鸿蒙HarmonyOS实战-ArkTS语言基础类库（并发）_arkts线程_arkts单例

import fs from ‘@ohos.file.fs’;
import common from ‘@ohos.app.ability.common’;

async function write(data: string, file: fs.File): Promise {
fs.write(file.fd, data).then((writeLen: number) => {
console.info('write data length is: ’ + writeLen)
}).catch((err) => {
console.error(Failed to write data. Code is ${err.code}, message is ${err.message});
})
}

async function testFunc(): Promise {
let context = getContext() as common.UIAbilityContext;
let filePath: string = context.filesDir + “/test.txt”; // 应用文件路径
let file: fs.File = await fs.open(filePath, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
write(‘Hello World!’, file).then(() => {
console.info(‘Succeeded in writing data.’);
}).catch((err) => {
console.error(Failed to write data. Code is ${err.code}, message is ${err.message});
})
fs.close(file);
}
testFunc();

@Entry
@Component
struct WebComponent {
build() {
Column() {
Text(“Hello World”)
}
}
}

![在这里插入图片描述](https://img-blog.csdnimg.cn/direct/d29e48bddd484a79aa20beccb01abc35.png)


### 3.多线程并发


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