function diffTime(startDate,endDate) { 
    startDate= new Date(startDate);
    endDate = new Date(endDate);
    var diff=endDate.getTime() - startDate.getTime();//时间差的毫秒数 
    //计算出相差天数 
    var days=Math.floor(diff/(24*3600*1000));
    //计算出小时数 
    var leave1=diff%(24*3600*1000);    //计算天数后剩余的毫秒数 
    var hours=Math.floor(leave1/(3600*1000)); 
    //计算相差分钟数 
    var leave2=leave1%(3600*1000);        //计算小时数后剩余的毫秒数 
    var minutes=Math.floor(leave2/(60*1000));
    //计算相差秒数 
    var leave3=leave2%(60*1000);      //计算分钟数后剩余的毫秒数 
    var seconds=Math.round(leave3/1000); 
    var returnStr = seconds + "秒"; 
    if(minutes>0) { 
        returnStr = minutes + "分" + returnStr; 
    } 
    if(hours>0) { 
        returnStr = hours + "小时" + returnStr;
    } 
    if(days>0) { 
        returnStr = days + "天" + returnStr; 
    } 
    return returnStr; 
}  

function getNowTime() {
    var date = new Date();
    this.year = date.getFullYear();
    this.month = date.getMonth() + 1;
    this.date = date.getDate();
    this.hour = date.getHours() < 10 ? "0" + date.getHours() : date.getHours();
    this.minute = date.getMinutes() < 10 ? "0" + date.getMinutes() : date.getMinutes();
    this.second = date.getSeconds() < 10 ? "0" + date.getSeconds() : date.getSeconds();
    var currentTime = this.year + ‘-‘ + this.month + ‘-‘ + this.date + ‘ ‘ + this.hour + ‘:‘ + this.minute + ‘:‘ + this.second;
    return currentTime;
}