间隔执行fn

fnInterval.js

fnInterval(5, 1000, function (index) {
	console.log(index);
});

/**
 * 间隔执行fn
 * @param  {number}   time  次数
 * @param  {number}   delay 间隔毫秒
 * @param  {Function} fn    fn(index) index从1开始
 */
function fnInterval (time, delay, fn) {
	var index = 1;

	var interval = setInterval(function () {
		fn(index);

		index === time ? clearInterval(interval) : index++;
	}, delay);
}