JS延时器 定时器 暂停器 中断器

// numberMillis 毫秒 ???function sleep(numberMillis) { ??????var now = new Date(); ??????var exitTime = now.getTime() + numberMillis; ??????while (true) { ???????????now = new Date(); ?????????if (now.getTime() > exitTime){ ?????????????return; ?????????} ??????} ???}