http://wiki.open.qq.com/wiki/%E6%8A%80%E6%9C%AF%E4%BC%98%E5%8C%96%E5%8E%9F%E5%88%99#2.4.09.E6.94.BE.E5.BC.83.E4.B8.8D.E9.87.8D.E8.A6.81.E6.95.B0.E6.8D.AE.E7.9A.84.E6.95.B0.E6.8D.AE.E5.AE.89.E5.85.A8.E6.80.A7
https://doc.open.alipay.com/docs/doc.htm?treeId=275&articleId=105912&docType=1