js定时器 timer

function timer(step) {
    var startTime = new Date().getTime();
    var endTime = new Date().getTime();
    while (endTime - startTime < step) {
        endTime = new Date().getTime();
    }
//出自http://www.cnblogs.com/ahjesus 尊重作者辛苦劳动成果,转载请注明出处,谢谢!
    return;
}