如何查询设备类型？有人知道吗？

import deviceInfo from'@ohos.deviceInfo'

@Entry
@Component
struct GetDeviceTypeSample {
@State deviceType:string='unknown'

aboutToAppear() {
this.deviceType= deviceInfo.deviceType
}

build() {
Column() {
Text(this.deviceType).fontSize(24)
}
.width('100%')
.height('100%')
}
}