您可以看一下这个例子

{
  "code": "0000",
  "data": {
    "verifySuccess": function() {
      let body = _req.body;
      return body.username === 'admin' && body.password === '123456';
    },
    "userInfo": function() {
      let body = _req.body;
      if (body.username === 'admin' && body.password === '123456') {
        return Mock.mock({
          username: "admin",
          email: "@email",
          address: "@address"
        });
      } else {
        return null;
      }
    },
  },
  "desc": "成功"
}