1回答

ustbhuangyi

2021-03-12

已采纳

在 lib.es5.d.ts 中有定义

interface Promise<T> {
   /**
    * Attaches callbacks for the resolution and/or rejection of the Promise.
    * @param onfulfilled The callback to execute when the Promise is resolved.
    * @param onrejected The callback to execute when the Promise is rejected.
    * @returns A Promise for the completion of which ever callback is executed.
    */
   then<TResult1 = T, TResult2 = never>(onfulfilled?: ((value: T) => TResult1 | PromiseLike<TResult1>) | undefined | null, onrejected?: ((reason: any) => TResult2 | PromiseLike<TResult2>) | undefined | null): Promise<TResult1 | TResult2>;

   /**
    * Attaches a callback for only the rejection of the Promise.
    * @param onrejected The callback to execute when the Promise is rejected.
    * @returns A Promise for the completion of the callback.
    */
   catch<TResult = never>(onrejected?: ((reason: any) => TResult | PromiseLike<TResult>) | undefined | null): Promise<T | TResult>;
}

建议用到了进去查一查就好了

0

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慕粉6137024

OK！老师回复的速度真快~超赞

2021-03-12

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