如何将到期时间应用于HTML5 indexeddb中的键？

是的,Scott Marcus和dgrogan说的是什么.还有一个提示：如果在时间戳上创建索引,则可以在“过期”值范围内迭代游标,并在打开数据库后删除它们.

var open = indexedDB.open('demo');
open.onupgradeneeded = function() {
  var db = open.result;
  var store = db.createObjectStore('store');
  var index = store.createIndex('timestamp','timestamp');

  // Populate with some dummy data,with about half from the past:
  for (var id = 0; id < 20; ++id) {
    store.put({
      value: Math.random(),timestamp: new Date(Date.Now() + (Math.random()-0.5) * 10000)
    },id);
  }
};
open.onsuccess = function() {
  var db = open.result;
  var tx = db.transaction('store','readwrite');

  // Anything in the past:
  var range = IDBKeyRange.upperBound(new Date());

  tx.objectStore('store').index('timestamp').opencursor(rangE)
    .onsuccess = function(E) {
      var cursor = e.target.result;
      if (!cursor) return;
      console.log('deleting: ' + cursor.key);
      cursor.delete();
      cursor.conTinue();
    };

  // This transaction will run after the first commits since
  // it has overlapping scope:
  var tx2 = db.transaction('store');
  tx2.objectStore('store').count().onsuccess = function(E) {
    console.log('records remaining: ' + e.target.result);
  };
};