如何在Vue项目中应用TypeScript类

import {Component,Vue} from 'vue-property-decorator'; 
import {componentA,componentB} from '@/components'; 
 
 @Component({ 
    components:{ 
        componentA, 
        componentB, 
    }, 
    directives: { 
        focus: { 
            // 指令的定义 
            inserted: function (el) { 
                el.focus() 
            } 
        } 
    } 
}) 
export default class YourCompoent extends Vue{ 
    
} 

@Component 
export default class HelloDecorator extends Vue { 
    count: number = 123 // 类属性相当于以前的 data 
 
    add(): number { // 类方法就是以前的方法 
        this.count + 1 
    } 
 
    // 获取计算属性 
    get total(): number { 
      return this.count + 1 
    } 
 
    // 设置计算属性 
    set total(param:number): void { 
      this.count = param 
    } 
} 

import {Component,Vue,Prop} from vue-property-decorator; 
 
@Component 
export default class YourComponent extends Vue { 
    @Prop(String) 
    propA:string; 
     
    @Prop([String,Number]) 
    propB:string|number; 
     
    @Prop({ 
     type: String, // type: [String , Number] 
     default: 'default value', // 一般为String或Number 
      //如果是对象或数组的话。默认值从一个工厂函数中返回 
      // defatult: () => { 
      //     return ['a','b'] 
      // } 
     required: true, 
     validator: (value) => { 
        return [ 
          'InProcess', 
          'Settled' 
        ].indexOf(value) !== -1 
     } 
    }) 
    propC:string; 
} 

import { Vue, Component, Watch } from 'vue-property-decorator' 
 
@Component 
export default class YourComponent extends Vue { 
  @Watch('child') 
  onChildChanged(val: string, oldVal: string) {} 
 
  @Watch('person', { immediate: true, deep: true }) 
  onPersonChanged1(val: Person, oldVal: Person) {} 
 
  @Watch('person') 
  onPersonChanged2(val: Person, oldVal: Person) {} 
} 

import {Vue, Component, Emit} from 'vue-property-decorator'; 
    @Component({}) 
    export default class Some extends Vue{ 
        mounted(){ 
            this.$on('emit-todo', function(n) { 
                console.log(n) 
            }) 
            this.emitTodo('world'); 
        } 
        @Emit() 
        emitTodo(n: string){ 
            console.log('hello'); 
        } 
    }