Function withTimeout

withTimeout<T>(promise: Promise<T>, ms: number): Promise<T>
让 Promise 与超时竞争，超时后抛出错误
Type Parameters
- T
Parameters
- promise: Promise<T>
  目标 Promise
- ms: number
  超时毫秒数，超时后以 Error('Timeout after <ms>ms') reject
Returns Promise<T>
与超时竞速的新 Promise
Example
```
const result = await withTimeout(fetchData(), 5000)
```
- Defined in async.ts:87