为什么报错movie 未定义呢？

来源：13-9 电影详情页面（1）获取电影详情数据

慕函数311512

2021-05-19

properties: {
movie:Object
},
methods: {
onGoToDetail(event){
console.log(event.properties.movie.id)
// const mid=event.properties.movie.id
wx.navigateTo({
url:’/pages/movie-detail/movie-detail?mid=’+mid
})
}
}
报错：
TypeError: Cannot read property ‘movie’ of undefined
at se.onGoToDetail (index.js? [sm]:22)
at Object.n.safeCallback (VM2429 WAService.js:2)
at VM2429 WAService.js:2
at a (VM2429 WAService.js:2)
at VM2429 WAService.js:2
at n (VM2429 WAService.js:2)
at VM2429 WAService.js:2
at VM2429 WAService.js:2
at i (VM8 asdebug.js:1)
at c (VM8 asdebug.js:1)