isNull() 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.
函数“isNull”检查给定值是否为空。
Signature:
typescript
declare function isNull(value: any): boolean;declare function isNull(value: any): boolean;Parameters
| Parameter | Type | Description |
|---|---|---|
| value | any | 参数“value”的类型为“any”，这意味着它可以接受任何数据类型。 |
Returns:
boolean
{boolean} 函数 isNull 返回一个布尔值。
JavaScript
let a =null; isNull(a)// true let a =null; isNull(a)// true