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试图安慰了group2
成员,因此,结果应该是user2
在这种情况下,如果不存在,它不会显示:火力地堡查询显示的键值是否是真的
{
"users":{
"user1":{
"username":"john",
"groups":{
"group1":true,
"group3":true
}
},
"user2": ...,
}
"groups": {
"group1"{
...
},
"group2"{
"group_name":"Moderators",
"members":{
"user2":true
}
}
}
}
我试着:
const ref = firebase.database().ref('groups');
ref.orderByChild("user2").on("child_added", function (snapshot) {
console.log(snapshot.key)
});
,但没有运气