making different functions
exports.add = function (a, b) {
   return a + b; // Adding the numbers
};

exports.sub = function (a, b) {
   return a - b; // Subtracting the numbers
};

exports.mul = function (a, b) {
   return a * b; // Multiplying the numbers
};

exports.div = function (a, b) {
   return a / b; // Dividing the numbers
};

index.js

// Importing the custom node module with the below statement
var calculator = require('./calc');

var a = 21 , b = 67

console.log("Addition of " + a + " and " + b + " is " + calculator.add(a, b));

console.log("Subtraction of " + a + " and " + b + " is " + calculator.sub(a, b));

console.log("Multiplication of " + a + " and " + b + " is " + calculator.mul(a, b));

console.log("Division of " + a + " and " + b + " is " + calculator.div(a, b));

輸出

C:\home
ode>> node index.js Addition of 21 and 67 is 88 Subtraction of 21 and 67 is -46 Multiplication of 21 and 67 is 1407 Division of 21 and 67 is 0.31343283582089554

更新於: 20-May-2021

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