HarmonyOS鸿蒙Next中为何轻量级智能穿戴开发-接口-文件数据操作失败？

HarmonyOS鸿蒙Next中为何轻量级智能穿戴开发-接口-文件数据操作失败？ 出错项目描述：鸿蒙学习笔记 - 基于轻量级智能穿戴开发 TODO 应用

出错项目地址：https://github.com/bingoogolapple/HarmonyOS-Note

问题以及日志：file.writeText、file.readText、storage.set、storage.get 全都执行失败，是【轻量级智能穿戴开发】本来就不支持文件数据操作？还是我代码写法有问题？

import storage from '@system.storage'
import file from '@system.file'

export default {
    data:{},
    testWriteText() {
        file.writeText({
            uri: 'internal://app/workspace/test.txt',
            text: 'Text that just for test.',
            success: function () {
                console.log('call writeText success.')
            },
            fail: function (data, code) {
                console.error('call fail callback fail, code: ' + code + ', data: ' + data)
            }
        })
    },
    testReadText() {
        file.readText({
            uri: 'internal://cache/workspace/text.txt',
            success: function (data) {
                console.log('call readText success: ' + data.text)
            },
            fail: function (data, code) {
                console.error('call fail callback fail, code: ' + code + ', data: ' + data)
            }
        })
    },
    testSetStorage() {
        storage.set({
            key: 'storage_key',
            value: 'storage value',
            success: function () {
                console.log('call storage.set success.')
            },
            fail: function (data, code) {
                console.log('call storage.set fail, code: ' + code + ', data: ' + data)
            }
        })
    },
    testGetStorage() {
        storage.get({
            key: 'storage_key',
            success: function (data) {
                console.log('call storage.get success: ' + data)
            },
            fail: function (data, code) {
                console.log('call storage.get fail, code: ' + code + ', data: ' + data)
            },
            complete: function () {
                console.log('call complete')
            }
        })
    }
}