Body
The Body
mixin (en-US) of the Fetch API represents the body of the response/request, allowing you to declare what its content type is and how it should be handled.
Body
is implemented by both Request
(en-US) and Response
. This provides these objects with an associated body (a stream), a used flag (initially unset), and a MIME type (initially the empty byte sequence).
Properties
Body.body
(en-US) Read only- A simple getter used to expose a
ReadableStream
(en-US) of the body contents. Body.bodyUsed
(en-US) Read only- A
Boolean
(en-US) that indicates whether the body has been read.
Methods
Body.arrayBuffer()
(en-US)- Takes a
Response
stream and reads it to completion. It returns a promise that resolves with anArrayBuffer
. Body.blob()
(en-US)- Takes a
Response
stream and reads it to completion. It returns a promise that resolves with aBlob
. Body.formData()
(en-US)- Takes a
Response
stream and reads it to completion. It returns a promise that resolves with aFormData
object. Body.json()
- Takes a
Response
stream and reads it to completion. It returns a promise that resolves with the result of parsing the body text asJSON
. Body.text()
(en-US)- Takes a
Response
stream and reads it to completion. It returns a promise that resolves with aUSVString
(en-US) (text). The response is always decoded using UTF-8.
Examples
The example below uses a simple fetch call to grab an image and display it in an <img>
(en-US) tag. You'll notice that since we are requesting an image, we need to run Body.blob()
(en-US) (Response
implements body) to give the response its correct MIME type.
HTML Content
<img class="my-image" src="https://wikipedia.org/static/images/project-logos/frwiki-1.5x.png">
JS Content
var myImage = document.querySelector('.my-image');
fetch('https://upload.wikimedia.org/wikipedia/commons/7/77/Delete_key1.jpg')
.then(res => res.blob())
.then(res => {
var objectURL = URL.createObjectURL(res);
myImage.src = objectURL;
});
規格
{{Specifications}}
瀏覽器相容性
{{Compat}}