移动端网页 使用map报错 求大神指点啊

index.umd.min.js:1 [system] TypeError: i.LatLng is not a constructor
at VueComponent.init (index.umd.min.js:1)
at index.umd.min.js:1
at VueComponent.loadMap (index.umd.min.js:1)
at VueComponent.mounted (index.umd.min.js:1)
at invokeWithErrorHandling (vue.runtime.esm.js:1854)
at callHook (vue.runtime.esm.js:4218)
at Object.insert (vue.runtime.esm.js:3144)
at invokeInsertHook (vue.runtime.esm.js:6345)
at VueComponent.patch [as patch] (vue.runtime.esm.js:6564)
at VueComponent.Vue._update (vue.runtime.esm.js:3947)
我是这样写的 <map style="width:70%; height: 400upx;margin: 20upx 15%;" :latitude="latitude" :longitude="longitude" ></map>
data（）{
return {
latitude: 39.909,
longitude: 116.39742,}
}