{"-L0bFExUeZXB3-MUXCda":{"Comment":"GOOD","Date":"18 December","User":"OlaNord"}}
{"-L0bFCJh5SPUOWMjTRKu":{"Comment":"ok","Date":"18 December","User":"OlaNord"}}
{"-L0bFA2uzsGDizxxzN1p":{"Comment":"wewwe","Date":"18 December","User":"OlaNord"}}
我里面有一些objects
阵列。我需要访问不同的values
。当我尝试检索key
名称时,我得到undefined
。
这是我的代码:
// Path for selected category
var categoryRef = firebase.database().ref("forum/" + currentCategory);
categoryRef.once("value", function(snapshot) {
firebase.auth().onAuthStateChanged(user => {
var key = user.uid;
var postComments = [];
for (var key in snapshot.val()) {
var comments = snapshot.val()[key]['comments'];
postComments.push(comments);
}
})
})
您可以尝试访问下面的注释,如果您发布的数组可以迭代如下:
var data = [{
"-L0bFExUeZXB3-MUXCda": {
"Comment": "GOOD",
"Date": "18 December",
"User": "OlaNord"
}
},
{
"-L0bFCJh5SPUOWMjTRKu": {
"Comment": "ok",
"Date": "18 December",
"User": "OlaNord"
}
},
{
"-L0bFA2uzsGDizxxzN1p": {
"Comment": "wewwe",
"Date": "18 December",
"User": "OlaNord"
}
}
]
var postComments = [];
for (var key of data) {
for (var values in key) {
console.log(key[values].Comment) //access the comment
postComments.push(key[values].Comment);
}
}
console.log(postComments);
// Path for selected category
var categoryRef = firebase.database().ref("forum/" + currentCategory);
categoryRef.once("value", function(snapshot) {
firebase.auth().onAuthStateChanged(user => {
var key = user.uid;
var postComments = [];
for (var key in snapshot.val()) {
var comments = snapshot.val()[key]['Comment'];
//CHange key Name
postComments.push(comments);
}
})
})
您可以使用Object.values
访问键内的值。
var data = [{"-L0bFExUeZXB3-MUXCda":{"Comment":"GOOD","Date":"18 December","User":"OlaNord"}},{"-L0bFCJh5SPUOWMjTRKu":{"Comment":"ok","Date":"18 December","User":"OlaNord"}},{"-L0bFA2uzsGDizxxzN1p":{"Comment":"wewwe","Date":"18 December","User":"OlaNord"}}];
var result = data.reduce((r,o) => r.concat(Object.values(o).map(({Comment}) => Comment)),[]);
console.log(result);