Window.self | Web API

在此页

范例
规范
浏览器兼容性
另请参阅
相关话题

Window.self read-only property returns the window itself, as a WindowProxy . 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 工作者 . 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 ).

范例

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

if (window.parent.frames[0] != window.self) {
    // this window is not the first frame in the list
}

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:

var w1 = window;
var w2 = self;
var w3 = window.window;
var w4 = window.self;
// w1, w2, w3, w4 all strictly equal, but only w2 will function in workers

规范

规范	状态	注释
HTML 实时标准 The definition of 'Window.self' in that specification.	实时标准	No difference from the latest snapshot HTML 5.1
HTML 5.1 The definition of 'Window.self' in that specification.	推荐	No difference from the HTML5
HTML5 The definition of 'Window.self' in that specification.	推荐	First snapshot containing the definition of `Window.self` .

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`self`	Chrome Yes	Edge 12	Firefox Yes	IE Yes	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

图例

完整支持

另请参阅

Its Worker equivalent, WorkerGlobalScope.self .

元数据

最后修改： Mar 18, 2019

在此页

范例

规范

浏览器兼容性

图例

另请参阅

相关话题