VS code typescript 转js

https://www.tslang.cn/docs/handbook/migrating-from-javascript.html

npm install -g typescript

1.新建greeter.ts

var Student = /** @class */ (function () {
    function Student(firstName, middleInitial, lastName) {
        this.firstName = firstName;
        this.middleInitial = middleInitial;
        this.lastName = lastName;
        this.fullName = firstName + " " + middleInitial + " " + lastName;
    }
    return Student;
}());
function greeter(person) {
    return "Hello, " + person.firstName + " " + person.lastName;
}
var user = new Student("Jane", "M.", "User");
document.body.innerHTML = greeter(user);

2.终端中输入命令：      tsc greeter.ts     会生成 greeter.js