As shown below, the primary key of a piece of data I stored is timeStamp. What I know is that this data can be found by getting the primary key value, but cannot the data be retrieved by querying other values in it? Can query conditions similar to SQL statements not be implemented? (Find them all and then iterate through the results to eliminate them)

db.createObjectStore('book', { keyPath: "timeStamp" }); store.get(1496251171844)

Some people say to use an index, but the index cannot be queried based on the value. I still need to make a judgment. What I
want is to directly store.get(group) to get the specified object storage. group

var book = db.createObjectStore('book', { keyPath: "timeStamp" }); // 建立索引 book.createIndex("groupId","groupId", {unique:false}); -------------------------------------------------------- html5.indexedDB.getFromId = function(groud, callback){ var db = html5rocks.indexedDB.db; var tx = db.transaction(['book'],'readwrite'); var store = tx.objectStore('book'); var index = store.index("groupId"); request = index.openCursor(); request.onsuccess = function(event){ var result = event.target.result; if(!result){return;} if(result.value.groupId == groud){ callback(result.value); } result.continue(); }; };