<template>  <div ref="root">     <div class="sliderPanel">    <div v-for="(item,index) in imgArray" class="verticalCenter picbox">     <transition name="slide-fade">       <img :style="{width:width,top:top}" @mouseover="clearAuto" @mouseout="slideAuto" v-show="index===selectIndex" :src="item.url" style="min-height: 100%">     </transition>    </div>   </div>   <div @click="clickLeft" @mouseover="clearAuto" @mouseout="slideAuto" class="arrowLeft verticalCenter horizaCenter">      左移   </div>   <div @click="clickRight" @mouseover="clearAuto" @mouseout="slideAuto" class="arrowRight verticalCenter horizaCenter">     右移   </div>   <div class="sliderBar horizaCenter">    <div v-for="(item,index) in imgArray" @mouseover="clearAuto" @mouseout="slideAuto" @click="setIndex(index)" class="circle" :class="{circleSelected:index===selectIndex}">    </div>   </div>  </div> </template> <script>  const SCREEN_WIDTH=document.body.clientWidth//網頁可見區域寬  const SCREEN_HEIGHT=document.body.scrollHeight//網頁正文全文高  var selectIndex=0  var timer=null  export default {   name: "ErCarousel",   data() {     return {          selectIndex:0,           width:'100%',       height:SCREEN_HEIGHT+'px',       top:0,       imgArray:[        {         url:'/src/components/carousel/image/1.jpg',        },        {         url:'/src/components/carousel/image/2.jpg',        },        {         url:'/src/components/carousel/image/3.jpg',        }       ]     }   },   methods:{      slideAuto:function () {       var that=this;     timer=setInterval(function(){        that.clickRight();       },3000)     //clearInterval(timer);    },    clearAuto:function(){     clearInterval(timer);    },      clickLeft:function(){       if(this.selectIndex==0){         this.selectIndex=this.imgArray.length-1;       }else{         this.selectIndex--;       }       console.log(this.selectIndex);          },    clickRight:function(){     if(this.selectIndex==this.imgArray.length-1){         this.selectIndex=0;       }else{         this.selectIndex++;       }    },    setIndex:function (index) {     this.selectIndex=index;    }   },   mounted:function(){   this.slideAuto();     } }  </script> <style>