1# 验证示例代码同源--异常场景5 2 3 4## 文档代码块中，id重复（但是引用的内容一致),验证扫描结果 5 6doc此段代码将ID写错了 7 8```ts 9const promise: Promise<number> = new Promise((resolve: Function, reject: Function) => { 10 setTimeout(() => { 11 const randomNumber: number = Math.random(); 12 if (randomNumber > 0.5) { 13 resolve(randomNumber); 14 } else { 15 reject(new Error('Random number is too small')); 16 } 17 }, 1000); 18}) 19``` 20<!--@[async_await_sync_operation](https://gitcode.com/openharmony/applications_app_samples/blob/master/code/DocsSample/ArkTs/ArkTsConcurrent/AsyncConcurrencyOverview/entry/src/main/ets/pages/Index.ets)--> 21 22 23``` 24async function myAsyncFunction(): Promise<string> { 25 const result: string = await new Promise((resolve: Function) => { 26 setTimeout(() => { 27 resolve('Hello, world!'); 28 }, 3000); 29 }); 30 console.info(result); // 输出： Hello, world! 31 return result; 32} 33 34@Entry 35@Component 36struct PromiseAsyncAwait { 37 @State message: string = 'Hello World'; 38 39 build() { 40 Row() { 41 Column() { 42 Text(this.message) 43 .fontSize(50) 44 .fontWeight(FontWeight.Bold) 45 .onClick(async () => { 46 let res = await myAsyncFunction(); 47 console.info('res is: ' + res); 48 }) 49 } 50 .width('100%') 51 } 52 .height('100%') 53 } 54} 55``` 56<!--@[async_await_sync_operation](https://gitcode.com/openharmony/applications_app_samples/blob/master/code/DocsSample/ArkTs/ArkTsConcurrent/AsyncConcurrencyOverview/entry/src/main/ets/pages/Index.ets)--> 57 58 59 60## 嵌套的ID，docs中不含嵌套部分 61 62```ts 63import { BusinessError } from '@kit.BasicServicesKit'; 64promise.then((result: number) => { 65 console.info(`Random number is ${result}`); 66}).catch((error: BusinessError) => { 67 console.error(error.message); 68}); 69``` 70<!--@[promise_then_catch_handling](https://gitcode.com/openharmony/applications_app_samples/blob/master/code/DocsSample/ArkTs/ArkTsConcurrent/AsyncConcurrencyOverview/entry/src/main/ets/pages/Index.ets)-->