isPromise() function
This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment.
是否为Promise格式
Signature:
typescript
declare function isPromise(val: any): boolean;declare function isPromise(val: any): boolean;Parameters
| Parameter | Type | Description |
|---|---|---|
| val | any | 参数“val”的类型为“any”，这意味着它可以是任何数据类型。 |
Returns:
boolean
{boolean} - 一个布尔值。
Example
JavaScript
let promise = new Promise(() => {}); isPromise(promise)// true
let str = 'not a promise'; isPromise(str)// false let promise = new Promise(() => {}); isPromise(promise)// true
let str = 'not a promise'; isPromise(str)// false