JS 延迟加载

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

 

来源：https://www.cnblogs.com/chenyanbin/p/12361443.html