echarts 动态过渡

<template>
  <div>
    <div ref="main" style="width: 600px; height: 400px"></div>
  </div>
</template>

<script>
import * as echarts from "echarts";

export default {
  data() {
    return {
      myChart: null,
      data: [],
      intervalId: null,
    };
  },
  mounted() {
    this.initChart();
  },
  beforeDestroy() {
    // 清除定时器
    if (this.intervalId) {
      clearInterval(this.intervalId);
      this.intervalId = null;
    }
    // 销毁echarts实例
    if (this.myChart) {
      this.myChart.dispose();
      this.myChart = null;
    }
  },
  methods: {
    initChart() {
      this.myChart = echarts.init(this.$refs.main);
      var currentIndex = -1;
      var data = [];
      for (var i = 0; i < 100; i++) {
        data.push([i, 5]);
      }

      let option = {
        xAxis: {
          type: "value",
          min: 0,
          max: 100,
        },
        yAxis: {
          type: "value",
        },
        series: [
          {
            type: "line",
            data: data,
            showSymbol: false,
            symbolSize: 0,
            lineStyle: {
              opacity: 0,
            },
            markPoint: {
              itemStyle: {
                color: "red",
              },
              symbolSize: 10,
              data: [
                {
                  coord: data[0],
                },
              ],
            },
          },
        ],
      };

      this.myChart.setOption(option);

      // 更新标记点函数使用箭头函数以保持正确的this引用
      const updateMarkPoint = () => {
        currentIndex = (currentIndex + 1) % data.length;
        this.myChart.setOption({
          series: [
            {
              markPoint: {
                data: [
                  {
                    coord: data[currentIndex],
                  },
                ],
              },
            },
          ],
        });
      };

      // 存储定时器ID以便清除
      this.intervalId = setInterval(updateMarkPoint, 100);
    },
  },
};
</script>