--- title: Request.context slug: orphaned/Web/API/Request/context translation_of: Web/API/Request/context original_slug: Web/API/Request/context ---
{{APIRef("Fetch")}}{{deprecated_header()}}

The deprecated 弃用context所述的只读属性{{domxref("请求")}}接口包含请求的上下文（例如，audio，image，iframe）。这定义了要获取的资源类型。它已由{{domxref("Request.destination”，“ destination")}}属性取代。 This defines what sort of resource is being fetched. This has been replaced by the {{domxref("Request.destination", "destination")}} property.

The context of a request is only relevant in the 请求的上下文仅与ServiceWorker API相关；服务人员可以根据URL是用于图像还是可嵌入对象（例如{{htmlelement("视频")}}，{{domxref("iframe")}}等）进行决策。; a service worker can make decisions based on whether the URL is for an image, or an embeddable object such as a {{htmlelement("video")}}, {{domxref("iframe")}}, etc.

Note注意：您可以在“ 获取规范请求上下文”部分中找到不同可用上下文的完整列表，包括关联的上下文框架类型，CSP指令和平台功能示例。 section.

Syntax

var myContext = request.context;

Value

A {{domxref("RequestContext")}} value.一个{{domxref("RequestContext")}}值。

Example例子

In the following snippet, we create a new request using the {{domxref("Request.Request()")}} constructor (for an image file in the same directory as the script), then save the request context in a variable:在以下代码段中，我们使用{{domxref("Request.Request（）")}}}构造函数创建一个新请求（用于与脚本位于同一目录中的图像文件），然后将请求上下文保存在变量中：

var myRequest = new Request('flowers.jpg');
var myContext = myRequest.context; // returns the empty string by default

Browser compatibility浏览器兼容性

{{Compat("api.Request.context")}}

更多