Web standards
Edge Functions designs a serverless code execution environment based on the V8 JavaScript engine and provides the following standardized Web APIs.
JavaScript Standard Built-in Objects
Edge Functions supports all JavaScript standard built-in objects. For more information, see Standard built-in objects.
URL
const urlInfo = new URL('https://www.tencentcloud.com/');
The URL API is used to parse, construct, standardize, and encode URLs. For more information, see URL.
Blob
const blob = new Blob(['hello', 'world'], { type: 'text/plain' });
The Blob API represents a file-like object of immutable and raw data. For more information, see Blob.
Base64
btoa
function btoa(data: string | ArrayBuffer | ArrayBufferView): string;
The btoa() method performs Base64 encoding. Unicode strings are not supported. For more information, see btoa().
atob
function atob(data: string): string;
The atob() method performs Base64 decoding. Unicode strings are not supported. For more information, see atob().
btoaUTF8
function btoaUTF8(data: string): string;
The btoaUTF8() method performs Base64 encoding. Unicode strings are supported.
atobUTF8
function atobUTF8(data: string): string;
The atobUTF8() method performs Base64 decoding. Unicode strings are supported.
Timer
setTimeout
setTimeout(func: function): number;setTimeout(func: function, delay: number): number;setTimeout(func: function, delay: number, ...args: any[]): number;
Functioning as an ordinary timer, it executes the designated function upon expiration. For more details, see setTimeout.
clearTimeout
clearTimeout(timeoutID: number): void;
setInterval
setInterval(func: function): number;setInterval(func: function, delay: number): number;setInterval(func: function, delay: number, ...args: any[]): number;
Functioning as a recurring timer, it implemets the designated function upon expiration. For more information, see setInterval.
clearInterval
clearInterval(intervalID: number): void;
setImmediate
setImmediate(func: function): number;setImmediate(func: function, ...args: any[]): number;
Functioning as an immediate timer, it executes the designated function after the EDGE-FUNCTION stack has been cleared. For more information, see setImmediate.
clearImmediate
clearImmediate(immediateID: number): void;
EventTarget and Event
EventTarget
const eventTarget = new EventTarget();
The EventTarget API allows objects to publish and subscribe to events. For more information, see EventTarget.
Event
const event = new Event('type name');
AbortSignal and AbortController
AbortSignal
const signal = AbortSignal.abort();
The AbortSignal API represents a signal object that allows you to stop a request. For more information, see AbortSignal.
AbortController
const controller = new AbortController();
The AbortController API represents a controller object that allows you to stop a request. For more information, see AbortController.
CompressionStream and DecompressionStream
CompressionStream
const { readable, writable } = new CompressionStream('gzip');
CompressionStream supports compression methods including
gzip, deflate, and br. For more details, see CompressionStream.DecompressionStream
const { readable, writable } = new DecompressionStream('gzip');
DecompressionStream supports decompression methods including
gzip, deflate, and br. For more details, see DecompressionStream.