详解vue 自定义marquee无缝滚动组件

<template>
 <div>
  <marqueeLeft :send-val='send'></marqueeLeft >
 </div>
</template>
<script>
 import marqueeLeft from '../components/marquee'
 export default {
  data:function(){
   return{
    send:[{place: "来自东莞市的", name: "黄女士"},
   {place: "来自太原市的", name: "吴先生"},
   {place: "来自常州市的", name: "戚先生"},
   {place: "来自金华市的", name: "尤先生"},
   {place: "来自贵阳市的", name: "陈女士"},
   {place: "来自长春市的", name: "魏女士"},
   {place: "来自泉州市的", name: "褚先生"},
   {place: "来自南昌市的", name: "蒋女士"},
   {place: "来自南京市的", name: "沈先生"},
   {place: "来自天津市的", name: "韩先生"},
   {place: "来自宁波市的", name: "邹女士"},
   {place: "来自嘉兴市的", name: "周女士"},
   {place: "来自长沙市的", name: "秦先生"},
   {place: "来自济南市的", name: "孙女士"},
   {place: "来自杭州市的", name: "杨先生"}]
   }
  },
  components:{ marqueeLeft },
 }
</script>

<template>
 <div class="my-outbox">
  <div class="my-inbox" ref='box'>
   <div class="my-list" v-for="(item,index) in sendVal" :key='index' ref='list'>
    {{item.place}}<span class="my-uname">{{item.name}}</span>刚刚购买了产品
   </div>
  </div>
 </div>
</template>

<script>
 export default {
  name:'my-marquee-left',
  props:{  
   sendVal:Array
  },
  data() {
   return {
    nowTime:null,//定时器标识
    disArr:[],//每一个内容的宽度
   }
  }, 
  mounted:function(){
   var that = this;
   var item = this.$refs.list; 
   var len = this.sendVal.length;
   var arr = [];
   var margin = this.getMargin(item[0]) //因为设置的margin值一样，所以取第一个就行。
   for(var i = 0;i < len;i++){
    arr.push(item[i].clientWidth + margin)//把宽度和 margin 加起来就是每一个元素需要移动的距离
   }
   this.disArr = arr;
   this.moveLeft();
  },
  beforeDestroy:function(){
   clearInterval(this.nowTime);//页面关闭清除定时器
   this.nowTime = null;//清除定时器标识
  },
  methods:{
   //获取margin属性
   getMargin:function(obj){
    var marg = window.getComputedStyle(obj,null)['margin-right'];
    marg = marg.replace('px','')
    return Number(marg) //强制转化成数字
   },
   //移动的方法
   moveLeft:function(){
    var outbox = this.$refs.box;
    var that=this;
    var startDis = 0;//初始位置
    this.nowTime = setInterval(function(){
     startDis -= 0.5;
     if(Math.abs(startDis) > Math.abs(that.disArr[0])){
      that.disArr.push(that.disArr.shift())//每次移动完一个元素的距离，就把这个元素的宽度
      that.sendVal.push(that.sendVal.shift())//每次移动完一个元素的距离，就把列表数据的第一项放到最后一项
      startDis = 0;
     }
     outbox.style = 'transform: translateX('+ startDis +'px)'; //每次都让盒子移动指定的距离
    },1000/60)
   }
  }
 }
</script>

<style lang="less" scoped>
 .my-outbox{
  color: #D7BC8D;
  overflow: hidden;
  height: 35px;
  background: #422b02;
  .my-inbox{
   white-space: nowrap;
   .my-list{
    margin-right: 25px;
    display: inline-block;
    font-size: 13px;
    height: 35px;
    line-height: 35px;
    .my-uname{
     color: #FF8900;
    }
   }
  }
 }
</style>