HarmonyOS 鸿蒙Next 文件保存demo

HarmonyOS 鸿蒙Next 文件保存demo示例代码如下：

import { BusinessError } from '[@ohos](/user/ohos).base';

import picker from '[@ohos](/user/ohos).file.picker';

async function example10() {

  try {

    let documentSaveOptions = new picker.DocumentSaveOptions();

    documentSaveOptions.newFileNames = ['DocumentViewPicker01.txt'];

    let documentPicker = new picker.DocumentViewPicker();

    documentPicker.save(documentSaveOptions).then((documentSaveResult: Array<string>) => {

      console.info('DocumentViewPicker.save successfully, documentSaveResult uri: ' + JSON.stringify(documentSaveResult));

    }).catch((err: BusinessError) => {

      console.error('DocumentViewPicker.save failed with err: ' + JSON.stringify(err));

    });

  } catch (error) {

    let err: BusinessError = error as BusinessError;

    console.error('DocumentViewPicker failed with err: ' + JSON.stringify(err));

  }

}

async function example07() {

  try {

    let documentSelectOptions = new picker.DocumentSelectOptions();

    let documentPicker = new picker.DocumentViewPicker();

    documentPicker.select(documentSelectOptions).then((documentSelectResult: Array<string>) => {

      console.info('DocumentViewPicker.select successfully, documentSelectResult uri: ' + JSON.stringify(documentSelectResult));

    }).catch((err: BusinessError) => {

      console.error('DocumentViewPicker.select failed with err: ' + JSON.stringify(err));

    });

  } catch (error) {

    let err: BusinessError = error as BusinessError;

    console.error('DocumentViewPicker failed with err: ' + JSON.stringify(err));

  }

}

[@Entry](/user/Entry)

[@Component](/user/Component)

struct DocumentViewPickerPage {

  [@State](/user/State) message: string = 'Hello World';

  build() {

    Column() {

      Text(this.message)

        .id('HelloWorld')

        .fontSize(50)

        .fontWeight(FontWeight.Bold)

        .alignRules({

          center: { anchor: '__container__', align: VerticalAlign.Center },

          middle: { anchor: '__container__', align: HorizontalAlign.Center }

        })

      Button() {

        Text('Save')

      }

      .type(ButtonType.Capsule)

      .height(40)

      .width(200)

      .margin({top: 20})

      .onClick(() => {

        example10()

      })

      Button() {

        Text('Select')

      }

      .type(ButtonType.Capsule)

      .height(40)

      .width(200)

      .margin({top: 20})

      .onClick(() => {

        example07()

      })

    }

    .height('100%')

    .width('100%')

    .justifyContent(FlexAlign.Center)

  }

}

详细情况和其他示例请参考文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-file-picker-V5#documentviewpicker