//计算出相差天数
var days = Math.floor(time_diff / (24 3600 1000));
if (days > 0) {
diff += days + '天';
}
//计算出小时数
var leave1 = time_diff % ( 24 3600 1000);
var hours = Math.floor(leave1 / (3600 1000));
if (hours > 0) {
diff += hours + '小时';
} else {
if (diff !== '') {
diff += hours + '小时';
}
}
//计算相差分钟数
var leave2 =leave1 % (3600 1000);
var minutes = Math.floor(leave2 / (60 1000));
if (minutes > 0) {
diff += minutes + '分';
} else {
if (diff !== '') {
diff += minutes + '分';
}
}
//计算相差秒数
var leave3 = leave2%(601000);
var seconds = Math.round(leave3/1000);
if (seconds > 0) {
diff += seconds + '秒';
} else {
if (diff !== '') {
diff += seconds + '秒';
}
}

return diff;
}