es6---模块化

aliven12023-09-11 22:27

main.js

javascript 复制代码

import { bar } from "./module1";
import module2 from "./module2";
bar()
module2()

module1.js

javascript 复制代码

// 多变量导出，导入变量需要变量名一对一映射
export const module1='module1'
export function bar(params) {
    console.log(module1)
}

module2.js

javascript 复制代码

// 默认导出任何数据类型，导入变量名可随机取名
export default function bar(){
    console.log('bar module2');
}

package.json 和babel.config.json

javascript 复制代码

{
  "name": "es6",
  "version": "1.0.0",
  "description": "",
  "main": "main.js",
  "scripts": {
    "compile": "babel js --out-dir lib && browserify -e ./lib/main.js -o ./dist/boundle.js"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/cli": "^7.22.15",
    "@babel/core": "^7.22.15",
    "@babel/preset-env": "^7.22.15"
  }
}

{
    "presets": [
      [
        "@babel/preset-env",
        {
          "targets": {
            "edge": "17",
            "firefox": "60",
            "chrome": "67",
            "safari": "11.1"
          },
          "useBuiltIns": "usage",
          "corejs": "3.6.5"
        }
      ]
    ]
  }

index.html中使用编译之后的js

javascript 复制代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>es6</title>
</head>
<body>
    
</body>
<script src="./dist/boundle.js"></script>
</html>

note:

babel js --out-dir lib && browserify -e ./lib/main.js -o

./dist/boundle.js script中的compile命令，使用管道符&&串联命令。

先使用babel转换es6语法(名为env的preset)，再使用browserify编译代码