补充 for

skills/javascript/README.md

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+# js
+
+[课件](https://gitee.com/infraboard/go-course/blob/master/day19/javascript.md)
+
+安装Code Runner插件

skills/javascript/app.mjs

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+// 唯一的全局变量MYAPP:
+var MYAPP = {};
+
+// 其他变量:
+MYAPP.name = 'myapp';
+MYAPP.version = 1.0;
+
+// 其他函数:
+MYAPP.foo = function () {
+    return 'foo';
+};
+
+// export {MYAPP}
+
+// MYAPP --> default
+export default MYAPP

skills/javascript/test.js

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+// function sum (x , y) {
+//     return x + y
+// }
+
+// console.log(sum(1, 10)) 
+
+// var person = {name: '小明', age: 23}
+
+// console.log(person)
+
+// person.greet = function() {
+//     console.log(`hello, my name is ${this.name}, age ${this.age}`)
+// }
+// person.greet()
+
+
+// var name = '李四'
+// var age = 23
+
+// function greet () {
+//     console.log(`hello, my name is ${name}, age ${age}`)
+// }
+
+// greet()
+
+
+// fn = function (x , y) {
+//     return x + y
+// }
+// console.log(fn(1,2)) 
+
+
+// fn = (x, y) => {
+//     return x + y
+// }
+// console.log(fn(1,2)) 
+
+// fn = (x, y) => { return x + y}
+// console.log(fn(1,2)) 
+
+// fn = (x, y) => x + y
+// console.log(fn(1,2)) 
+
+// pow = x => x * x
+
+// console.log(pow(100))
+
+// pkg
+import {firstName, sum as my_sum} from './tool.mjs'
+console.log(my_sum(1,10)) 
+console.log(firstName)
+
+// pkg.
+// import { MYAPP } from './app.mjs'
+// console.log(MYAPP.version)
+
+
+
+// pkg 
+// import { default as MYAPP } from './app.mjs'
+import appPKg from './app.mjs'
+console.log(appPKg.name) 
+
+// for item := rang a {}
+var a = ['A', 'B', 'C'];
+for (var item of a) {
+    // fn(item)
+    console.log(item)
+}
+
+// for k,v := range o {}
+var o = {
+    name: 'Jack',
+    age: 20,
+    city: 'Beijing'
+};
+for (var item of Object.keys(o)) {
+    console.log(item, o[item])
+}
+
+// forEach
+a.forEach((item) => {
+    console.log(item)
+})

skills/javascript/tool.mjs

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+// export var sum = (x, y) => {return x + y}
+export function sum(x, y) {
+    return x + y
+}
+
+var firstName = 'Michael';
+var lastName = 'Jackson';
+var year = 1958;
+
+export {firstName, lastName, year}