Simple use of typescript's class interface

1、 Interface inheritance extends

2、 Class is used in conjunction with interfaces implements

interface Radio{
    switchRadio(trigger:boolean):void
}
interface Battery{
    checkBatteryStatus():void
}
// Interface inheritance extends
interface RadioWithBattery extends Radio{
    checkBatteryStatus():void
}
// Interface join class implements
class Cellphone implements Radio{
    switchRadio(trigger:boolean){}
}
// Interface join class implements
class Cellphone2 implements RadioWithBattery{
    switchRadio(trigger:boolean){}
    checkBatteryStatus(){}
}