主题：盈亏曲线图

不好判断每个星期的最后一天

每个星期第一天可用 weekday<ref(weekday,1)来判断，但是不一定有效

这是向后判断，不行的

nn:=weekday<ref(weekday,1);

drawtext(nn,close,numtostr(month,0)+'月'+numtostr(day,0)+'日');

nn:=barslast(weekday<ref(weekday,1))+1;

总:valuewhen(nn=5,sum(盈亏,5));

nn:=barslast(weekday<ref(weekday,1))+1;

总:valuewhen(nn=5,sum(盈亏,5));

drawtext(nn=5,close,numtostr(总,2));