ES6生成器函数斐波那契数列

function* fib() {
	let [num1,num2] = [0,1];
	for(;;){
		yield num2;
		[num1,num2]=[num2,num1+num2];
	}
}
for(let num of fib()){
	if(num>10000){break;}
	console.log(num);
}