【微信分享】H5页在微信内打开，进入分享操作时，获取ticket，偶发返回null

获取ticket接口

https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=45_7UItIpChFVO1OWQfh6DNBmtbHRbmswM4t-1W_9FUQ5RGJR6DMWa1kGvEhLaSRmd51n0e1KHqi_paaCpiNEHnce9ijrr46PcB3qYal4HSxlzcBTGrX8wHBedMM8an_ER4JuGr8kJRfVMorL5LKTPdABAZIE&type=jsapi