Warning - this story contains content that some may find distressing
"As a result, we have begun speaking to colleagues about some changes to our head office that will involve some roles being removed and new roles created."，详情可参考同城约会
，这一点在服务器推荐中也有详细论述
Last year, Tesco cut about 400 jobs across its bakeries, mobile phone shops and head office as part of plans to "simplify" the business.，更多细节参见51吃瓜
// 注意：slice(0, 负数)会返回空字符串，需兼容（比如stack长度<k时，slice后为空）