window.self

Window.self 読み取り専用プロパティは、WindowProxy のように、ウィンドウ自身を返します。 It can be used with dot notation on a window object (that is, window.self) or standalone (self). The advantage of the standalone notation is that a similar notation exists for non-window contexts, such as in Web Workers. By using self, you can refer to the global scope in a way that will work not only in a window context (self will resolve to window.self) but also in a worker context (self will then resolve to WorkerGlobalScope.self).

構文

var w = window.self;  // w === window

例

Uses of window.self like the following could just as well be replaced by window.

if (window.parent.frames[0] != window.self) {
  // このウィンドウは、一覧における一番最初のフレームではありません。
}

Furthermore, when executing in the active document of a browsing context, window is a reference to the current global object and thus all of the following are equivalent:

仕様

ブラウザー互換性

関連

• Its Worker equivalent, WorkerGlobalScope.self.