Typescript的函数的使用

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命名函数

function add(x:number,y:number):string{    return 'hello typescript';}

匿名函数var myAdd=function(x:number,y:number):string{    return 'hello typescript';}

指定函数的参数意义
var myDoc:(name:string,age:number)=>number=function(n:string,a:number):number{    return a;}

函数的可选参数
function buildName(firstName:string,lastName?:string){    if(lastName){        return firstName+" "+lastName;    }else{        return firstName;    }}var result1=buildName("jason","john");var result2=buildName("jason");

函数的默认参数
function buildName(firstName:string,lastName="john"){    return firstName+" "+lastName;}var result1=buildName("jason");var result2=buildName("jason","mike");

函数的可变参数
function peopleName(firstName:string,...resetName:string[]){    return firstName+" "+resetName.join("-");}var result=peopleName("jason","blue","blond","issie","danny");document.getElementById("pid").innerHTML=result;

lambads和this关键字的使用var people={    name:["jason","issie","danny","blue"],    getName:function(){        return ()=>{            var i=Math.floor(Math.random()*4);            return {                n:this.name[i]            }        }    }}var myName=people.getName();alert("名字："+myName().n);
函数的重载
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("jason");attr(10);

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