如何实现卡片定时刷新和定点刷新？

{
"forms": [
{
"name": "UpdateDuration",
"description": "$string:widget_updateduration_desc",
"src": "./ets/updateduration/pages/UpdateDurationCard.ets",
"uiSyntax": "arkts",
"window": {
"designWidth": 720,
"autoDesignWidth": true
},
"colorMode": "auto",
"isDefault": true,
"updateEnabled": true,
"scheduledUpdateTime": "10:30",
"updateDuration": 2,
"defaultDimension": "2*2",
"supportDimensions": [
"2*2"
]
}
]
}

scheduledUpdateTime​​字段中进行设置
{
"forms": [
{
"name": "ScheduledUpdateTime",
"description": "$string:widget_scheupdatetime_desc",
"src": "./ets/scheduledupdatetime/pages/ScheduledUpdateTimeCard.ets",
"uiSyntax": "arkts",
"window": {
"designWidth": 720,
"autoDesignWidth": true
},
"colorMode": "auto",
"isDefault": true,
"updateEnabled": true,
"scheduledUpdateTime": "10:30",
"updateDuration": 0,
"defaultDimension": "2*2",
"supportDimensions": [
"2*2"
]
}
]
}