http://i.sf-express.com/weiwap/showroute.html?bno=单号

可以通过curl以post形式访问http://i.sf-express.com/service/weixin/checkroute，传参——bno:运单号，device:routeInfo，取回的结果类似：

{"mailno":"运单号",
"stepList":[
{"alias":null,"remark":"已收件","acceptTime":"2014?09?04 16:23:44","acceptAddress":"广州市"},
{"alias":null,"remark":"快件在广州\t装车, 准备送往下一站广州集散中心","acceptTime":"2014?09?04 18:54:22","acceptAddress":"广州市"},
{"alias":null,"remark":"快件在广州集散中心装车","acceptTime":"2014?09?04 20:08:44","acceptAddress":"广州市"}
]}