vue3.0封装轮播图组件的步骤

目录

• 一：封装思想
• 二：封装流程
• 三： 圆点指示器
• 四： 左右指示器
• 五：最后：
• 六：往期回顾

import Carousel from './Carousel/carousel';
import CarItem from './Carousel/item';let SqmUI = {};
SqmUI.install = function(vue) {
 vue.component(Carousel.name, Carousel);
 vue.component(CarItem.name,CarItem);
};
export default SqmUI;

declare const _default: ({
 install: (app: import("vue").App<any>, ...options: any[]) => any; // 这里单纯描述一下install});
export default _default;

import SqmUI from '@/libs/sqm_ui/index';
import { createApp } from 'vue';
createApp.use(SqmUI);

<template>
 <div class="carousel">
 <slot></slot> // 这里的slot是用来放置item组件
 </div>
</template>

<template>
 <div class="carousel-item">
 <slot></slot> // 这里的slot是用来放置img
 </div>
</template>

<carousel
 :autoPlay="true" 
 :durdation="3000" 
 :initial="3" 
 :hasDot="true" 
 :hasDirector="true"> </carousel>

props: { 
 autoplay: {  
 type: Boolean,  
 default: true }, 
 duration: {  
 type: Number,  
 default: 3000 }, 
 initial: {  
 type: Number,  
 default: 0 }, 
 hasDot: {  
 type: Boolean,
 default: true }, 
 hasDirector: { 
 type: Boolean,  
 default: true }
}

const autoPlay = () => {
 if (props.autoplay) {
 t = setInterval(() => {
  // 轮播逻辑
 }, props.duration);
};
onMounted(() => {
 autoPlay();
});

<div class="carsel-item" v-if="selfIndex === currentIndex"> 
 <slot></slot> 
</div>

setup() {
 const instance:any = getCurrentInstance(); console.log(instance);
}

setup(props) { 
 const state = reactive({  
 currentIndex: props.initial,  
 itemLen: 0,  
 showDir: false 
 });
}

const setIndex = ((dir:String): void => { 
 switch(dir) { 
 case 'next':  
  state.currentIndex += 1;  
  if (state.currentIndex === state.itemLen) {   
  state.currentIndex = 0;  
  }  
  break; 
 case 'prev':  
  state.currentIndex -= 1;  
  if (state.currentIndex === -1) {   
  state.currentIndex = state.itemLen - 1;  
  }  
  break; 
 default:  
  break; 
 } 
});

watch(() => {  
 return instance.parent.ctx.currentIndex 
 }, (value) => {  
 state.currentIndex = value; 
})

<template>
 <div class="dot-goes-wrapper" v-if="hasDot">
 <div class="dot-item" v-for="item in itemLen" :key="item">
 <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" 
  class="dot-link"
  :style="{backgroundColor: (item - 1) === currentIndex ? dotBgColor : '#fff'}" 
  @click="dotClick(item - 1)">
 </a> 
 </div> 
 </div>
</template>
<script lang="ts">
import {defineComponent} from 'vue';
export default defineComponent({
 name: 'dot',
 props: { 
 itemLen: Number, 
 currentIndex: Number, 
 dotBgColor: {  
  type: String,
  default: '#ff5000' },
 hasDot: {  
  type: Boolean,  
  default: true } 
 }, 
 setup(props, ctx) { 
 const dotClick = (index: Number) => { 
  ctx.emit('dotClick', index); 
 }; 
 return {  
  dotClick 
 } 
}})
</script>

@dotClick="dotClick"
const dotClick = (index: any): void => {
state.currentIndex = index;
};

<template> 
 <div v-if="showDir"> 
 <div class="director dir-next" v-if="dir === 'next'">  
  <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" @click="dirClick(dir)">&gt;</a> 
 </div> 
 <div class="director dir-prev" v-else-if="dir === 'prev'">  
  <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" @click="dirClick(dir)">&lt;</a> 
 </div> 
 </div>
</template>
<script lang="ts">
import {defineComponent} from 'vue';
export default defineComponent({ 
 name: 'direct', 
 props: { 
 dir: String, 
 showDir: {  
  type: Boolean,  
  default: false 
 } 
 }, 
 setup(props, ctx) { 
 const dirClick = (dir: String) => {  
  ctx.emit('dirClick', dir); 
 }; 
 return {  
  dirClick 
 } 
 }
})</script>

onBeforeUnmount(() => {
      _clearFunction();
});
function _clearFunction(): void {
     clearInterval(t);
       t= null;
};

const mouseEnter = (): void => { 
 _clearFunction();
 state.showDir = true;
 }; 

 const mouseLeave = (): void => { 
  autoPlay();
  state.showDir = false; 
};