仅记录了和c++有所不同之处，其余类似。 

---

一段简单代码

// 关注点分离，指html页面设计和javascript页面行为分离// 对象，键值对形式
const user = {name: "gyf",age: 20,jobs: ["front-end", "engineer", 2, true],container: {frontEnd: "前端",backend: ["python", "java"],},
};
//console.log(user);// 对象数组
let todos = [{id: 1,text: "前端",isCompleted: true,},{id: 2,text: "后端",isCompleted: false,},{id: 3,text: "全栈",isCompleted: false,},
];
console.log("Learnt front-end or not? -" + todos[0].isCompleted);// 对象数组转json
const todoJSON = JSON.stringify(todos);
//console.log(todoJSON);// 函数
function self_intro() {//console.log("My name is " + user.name + " who is a " + user.jobs);const hello = `Though I'm only ${user.age} years old, I have little hair.`; //esc下面的单引号console.log(hello.toUpperCase() + " (" + hello.length + " words)");
}function time() {let time = Date.now();console.log(time);console.log("The time is " + Date(time));
}function selection() {// 三目运算符const judge = todos[1].id === 10 ? "id is 10." : "id is not 10.";console.log(judge);// 循环for (let todo of todos) {console.log("Count! " + todo.text);}
}self_intro();
time();
selection();

node 快速运行 .js

先检查是否安装node 

node --version

 跳出如下结果

在vscode新建终端，运行 node script.js ： 

对象数组转 Jason

Jason是一种数据格式，经常用于api、服务器数据传输。

可以用代码转换，可以使用在线转换器Free Online JSON Formatter - FreeFormatter.com

将对象数组粘贴在文本框里，就可以获得jason格式数据，如下：