1、ColumnList组件的编写

UI

一、components/ColumnList.vue

<template>
    <ul>
        <li v-for="column of list" :key="column.id">
            <img :src="column.avatar" :alt="column.title">
            <h5>{{column.title}}</h5>
            <p>{{column.description}}</p>
            <a href="#">进入专栏</a>
        </li>
    </ul>
</template>
<script lang="ts">
import { defineComponent, PropType } from 'vue'
export interface ColumnProps{
    id:number,
    title:string,
    avatar:string,
    description:string
}
export default defineComponent({
    name:'ColumnList',
    props:{
        list:{
            type:Array as PropType<ColumnProps[]>,
            required:true
        }
    },
    setup(props){
        console.log(props)
    }
})
</script>

二、App.vue中使用这个组件

<template>
  <column-list :list='list'></column-list>
</template>
<script lang='ts'>
import { defineComponent } from 'vue'
import 'bootstrap/dist/css/bootstrap.min.css'
import ColumnList, { ColumnProps } from './components/ColumnList.vue'
const testData:ColumnProps[] = [
  {
    id:1001,
    title:'vue3.x',
    avatar:'https://images.dog.ceo/breeds/schipperke/n02104365_9354.jpg',
    description: '这是一只野狗',
  },
];
export default defineComponent({
  name: 'App',
  components: {
    ColumnList,
  },
  setup(){
    return {
      list:testData
    }
  }
})
</script>

三、ColumnList设置可选参数avatar,及计算属性

<template>
  <div class="row">
    <div class="col-4 " v-for="column of columnList" :key="column.id">
      <div class="card h-100 shadow-sm text-center">
        <img class="card-img-top rounded" :src="column.avatar" :alt="column.title" />
        <div class="card-body">
          <h5 class="card-title">{{ column.title }}</h5>
          <p class="card-text">{{ column.description }}</p>
          <a href="#" class="btn btn-primary border">进入专栏</a>
        </div>
      </div>
    </div>
  </div>
</template>
<script lang="ts">
import { computed, defineComponent, PropType } from "vue";
import "bootstrap/dist/css/bootstrap.min.css";
export interface ColumnProps {
  id: number;
  title: string;
  avatar?: string;
  description: string;
}
export default defineComponent({
  name: "ColumnList",
  props: {
    list: {
      type: Array as PropType<ColumnProps[]>,
      required: true,
    },
  },
  setup(props) {
    const columnList = computed(()=>{
        return props.list.map(item=>{
            if(!item.avatar){
                item.avatar = require('@/assets/logo.png')
            }
            return item;
        })
    })
    return {
        columnList
    }
  },
});
</script>