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我想從Firebase數據庫中迭代項目的集合,然後將其存儲在本地存儲中,但似乎無法找出錯誤。我實際上已經閱讀過文檔,但仍然沒有弄清楚爲什麼代碼不起作用。循環訪問Firebase數據庫記錄
下面是我的代碼:
dataRef.once("value", function(snapshot) {
snapshot.forEach(function(childSnapshot) {
var hymn_no = childSnapshot.val().hymn_no;
var hymn_category = childSnapshot.val().hymn_category;
var hymn_key = childSnapshot.val().hymn_key ;
var hymn_title = childSnapshot.val().hymn_title;
var hymn_verses = childSnapshot.val().hymn_verse;
var hymn_chorus = childSnapshot.val().hymn_chorus;
var hymn_author = childSnapshot.val().hymn_author;
console.log(hymn_no);
console.log(hymn_category);
console.log(hymn_key);
console.log(hymn_title);
console.log(hymn_verses);
console.log(hymn_chorus);
console.log(hymn_author);
var hymns = [
new Hymn({
"hymn_no": hymn_no,
"hymn_category": hymn_category,
"hymn_key": hymn_key,
"hymn_title": hymn_title,
"hymn_chorus": hymn_chorus,
"hymn_verses": hymn_verses,
"hymn_author": hymn_author,
}),
];
localStorage.setItem("Hymns", JSON.stringify(hymns));
return JSON.parse(localStorage.getItem("Hymns"));
});
});