destination
只读特性在
Request
interface returns a string describing the type of content being requested.
The string must be one of those found in the
RequestDestination
enumerated type or the empty string, which is the default value.
destination
is used by the
用户代理
to, for example, help determine which set of rules to follow for CORS purposes, or how to navigate any complicated code paths that affect how specific types of request get handled.
These destinations vary substantially in how they operate. Some are simply data receptacles, where the received data is stored for processing later. Others are script-based, in which case the received data is delivered to a script by calling it and passing the data along. Script-based destinations include
<script>
elements, as well as any of the
Worklet
-based destinations (including
AudioWorklet
and
PaintWorklet
), and the
Worker
-based destinations, including
ServiceWorker
and
SharedWorker
.
var destination = request.destination;
A string from the
RequestDestination
enumerated type which indicates the type of content the request is asking for. This type is much broader than the usual document type values (such as
"document"
or
"manifest"
), and may include contextual cues such as
"image"
or
"worker"
or
"audioworklet"
.
In the following snippet, we create a new request using the
Request()
constructor (for an image file in the same directory as the script), then save the request's destination:
var myRequest = new Request('flowers.jpg');
var myDestination = myRequest.destination; // returns the empty string by default
| 规范 | 状态 | 注释 |
|---|---|---|
|
Fetch
The definition of 'destination' in that specification. |
实时标准 | 初始定义 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
destination
|
Chrome 65 | Edge 14 | Firefox 61 | IE No | Opera 52 | Safari 10.1 | WebView Android 65 | Chrome Android 65 | Firefox Android 61 | Opera Android 47 | Safari iOS 10.3 | Samsung Internet Android 9.0 |
完整支持
不支持
实验。期望将来行为有所改变。