5：获取微信公众号全局唯一接口凭证的url:https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=wx5accef030a19cd6b&secret=28a03cb9604ab5116b41e7a44fbab0a6 
 ; 结果：{"access_token":"98_RPq7nal65gIW9DdTfUEAFXapnX0RA5CWN0IwuhyIf9he2V6-3elBm2vzxbEZ5l4ktWEgIxIEigcELT9v-V9v2hQkalH5FtE_6l7tNEaDpHh8cDN-U0re-z3BtEIQUEcAEADHR","expires_in":7200,"errcode":null,"errmsg":null}