vue-cli watch监听props

vue data方法如何获取父组件传过来的props？

export default {
    name: 'child',
    data() {
        return {
            getData: null
        }
    },
    props: ['data'],
    watch: {
       data(newV,oldV) {
         // do something
         console.log(newV)
         this.getData = newV
       } 
    },
}