详解Vue 单文件组件的三种写法

export defaul { data, methods, ...}

@Component
export default class Cpn extends Vue{
 counter = 0 //data
 add(){ //methods
  this.counter += 1
 }
}

@Component
export default class Cpn extends Vue{
 @Prop(Number) sum : number | undefined; 
 counter = 0; //data
 add(){ //methods
  this.counter += 1
 }
}