In housing, situs refers to the distinct area of a residence. It may possibly influence its value, desirability, and the legal principles that implement to buying or advertising it.如果有多个条件并且嵌套判断，一定要考虑清楚所有的情况，否则容易出现预期之外的错误返回，很多情况是漏考虑了某些情况�