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

Signed-off-by: N @ge-yafang <geyafang@huawei.com>

update zh-cn/application-dev/database/database-preference-guidelines.md.
Signed-off-by: N @ge-yafang <geyafang@huawei.com>
7d36762f · 葛亚芳 · Gitee · 939bb9d7 · 7d36762f
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zh-cn/application-dev/database/database-preference-guidelines.md ...pplication-dev/database/database-preference-guidelines.md +1 -1

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--- a/zh-cn/application-dev/database/database-preference-guidelines.md
+++ b/zh-cn/application-dev/database/database-preference-guidelines.md
@@ -139,7 +139,7 @@

   ```js
    var observer = function (key) {
-        console.info("The key of " + key + " changed.");
+        console.info("The key" + key + " changed.");
    }
    preferences.on('change', observer);
    preferences.put('startup', 'auto', function (err) {