小程序setData设置属性值之前获取this设置的属性已经被改变了但是不可用求解

如何看待微信公开课小程序热门讨论「小程序setData设置属性值之前获取this设置的属性已经被改变了但是不可用求解」
摘要：小程序setData设置属性值之前获取this设置的属性已经被改变了但是不可用求解
展开：onLoad:function(options){varthatthis;console.log(that)console.log(that:++roomid:+that.data.roomId++hotelid:+that.data.hotelId)／／这里才设置为什么前面的that属性值已经被改变了，但是不可用that.setData({roomId:options.roomId,hotelId:options.hotelId})console.log(this:++roomid:+that.data.roomId++hotelid:+that.data.hotelId)},／／console.log(that)e{data:{…},onLoad:ƒ,onReady:ƒ,…}data:{roomId:8d112e2b5a234b3aaf9915ee6fc30dac,hotelId:c9633c5cd6b44723a1e39a2770d058a4,__webviewId__:209}onHide:ƒ()onLoad:ƒ()onPullDownRefresh:ƒ()onReachBottom:ƒ()onReady:ƒ()onRouteEnd:ƒ()onShareAppMessage:ƒ()onShow:ƒ()onUnload:ƒ()options:{roomId:8d112e2b5a234b3aaf9915ee6fc30dac,hotelId:c9633c5cd6b44723a1e39a2770d058a4}route:pages/roomdetail/roomdetail__route__:()__wxWebviewId__:()get__route__:ƒ()set__route__:ƒ()get__wxWebviewId__:ƒ()set__wxWebviewId__:ƒ()__proto__:Object／／console.log(that:++roomid:+that.data.roomId++hotelid:+that.data.hotelId)roomdetail.js?[sm]:18that:roomid:hotelid:／／console.log(this:++roomid:+that.data.roomId++hotelid:+that.data.hotelId)roomdetail.js?[sm]:23this:roomid:8d112e2b5a234b3aaf9915ee6fc30dachotelid:c9633c5cd6b44723a1e39a2770d058a4求解为什么第一个that里面会无缘无故有roomId和hotelId的我明明在打印后才设置的啊！基础不扎实这个是什么原因了解更多