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;

}