function fn(name,age,sex="男")
{
	console.log(`大家好,我是${name},性別${sex},今年${age}歲!`);
}
fn("劉德華",45); //大家好,我是劉德華,性別男,今年45歲!

function fn(name,sex="男",age)
{
	console.log(`大家好,我是${name},性別${sex},今年${age}歲!`);
}
fn("劉德華",undefined,45); //大家好,我是劉德華,性別男,今年45歲!

function Add(...items)
{
	// let sum = 0;
	// for(let item of items)
	// {
	// 	sum += item;
	// }
	// return sum;
	
	let sum = 0;
	for(var i = 0;i< items.length;i++)
	{
		sum += items[i];
	}
	return sum;
}
let result1 = Add(1,2,3);
let result2 = Add(1,3,5,7,9);
console.log(result1); //6
console.log(result2); //25

let f = ()=>{console.log("hello,world!")}
f(); //hello,world

function f()
{
	console.log("hello,world!");
}
f(); //hello,world

let f = num =>{
	if(num%2 == 0)
		return "偶數(shù)";
	else
		return "奇數(shù)";
}
console.log(f(50)); //偶數(shù)

let f = (a,b)=>{
	let c = a+b;
	return c;
}
console.log(f(2,3)); //5

let f = (a,b) => a+b;
console.log(f(2,3)); // 5

let f = (id,name) => {id: id, name: name};
let obj = f("001","劉德華");  // 報(bào)錯(cuò)
console.log(obj);

let f = (id,name) => {
	return {id: id, name: name};
};
let obj = f("001","劉德華");  
console.log(obj); //{id:"001",name:"劉德華"}

let f = (id,name) => ({id: id, name: name});
let obj = f("001","劉德華");
console.log(obj); //{id:"001",name:"劉德華"}