VUE3之Component（一）

一个案例

// App.vue
<template>
    <div>
        <tab-control :titles="titles"
            @titleClick="titleClick"></tab-control>
        <h2>{{contents[currentIndex]}}</h2>
    </div>
</template>

<script>
import TabControl from "./TabControl.vue";
    export default {
        components:{
            TabControl
        },
        data(){
            return {
                titles: ["衣服","鞋子","裤子"],
                contents: ["衣服页面","鞋子页面","裤子页面"],
                currentIndex:0
            }
        },
        methods: {
            titleClick(index){
                this.currentIndex=index;
            }
        },
    }
</script>

<style scoped>

</style>

// TabControl.vue
<template>
    <div class="tab-control">
        <div class="tab-control-item" 
            :class="{active: currentIndex === index}"
            v-for="(title, index) in titles" 
            :key="title"
            @click="itemClick(index)">
            <span>{{title}}</span>
        </div>
    </div>
</template>

<script>
    export default {
        emits:["titleClick"],
        props:{
            titles:{
                type: Array,
                default(){
                    return [];
                }
            }
            
        },
        data(){
            return {
                currentIndex:0
            }
        },
        methods: {
            itemClick(index){
                this.currentIndex=index;
                this.$emit("titleClick",index);
            }
        }
    }
</script>

<style scoped>
    .tab-control{
        display: flex;
    }
    .tab-control-item{
        flex:1;
        text-align: center;
    }
    .tab-control-item.active{
        color: red;
    }
    .tab-control-item.active span{
        border-bottom: 5px solid red;
        padding: 5px 10px;
    }
</style>

效果：