vue中使用chart.js，有一个tab栏动态切换不同的折线图，当鼠标在图表上滑动会切换到之前的图表，是怎么回事

Question

drawLine () {
  let wrapper = null
  if (this.tabindex == 1) {
    wrapper = document.querySelector("#signChart1").getContext("2d");
  } else if (this.tabindex == 2) {
    wrapper = document.querySelector("#signChart2").getContext("2d");
  } else if (this.tabindex == 3) {
    wrapper = document.querySelector("#signChart3").getContext("2d");
  } else {
    wrapper = document.querySelector("#signChart4").getContext("2d");
  }
  console.log(wrapper)
  let options = {
    type: "line",
    data: {
      labels: this.chart.labels,
      datasets: this.chart.data
    },
    options: {
      scales: {
        yAxes: [
          {
            ticks: this.chart.ticks
          }
        ]
      }
    }
  };
  this.chartLine = new Chart(wrapper, options);
  this.chartLine.update();
},