svg时间轴每隔30秒向前移动

如何每过30秒，时间轴向前移动一点

http://code.google.com/p/chromium/issues/detail?id=166164

 <svg style="width: 100%">
      <g
        id="timeScale"
        transform="translate(0,28)"
        fill="none"
        font-size="10"
        font-family="sans-serif"
        text-anchor="middle"
      >
        <path class="domain" stroke="currentColor" d="M10.5,0.5H1890.5"></path>
        <g class="tick" :class="{major: index%12==0}" opacity="1" :transform="`translate(${(1880 / 144)*index +20 },0)`" v-for="(item,index) in 144" :key="index">
          <line stroke="currentColor" :y2="index%12==0?9:6"></line>
          <text fill="#000" y="14" dy="0.71em" v-if="index%12==0">22:35</text>
        </g>
      </g>
    </svg>

<div id="app" style="max-width:680px;margin:0 auto">
    <template>
        <div>
            <svg style="width: 100%">
                <g id="timeScale"
                   :transform="`translate(${-translatex},28)`"
                   fill="none"
                   font-size="10"
                   font-family="sans-serif"
                   text-anchor="middle">
                    <path class="domain" stroke="currentColor" :d="`M10.5,0.5H${4890.5+moveWidth}`"></path>
                    <g class="tick"
                       :class="{ major: index % 12 == 0 }"
                       opacity="1"
                       :transform="`translate(${(1880 / count) * index + 20},0)`"
                       v-for="(item, index) in timeList"
                       :key="index"
                       ref="time">
                        <line stroke="currentColor" :y2="showText(index)? 9 : 6"></line>
                        <text fill="#000" y="14" dy="0.71em" v-if="showText(index)">
                            {{ item }}
                        </text>
                    </g>
                </g>
            </svg>
        </div>
    </template>

</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script src="http://cdn.staticfile.org/moment.js/2.24.0/moment.js"></script>
<script>
    var vue = new Vue({
        el: '#app',
        data: {
            timeList: [],
            tick: 0,
            moveWidth:0,
            translatex: 0,
            count:144
        },
        created() {
            this.moveWidth = 1880 / this.count;
            this.createData();
        },
        methods: {
            showText(index) {
                if (index >= this.tick && (index == this.tick//第一条刻度判断
                    ||
                    (
                    index - this.tick > 2//第一条刻度和下一条刻度需要大于2，下一条刻度在显示文字和长度为9的刻度线，防止文字重叠
                    && index % 12 == 0)
                )
                ) return true;
                return false
            },
            animate() {
                var timer = setInterval(() => {
                    this.translatex += 1;
                    if (this.translatex >= this.moveWidth) {
                        this.translatex = this.moveWidth;
                        clearInterval(timer);

                        this.tick++;

                        //重新获取数据
                        this.createData();

                    }
                }, 50)
            },
            createData() {
                this.timeList.splice(0, this.timeList.length)
                let endDate = new Date();
                let splitTime = 5 * 60 * 1000;
                let count = this.count + this.tick;
                //转为时间戳
                let endTime = endDate.getTime();
                let mod = endTime % splitTime;

                if (mod > 0) {
                    endTime = endTime - mod;
                }
                endTime += this.tick * splitTime;
                while (count-- > 0) {
                    let d = new Date();
                    d.setTime(endTime - count * splitTime);
                    this.timeList.push(moment(d).format("HH:mm"));
                }
                this.moveWidth += 1880 / this.count
   
                setTimeout(() => {
                    this.animate();
                }, 1000);//移动坐标轴，这里改为30s获取一次数据，测试1s一次
            }
        }
    })
</script>

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