1 参数

2-1any

//变量可以赋予任何类型的值,赋值完成之后是可以改变的
var s:any = 10;
s ="hello world";

2-2string

var s:string = "hello";

2-3number

var n:number = 10;

2-4boolean

var b:boolean = true;

2-5Array

var arr:string[] = ["hello","world"];
var arr:Array<number> = [1,2,3];  //推荐使用第二种

2-6object

var obj:object = {name:"cheng",age:185}

2-7array-object

var list:Array<object> = [{name:"cheng"}]

2-8function

A.没有返回值的函数

function show():void{
    console.log("hello");
}

B.有返回值的函数

function go():string{
    return "hello world";
}

2-9元祖

给数组每一个元素指定一种类型

var s:[string,number] = ["hello",1];
console.log(s);

2-10枚举类型

定义一个特定的集合

enum Status {
    success=200,
    error=404,
    serverError=500
}
var success:Status = Status.success;
console.log(success)

2-11null-undefined

var num = null;
num =10 //报错