javascript 无法在“IDBDatabase”上执行“createObjectStore”
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Failed to execute 'createObjectStore' on 'IDBDatabase'
提问by Michael Phelps
why do I have a error ?
为什么我有错误？
My code:
我的代码：
var idb = window.indexedDB || // Use the standard DB API
window.mozIndexedDB || // Or Firefox's early version of it
window.webkitIndexedDB; // Or Chrome's early version
var IDBTransaction = window.IDBTransaction || window.webkitIDBTransaction;
var IDBKeyRange = window.IDBKeyRange || window.webkitIDBKeyRange;
var dbName='nameDb';
var idbRequest=idb.open(dbName,'4.67' /*,dbDescription */);
idbRequest.onsuccess=function (e) {
debugger
var db=e.target.result;
if (!db.objectStoreNames.contains('chat')){
co=db.createObjectStore('chat',{'id':100});
};
if (!db.objectStoreNames.contains('iam')){
co1=db.createObjectStore('iam');
};
};
idbRequest.onerror = function (e) {
debugger
};
Uncaught InvalidStateError: Failed to execute 'createObjectStore' on 'IDBDatabase': The database is not running a version change transaction. index.html:37 idbRequest.onsuccess
未捕获的 InvalidStateError：无法在“IDBDatabase”上执行“createObjectStore”：数据库未运行版本更改事务。index.html:37 idbRequest.onsuccess
回答by Dick van den Brink
You can't create an objectStorein an onsuccessmethod. You can only do this in a upgradeneededevent.
您不能objectStore在onsuccess方法中创建一个。您只能在upgradeneeded事件中执行此操作。
Quote from docs:
来自文档的引用：
When you create a new database or increase the version number of an existing database (by specifying a higher version number than you did previously, when Opening a database), the
onupgradeneededevent will be triggered. In the handler for this event, you should create the object stores needed for this version of the database
当您创建新数据库或增加现有数据库的版本号时（通过指定比以前更高的版本号，在打开数据库时），
onupgradeneeded将触发该事件。在此事件的处理程序中，您应该创建此版本数据库所需的对象存储
See documentation.
请参阅文档。
