首选项报错："Using this inside stand-alone functions is notsupported"如何解决

import dataPreferences from '@ohos.data.preferences'; 
 
let context = getContext(this) 
let options: dataPreferences.Options = { name: 'myStore', dataGroupId: 'myId' }; 
 
async function getPreferences() { 
  return dataPreferences.getPreferences(context, options) 
}