vue 滚动公告

html: 

　　

<div class="marquee">
            <div class="marquee_title">
                <span>最新战报</span>
            </div>
            <div class="marquee_box">
                <ul class="marquee_list" :class="{marquee_top:animate}">
                    <li v-for="(item, index) in marqueeList">
                        <span>{{item.name}}</span>
                        <span>在</span>
                        <span class="red"> {{item.city}}</span>
                        <span>杀敌</span>
                        <span class="red"> {{item.amount}}</span>
                        <span>万</span>
                    </li>
                </ul>
            </div>
        </div>

.marquee {
             100%;
            height: 50px;
            align-items: center;
            color: #3A3A3A;
            background-color: #b3effe;
            display: flex;
            box-sizing: border-box;
        }

        .marquee_title {
            padding: 0 20px;
            height: 30px;
            font-size: 14px;
            border-right: 1px solid #d8d8d8;
            align-items: center;
        }

        .marquee_box {
            display: block;
            position: relative;
             60%;
            height: 30px;
            overflow: hidden;
        }

        .marquee_list {
            display: block;
            position: absolute;
            top: 0;
            left: 0;
        }

        .marquee_top {
            transition: all 0.5s;
            margin-top: -30px
        }

        .marquee_list li {
            height: 30px;
            line-height: 30px;
            font-size: 14px;
            padding-left: 20px;
        }

        .marquee_list li span {
            padding: 0 2px;
        }

        .red {
            color: #FF0101;
        }
        ul, li {
            margin: 0;
            padding: 0;
            display: flex;
            box-sizing: border-box;
        }

js:

data: marqueeList: [{
                    name: '最新',
                    city: '消息',
                    amount: '40'
                }],


created: setInterval(function(){
                _this.showMarquee({
                    name: '4军',
                    city: '重庆',
                    amount: '40'
                })
            }, 2000)

methods: showMarquee: function (item) {
                var _this = this;
                _this.marqueeList.push (item);
                setTimeout (() => {
                    _this.animate = true;
                    setTimeout(function(){
                        _this.marqueeList.shift ();
                        _this.animate = false;
                    },500)
                }, 500);
            },