JS模块

       <script type="module">
		import {aaa, c, b} from ‘./js/index.js‘   // aaa as a 取别名
		console.log(aaas, b, c);
                
                // 也可以
                import * as obj from ‘./js/index.js‘
		console.log(obj.aaa);

	</script>

       // ./js/index.js

	var a = 10;
	var b = 20;
	var c = -30;

	export {
		a, // a as aa 取别名
		b,
		c
	}