如何在Highcharts中停止刻度线移动轴

Question

我有类似的要求并创建了fiddle

我正在尝试使用tickPositions设置xAxis刻度，但问题是刻度线正在移出图表窗口。可以，任何人请帮助我。另外，如果我做错了，请告诉我。

$(function() {
  $(document).ready(function() {
    Highcharts.setOptions({
      global: {
        useUTC: false
      }
    });

    $('#container').highcharts({
      chart: {
        type: 'spline',
        animation: Highcharts.svg, // don't animate in old IE
        marginRight: 10,
        events: {
          load: function() {

            // set up the updating of the chart each second
            var series = this.series[0];
            var xAxis = this.xAxis[0];
            setInterval(function() {
              var x = (new Date()).getTime(), // current time
                y = Math.random();
              series.addPoint([x, y], true, true);
              xAxis.options.tickPositions.push(x);
            }, 1000);
          }
        }
      },
      title: {
        text: 'Live random data'
      },
      xAxis: {
        type: 'datetime',
        tickPositions: [],
        labels: {
          formatter: function() {
            return Highcharts.dateFormat('%H:%M:%S', this.value);
          }
        },
      },
      yAxis: {
        title: {
          text: 'Value'
        },
        plotLines: [{
          value: 0,
          width: 1,
          color: '#808080'
        }]
      },
      tooltip: {
        formatter: function() {
          return '<b>' + this.series.name + '</b><br/>' +
            Highcharts.dateFormat('%Y-%m-%d %H:%M:%S', this.x) + '<br/>' +
            Highcharts.numberFormat(this.y, 2);
        }
      },
      legend: {
        enabled: false
      },
      exporting: {
        enabled: false
      },
      series: [{
        name: 'Random data',
        data: (function() {
          // generate an array of random data
          var data = [],
            time = (new Date()).getTime(),
            i;

          for (i = -10; i <= 0; i += 1) {
            data.push({
              x: time + i * 1000,
              y: Math.random()
            });
          }
          return data;
        }())
      }]
    });
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="http://code.highcharts.com/highcharts.js"></script>
<script src="http://code.highcharts.com/modules/exporting.js"></script>

<div id="container" style="min-width: 310px; height: 400px; margin: 0 auto"></div>