Vue 列表：隔行变色+无缝滚动_vue隔行换色

1.列表效果：

数据定时刷新+无缝滚动+隔行变色+数据大于5条才执行滚动

2.注意

注意：报错（变量未定义）

原因：数据未加载好就去渲染页面了

方法：获取到数据之后再去渲染页面（执行滚动）

3.vue

<template>
  <div id="com" v-if="listdata">
    <ul :class="animate?'list':''">
      <li
        v-for="(item,index) in listdata"
        :key="index"
        :class="(index%2==0&&!changecolor||index%2!==0&&changecolor)?'bg_color':'bg_color2'"
      >{{ item.content }}</li>
    </ul>
  </div>
</template>

<script>
export default {
  name: "scroll3",
  data() {
    return {
      listdata: [
        // {content: 'css无缝滚动0'},
        // {content: 'css无缝滚动1'},
        // {content: 'css无缝滚动2'},
        // {content: 'css无缝滚动3'},
        // {content: 'css无缝滚动4'},
        // {content: 'css无缝滚动5'},
        // {content: 'css无缝滚动6'},
        // {content: 'css无缝滚动7'},
        // {content: 'css无缝滚动8'},
        // {content: 'css无缝滚动9'},
      ],
      animate: false, //控制动画
      changecolor: false, //控制背景颜色
      timer1: null,
      timer2: null,
      timer: null
    };
  },
  created() {
    this.getData();
  },
  mounted() {
    clearInterval(this.timer);
    //定时刷新数据
    this.timer = setInterval(() => {
      this.getData();
    }, 60000);
  },
  destroyed() {
    clearInterval(this.timer1);
    clearInterval(this.timer2);
    clearInterval(this.timer);
  },
  methods: {
    scroll() {
      clearInterval(this.timer2);
      this.animate = true; //开启动画
      this.timer2 = setTimeout(() => {
        //延时--5ms仅执行一次
        this.animate = false; //关闭动画
        this.changecolor = !this.changecolor; //颜色隔行变色
        this.listdata.push(this.listdata[0]);
        this.listdata.shift();
      }, 500);
    },
    getData() {
      // 获取数据
      this.listdata = [
        { content: "css无缝滚动0" },
        { content: "css无缝滚动1" },
        { content: "css无缝滚动2" },
        { content: "css无缝滚动3" },
        { content: "css无缝滚动4" },
        { content: "css无缝滚动5" },
        { content: "css无缝滚动6" },
        { content: "css无缝滚动7" },
        { content: "css无缝滚动8" },
        { content: "css无缝滚动9" }
      ];
      clearInterval(this.timer1);
      //定时--3S定时轮询（执行多次）
      if (this.listdata.length > 5) {
        //数据多于5条执行无缝滚动
        this.timer1 = setInterval(this.scroll, 3000); //获取到数据之后再执行滚动效果，可以避免数据未加载好就去渲染页面，会报错（变量未定义）
      }
    }
  }
};
</script>

<style lang="scss" scoped>
#com {
  display: block;
  width: 500px;
  height: 300px;
  overflow-y: auto;
  margin: 0;
  padding: 0;
 
  .list {
    margin-top: -45px;
    transition: all 0.5s;
  }
 
  ul {
    margin: 0;
    padding: 0;
    list-style-type: none;
 
    li {
      margin: 0;
      padding: 0;
      height: 40px;
      line-height: 40px;
    }
  }
}
 
.bg_color {
  background-color: #b3eed4 !important;
}
 
.bg_color2 {
  background-color: #ffffff !important;
}
 
</style>