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                ThinkChat2.0新版上線,更智能更精彩,支持會話、畫圖、視頻、閱讀、搜索等,送10W Token,即刻開啟你的AI之旅 廣告
                [TOC] [背景]("https://www.cnblogs.com/Leo_wl/p/4869090.html") [模塊化參考網站]("https://www.jianshu.com/p/3d69d4ac2dfe") ### 模塊化特點 ~~~ 1. 每一個模塊只加載一次, 每一個JS只執行一次, 如果下次再去加載同目錄下同文件,直接從內存中讀取; 2. 每一個模塊內聲明的變量都是局部變量, 不會污染全局作用域; 3. 模塊內部的變量或者函數可以通過export導出; 4. 一個模塊可以導入別的模塊 ~~~ ### 命令: ~~~ 模塊功能主要由兩個命令構成:export和import。export命令用于規定模塊的對外接口,import命令用于輸入其他模塊提供的功能; ~~~ ### 使用方法: 方法1 ~~~ 在js文件中: export var firstName = 'Michael'; export var lastName = 'Jackson'; export var year = 1958; 另一個js文件中: import {firstName, lastName, year} from './profile'; ~~~ 方法2:(參看微信小程序) 封裝 ~~~ var imgUrl=[ {src:"/images/banner01.png"}, {src:"/images/banner02.png"}, {src:"/images/banner03.png"}, {src:"/images/banner04.png"} ]; module.exports={ imgUrl:imgUrl }; ~~~ 使用 ~~~ var local = require("../data/local.js"); ~~~
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