<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/highcharts@6/highcharts.js"></script>
<!-- vue-highcharts should be load after Highcharts -->
<script src="https://cdn.jsdelivr.net/npm/vue-highcharts@0.1/dist/vue-highcharts.min.js"></script>

<div id="app">
  <highcharts :options="options" ref="highcharts"></highcharts>
  <button @click="updateCredits">update credits</button>
</div>

var options = {
  title: {
    text: 'Monthly Average Temperature',
    x: -20 //center
  },
  subtitle: {
    text: 'Source: WorldClimate.com',
    x: -20
  },
  xAxis: {
    categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
      'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'
    ]
  },
  yAxis: {
    title: {
      text: 'Temperature (°C)'
    },
    plotLines: [{
      value: 0,
      width: 1,
      color: '#808080'
    }]
  },
  tooltip: {
    valueSuffix: '°C'
  },
  legend: {
    layout: 'vertical',
    align: 'right',
    verticalAlign: 'middle',
    borderWidth: 0
  },
  series: [{
    name: 'Tokyo',
    data: [7.0, 6.9, 9.5, 14.5, 18.2, 21.5, 25.2, 26.5, 23.3, 18.3, 13.9, 9.6]
  }, {
    name: 'New York',
    data: [-0.2, 0.8, 5.7, 11.3, 17.0, 22.0, 24.8, 24.1, 20.1, 14.1, 8.6, 2.5]
  }, {
    name: 'Berlin',
    data: [-0.9, 0.6, 3.5, 8.4, 13.5, 17.0, 18.6, 17.9, 14.3, 9.0, 3.9, 1.0]
  }, {
    name: 'London',
    data: [3.9, 4.2, 5.7, 8.5, 11.9, 15.2, 17.0, 16.6, 14.2, 10.3, 6.6, 4.8]
  }]
};

var vm = new Vue({
  el: '#app',
  data: {
    options: options
  },
  methods: {
  	updateCredits: function() {
    	var chart = this.$refs.highcharts.chart;
      chart.credits.update({
        style: {
          color: '#' + (Math.random() * 0xffffff | 0).toString(16)
        }
      });
    }
  }
});