在 Node.js 中创建自定义模块
node.js 模块是一种包含某些函数或方法的包,可供导入它们的人使用。有些模块可以在网上供开发人员使用,例如 fs、fs-extra、crypto、stream 等。你还可以制作自己的包并将其用于你的代码中。
语法
exports.function_name = function(arg1, arg2, ....argN) { // Put your function body here... };
示例 - 自定义 Node 模块
创建两个名为 calc.js 和 index.js 的文件,并复制下面的代码片段。
calc.js 是将包含 node 函数的自定义 node 模块。
index.js 将导入 calc.js 并将其用于 node 进程中。
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));
输出
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
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