IndexedDB.open 未在 Chrome 上调用回调

Question

我正在尝试使用 IndexedDB，并且一切正常，直到几个小时前我的 .open() 回调停止在 Chrome 上被调用（在 Safari 上测试并且工作正常）。

RT.prototype.setupIndexedDB = function (callback) {
  var dbName = "test";
  var dbVersion = 1;
  var indexedDB = window.indexedDB ||
                  window.webkitIndexedDB ||
                  window.mozIndexedDB;

  console.log("setup indexed db");
  var request = indexedDB.open(dbName, dbVersion);
  request.onsuccess = function(e) {
    console.log("db request success");
  };

  request.onblocked = function(e) {
    console.log("DB open blocked", e);
  };

  request.onerror = function(err) {
    console.log("error", err);
  };

  request.onversionchange = function(err) {
    console.log("onversionchange", err);
  };

  request.onupgradeneeded = function(e) {
    console.log("upgrade needed");
  };
};

我查看了 Chrome 开发人员工具 IndexedDB，但什么也没有...

有人知道发生了什么事吗？

谢谢

编辑：完全重启浏览器就成功了，但我仍然很想知道发生了什么。

Answer 1

您是否正在尝试同时删除数据库？如果存在阻塞的挂起的 deleteDatabase 操作，IndexedDB 可能会进入一个奇怪的（尽管根据规范是正确的）状态。例如。下面的代码。如果一切都失败了，你可以检查 chrome://indexeddb-internals，它会告诉你是否有任何待处理的打开或删除操作正在搞砸。

var request = indexedDB.open("test", 1);
request.onblocked = function(e) {
  console.log("DB open blocked", e);
};

request.onerror = function(err) {
  console.log("DB open error", err);
};

request.onupgradeneeded = function(e) {
  console.log("DB open upgrade needed");
};

request.onsuccess = function(e) {
  db = request.result;
  console.log("DB open success");
  db.onversionchange = function(e) {
    console.log("DB got a versionchange event")
  }
  request = indexedDB.deleteDatabase("test");
  request.onsuccess = function(e) {
    console.log("delete success will not be called")
  }
  request.onblocked = function(e) {
    console.log("delete was blocked");
    request = indexedDB.open("test", 1);
    request.onsuccess = function(e) {
      console.log("success won't be called");
    };
    request.onblocked = function(e) {
      console.log("blocked won't be called", e);
    };
    request.onerror = function(err) {
      console.log("error won't be called", err);
    };
    request.onupgradeneeded = function(e) {
      console.log("upgradeneeded won't be called");
    };
  };
};

IndexedDB.open 未在 Chrome 上调用回调

IndexedDB.open callbacks not called on Chrome

javascript

google-chrome

indexeddb