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5. Using IndexedDB in chrome

indexedDB API is typically used to store data in the user's browser from content JavaScript.  (See 使用 IndexedDB for an overview.)  However, the APIs can also be accessed from system-privileged JavaScript using the Components.utils.importGlobalProperties() 函数：

Components.utils.importGlobalProperties(["indexedDB"]);
// From here on, it's like using IndexedDB from content
var req = indexedDB.open("my-database");
// ...
			

If you are creating a sandbox, and want indexedDB to be available in it, use the wantGlobalProperties option in the Sandbox 构造函数：

var options = {
  "wantGlobalProperties": ["indexedDB"]
}
var principal = Cc["@mozilla.org/systemprincipal;1"].createInstance(Ci.nsIPrincipal);
var sandbox = Components.utils.Sandbox(principal, options);
// The sandbox will have access to indexedDB
var sandboxScript = 'var req = indexedDB.open("my-database");';
Components.utils.evalInSandbox(sandboxScript, sandbox);
			

Before Firefox 33, you would access indexedDB from chrome code using the initWindowless 方法在 nsIIndexedDatabaseManager service. This method was removed in Firefox 33.

• 最后修改： 2019 年 3 月 23 日