src/main/java/me/codeboy/common/base/time/CBTimer.java
public long pop() {
        if (count < 0) {
            return -1;
        }
        String key = String.format(Locale.CHINA, TIME_KEY, count);
        count--;
        return pop(key);
    }
public long pop() {
        if (count < 0) {
            return -1;
        }
        String key = String.format(Locale.CHINA, TIME_KEY, count);
        count--;
        return pop(key);
    }
获取最后一个push到当前的时间间隔,如果pop已经弹出了所有的key,返回-1
<p>
与{@link CBTimer#push()}对应
</p>

@return 时间间隔