// 指定类型

function add(x:number,y:number):string {

return (x+y).toString();

}

var myAdd = function(x:number,y:string):string {

return x+y;

}

var myAddTs:(name:string,age:number)=>number = function(n:string,a:number):number {

return a;

}

// 可选参数

function buildName(firstName:string,lastName?:string) {

if(lastName){

return lastName+" "+firstName;

}else{

return firstName;

}

}

var result1 = buildName("jianfeng","sun");

var result2 = buildName("jianfeng");

// 默认参数

function buildName2(firstName:string,lastName="sun") {

return lastName+" "+firstName;

}

var result3 = buildName("jianfeng","sun");

var result4 = buildName("jianfeng");

// 可变参数

function peopleName(firstName:string, ...restOfName:string[]) {

return firstName+" "+restOfName.join("-");

}

var pn = peopleName("sunshine","sun","jianfeng");

// lambada & this

var people = {

name:["sun","jianfeng","csxiaoyao"],

getName:function() {

return ()=>{ // lambada

var i = 1;

return {

n:this.name[i]

}

}

}

}

var p = people.getName();

alert( p().n );

// reload

function attr(name:string):string;

function attr(age:number):number;

function attr(nameOrAge:any):any{

if(nameOrAge && typeof nameOrAge === "string"){

alert("姓名");

}else{

alert("年龄");

}

}

attr("csxiaoyao"); // 姓名

attr(25); // 年龄