this.session.on('addAnchors', anchors => {                 const anchor = anchors[0]                 const {                     width,                     height                 } = this.data                 console.log('addAnchors')                 if (anchor) {                     this.setData({                         frameShow: true,                         frameX: anchor.origin.x * width,                         frameY: anchor.origin.y * height,                         frameWidth: anchor.size.width * width,                         frameHeight: anchor.size.height * height,                     })                 }             })             this.session.on('updateAnchors', anchors => {                 const anchor = anchors[0]                 const {                     width,                     height                 } = this.data                 if (anchor) {                     this.setData({                         frameX: anchor.origin.x * width,                         frameY: anchor.origin.y * height,                         frameWidth: anchor.size.width * width,                         frameHeight: anchor.size.height * height,                     })                 }             })             this.session.on('removeAnchors', anchors => {                 this.setData({                     frameShow: false,                 })             })

https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/union-id.html 小程序要获取unionid，一定要注册微信开放平台，然后绑定小程序吗？