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>