未验证 提交 b3388da7 编写于 作者: 葛亚芳 提交者: Gitee

update zh-cn/application-dev/database/database-preference-guidelines.md.

Signed-off-by: N葛亚芳 <geyafang@huawei.com>
上级 23ea35ae
无相关合并请求
......@@ -94,7 +94,7 @@
```js
// 获取context
import featureAbility from '@ohos.ability.featureAbility'
var context = featureAbility.getContext()
let context = featureAbility.getContext()
let promise = data_preferences.getPreferences(context, 'mystore');
```
......@@ -104,8 +104,8 @@
```ts
// 获取context
import Ability from '@ohos.application.Ability'
var context
class MainAbility extends Ability{
let context = null
export default class MainAbility extends Ability {
onWindowStageCreate(windowStage){
context = this.context
}
......@@ -161,11 +161,12 @@
应用订阅数据变更需要指定observer作为回调方法。订阅的Key的值发生变更后,当执行flush方法时,observer被触发回调。
```js
var observer = function (key) {
let observer = function (key) {
console.info("The key" + key + " changed.");
}
preferences.on('change', observer);
preferences.put('startup', 'auto', function (err) {
// 数据产生变更,由'auto'变为'manual'。
preferences.put('startup', 'manual', function (err) {
if (err) {
console.info("Failed to put the value of 'startup'. Cause: " + err);
return;
......
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