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試圖安慰了group2
成員,因此,結果應該是user2
在這種情況下,如果不存在,它不會顯示:火力地堡查詢顯示的鍵值是否是真的
{
"users":{
"user1":{
"username":"john",
"groups":{
"group1":true,
"group3":true
}
},
"user2": ...,
}
"groups": {
"group1"{
...
},
"group2"{
"group_name":"Moderators",
"members":{
"user2":true
}
}
}
}
我試着:
const ref = firebase.database().ref('groups');
ref.orderByChild("user2").on("child_added", function (snapshot) {
console.log(snapshot.key)
});
,但沒有運氣