两个日期换算成还剩多久时间

function timeFormat(startTime, endTime) {

var date1 = new Date(startTime); //开始时间

var date2 = new Date(endTime); //结束时间

var date3 = date2.getTime() - date1.getTime(); //时间差的毫秒数

//计算出相差天数

var days = Math.floor(date3 / (24 * 3600 * 1000));

//计算出小时数

var leave1 = date3 % (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);

if (days != 0 && hours != 0) {

return "处理时间" + days + "天" + hours + "小时";

} else if(days != 0 && hours == 0){

return "处理时间" + days + "天";

}

else if (days == 0 && hours != 0 && minutes != 0) {

return "处理时间" + hours + "小时" + minutes + "分钟";

} else if (days == 0 && hours == 0 && minutes != 0) {

return "处理时间" + minutes + "分钟";

}else{

return "处理时间" + seconds +"秒";

}

},