微信小程序私密消息

1.小程序默认是没有转发功能，除非你实现页面的onShareAppMessage函数

2.通过wx.showShareMenu(Object object)可以控制弹出分享的时候显示什么按钮，注意这个函数不是弹出分享窗口

3.参考官方api文档，设置为私密消息：
wx.updateShareMenu(Object object)
https://developers.weixin.qq.com/miniprogram/dev/api/share/wx.updateShareMenu.html

wx.updateShareMenu({withShareTicket: true,isPrivateMessage: true, activityId: activityId,
})

其中activityId参考api文档从服务端获取

经过这一步后分享出去的小程序就都不能再二次转发。

4.验证私密消息
wx.authPrivateMessage(Object object)
https://developers.weixin.qq.com/miniprogram/dev/api/share/wx.authPrivateMessage.html

wx.authPrivateMessage({shareTicket: 'xxxxxx',success(res) {console.log('authPrivateMessage success', res)// res// {//   errMsg: 'authPrivateMessage:ok'//   valid: true//   iv: 'xxxx',//   encryptedData: 'xxxxxx'// }},fail(res) {console.log('authPrivateMessage fail', res)}
})

验证正确就会进入success，错误进入fail 

问题：这里有个参数shareTicket，从哪里拿？

方法1：

App({onLaunch(options) {console.log("onLaunch",options)}
})

app.js的onLaunch 

方法2：

Object wx.getEnterOptionsSync()

Object wx.getEnterOptionsSync() | 微信开放文档 

    const xx = wx.getEnterOptionsSync();console.log("xx",xx)wx.authPrivateMessage({shareTicket: xx.shareTicket,success(res) {console.log('authPrivateMessage success', res)// res// {//   errMsg: 'authPrivateMessage:ok'//   valid: true//   iv: 'xxxx',//   encryptedData: 'xxxxxx'// }},fail(res) {console.log('authPrivateMessage fail', res)}})