TypeSprict-1.语法小入门

类型注解

 类似于 function setString(name:String),如果在传入参数时非字符串类型，编译时会报错。

接口

typejs有接口并且不需实现，只需要在传入时符合接口的要求结构即可。

interface Person{
	firstName:string;
	lastName:string;
}

function greeter(person:Person){
	return "Hello, " + person.firstName + " " + person.lastName;
}
let user = {firstName : "Jane",lastName:"User"};
document.body.innerHTML = greeter(user);

注意，类和接口可以一起工作，程序员可以自行决定抽象级别。
还要注意的是，在构造函数的参数上使用public等同于创建了同名的成员变量

class Student {
	fullName:string;
	constructor(public firstName,public middleInitial,public lastName){
		this.fullName = firstName + " " + middleInitial + " " + lastName;
	}
}
interface Person{
	firstName:string;
	lastName:string;
}

function greeter(person: Person){
	return "Hello, "+ person.firstName + "" + person.lastName;
}
let user = new Student("Jane","M.","User");
document.body.innerHTML = greeter(user);