- js
isNan()
**判断是不是一个数字
* Returns a Boolean value that indicates whether a value is the reserved value NaN (not a number).
* @param number A numeric value.
*/
declare function isNaN(number: number): boolean;
- js
isNan()
**判断是不是一个数字
* Returns a Boolean value that indicates whether a value is the reserved value NaN (not a number).
* @param number A numeric value.
*/
declare function isNaN(number: number): boolean;
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