我创建了一个在索引数据库中存储数据的函数:
var request = window.indexedDB.open("mynewDB", 1);
request.onupgradeneeded = function(event) {
var db = event.target.result;
var objectStore = db.createObjectStore("toDoList", {keyPath: 'key', autoIncrement: true});
var txn = event.target.transaction;
var addRequest = txn.objectStore("toDoList").add({value: storagedata});
}
(仅供参考:storagedata填充了base64字符串)
如果我通过按钮执行此功能,则变量storagedata的内容位于IndexedDB中。但是如果我想再次按下按钮将另一个值存储到IndexedDB中,则没有任何反应。
除此之外如果我执行该函数第二次函数跳转到行request.onupgradeneeded = function(event) {
到文件“intervalTrigger-dbg.js”的超时来编码clearTimeout(this._delayedCallId);
我做了什么来解决这个问题:在浏览器中调试并阅读有关indexeddb的大量文档。
我自己解决了这个问题。对于想要了解其工作原理的每个人:
var request = window.indexedDB.open("yourDB-1", 1);
var db;
var transaction;
var store;
request.onupgradeneeded = function(event) {
var db = event.target.result;
var transaction = event.target.transaction;
var store = db.createObjectStore("yourDB", {keyPath: 'key', autoIncrement: true});
}
request.onerror = function (event) {
console.log("Here is a error: " + event.target.errorCode);
}
request.onsuccess = function (event) {
db = request.result;
transaction = db.transaction("yourDB", "readwrite");
store = transaction.objectStore("yourDB");
db.onerror = function(event){
console.log("ERROR" + event.target.errorCode);
}
store.put({value: storagedata});
transaction.complete = function() {
db.close();
}
}