node.js 模塊是一種包,其中包含某些供導(dǎo)入它們的人使用的函數(shù)或方法。網(wǎng)絡(luò)上提供了一些模塊供開(kāi)發(fā)人員使用,例如 fs、fs-extra、crypto、stream 等。您也可以制作自己的包并在代碼中使用它。
語(yǔ)法
exports.function_name = function(arg1, arg2, ....argN) { // Put your function body here... };
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示例 – 自定義節(jié)點(diǎn)模塊
創(chuàng)建兩個(gè)名為 calc.js 和 index.js 的文件,并復(fù)制以下代碼片段。
calc.js 是自定義節(jié)點(diǎn)將保存節(jié)點(diǎn)功能的模塊。
index.js 將導(dǎo)入 calc.js 并在節(jié)點(diǎn)進(jìn)程中使用它。
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 };
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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));
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輸出
C:\homeode>> 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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