JView UIHome > @jview/utils > isDefined
isDefined() function
判断变量是否有具体定义，即非null,非undefined
Signature:
typescript
export declare function isDefined(val: unknown): boolean;export declare function isDefined(val: unknown): boolean;Parameters
| Parameter | Type | Description |
|---|---|---|
| val | unknown | 变量值 |
Returns:
boolean