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关于Firebase有些疑问 #42

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Firebase 的api资料有推荐的吗?这个demo里面有关firebae部分的代码没看懂,如:api.child().on(),api.child().once(),找了很久没找到firebase的api资料。
不知道这里面的items 数据怎么从firebase上下载下来的。
api.child('topstories').on('value', snapshot => {
topStoryIds = snapshot.val()
debugger;
store.emit('topstories-updated')
})

api.child('item/' + id).once('value', snapshot => {
const story = itemsCache[id] = snapshot.val()
resolve(story)
}, reject)

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