谁能帮我解释下这段代码的意思啊？

修撒拉(methusel@tj)

  这里我不明白 flag.prepare = 4 和 flag.prepare = flag.prepare +5
flag.prepare 这个东西主要控制什么的？？？
   

  if not flag.prepare or type(flag.prepare)~='number' then flag.prepare=0 end
   if condition.busy and condition.busy>20 and job.prepare and job.prepare~=test and flag.prepare>0 then flag.prepare=4 end
   if condition.busy and condition.busy==0 and job.prepare and job.prepare~=test and flag.prepare>0 then flag.prepare=flag.prepare+5 end
   if job.prepare==duHhe_start or job.prepare==duCjiang_start then flag.prepare=0 end
   if flag.prepare>4 then flag.prepare=0 end

风起云涌(fqyy@tj)

判断是否有任务busy执行某设置job， 去你代码里 找找 job.prepare是干啥的吧。