五笔打字通主页
真机,模拟器,预览器,测试下面的代码。 川石,asrkts,鸿蒙
import { BusinessError } from '@kit.BasicServicesKit' import { preferences } from '@kit.ArkData' //导入首选项模块 @Entry @Component struct Page8 { dataPreferences: preferences.Preferences | null = null //Preferences实例-wb98.com @State fontSize: number = 25 aboutToAppear(): void { let options: preferences.Options = { name: 'myStore' } //仓库名:myStore this.dataPreferences = preferences.getPreferencesSync(getContext(this), options) //获取Preferences实例 } build() { Column({ space: 10 }) { Text("今天天气不错") .fontSize(this.fontSize) .margin({ bottom: 180 }) Button('存值') .width('100%') .onClick(async () => { // this.dataPreferences?.put('fontSize', 45) this.dataPreferences?.put('fontSize', 45, (err: BusinessError) => { if (err) { console.error(`写入数据失败:code=${err.code},message=${err.message}`) return } console.log('写入数据成功') }) }) Button('永存') .width('100%') .backgroundColor(Color.Orange) .onClick(async () => { // this.dataPreferences?.flush() this.dataPreferences?.flush((err: BusinessError) => { if (err) { console.log(`存入数据失败:code=${err.code},message:${err.message}}`) return } console.log('存入数据成功') }) }) Button("取值") .width('100%') .onClick(() => { // this.dataPreferences?.get('fontSize', 25) this.dataPreferences?.get('fontSize', 25, (err: BusinessError, val:preferences.ValueType) => { if (err) { console.error(`获取数据失败:code=${err.code},message=${err.message}`) return } this.fontSize = parseInt(val.toString()); console.log(`获取数据成功:val = ${val}`) }) }) Button('删值') .width('100%') .onClick(() => { // this.dataPreferences?.delete('fontSize') this.dataPreferences?.delete('fontSize', (err: BusinessError) => { if (err) { console.error(`删除失败: code = ${err.code},message =${err.message}`) return } console.log('删除成功') }) }) } .padding(10) .width('100%') .height('100%') .justifyContent(FlexAlign.Center) .alignItems(HorizontalAlign.Center) } }
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