Highcharts 丢失值区域图

一代码
<html>
<head>
<meta charset="UTF-8" />
<title>Highcharts 教程 | 菜鸟教程(runoob.com)</title>
<script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="http://code.highcharts.com/highcharts.js"></script>
</head>
<body>
<div id="container" style="width: 550px; height: 400px; margin: 0 auto"></div>
<script language="JavaScript">
$(document).ready(function() {
   //图表类型是区域图，
   var chart = {
      type: 'area',
      spacingBottom: 30   //表示图表间的间隔区间
   };
   // 标题
   var title = {
      text: '水果消费'
   };
   // 子标题
   var subtitle = {
      text: '* 小明的香蕉消费未知',
      floating: true,
      align: 'right',
      verticalAlign: 'bottom',
      y: 15
   };
   var legend = {
      layout: 'vertical',
      align: 'left',
      verticalAlign: 'top',
      x: 150,
      y: 100,
      floating: true,
      borderWidth: 1,
      backgroundColor: (Highcharts.theme && Highcharts.theme.legendBackgroundColor) || '#FFFFFF'
   };
   //X 轴
   var xAxis = {
      categories: ['苹果', '梨子', '橘子', '香蕉', '葡萄', '李子', '草莓', '覆盆子']
   };
   //Y 轴
   var yAxis = {
      title: {
         text: 'Y轴'
      },
      labels: {
         formatter: function () {
            return this.value;
         }
      }
   };
   //提示符
   var tooltip = {
      formatter: function () {
         return '<b>' + this.series.name + '</b><br/>' +
            this.x + ': ' + this.y;
      }
   };
   var plotOptions = {
      area: {
         fillOpacity: 0.5
      }
   };
   var credits = {
      enabled: false
   };
   // 数据
   var series= [{
        name: '小马',
            data: [0, 1, 4, 4, 5, 2, 3, 7]
        }, {
            name: '小明',
            data: [1, 0, 3, null, 3, 1, 2, 1]
      }
   ];

   var json = {};
   json.chart = chart;
   json.title = title;
   json.subtitle = subtitle;
   json.xAxis = xAxis;
   json.yAxis = yAxis;
   json.legend = legend;
   json.tooltip = tooltip;
   json.plotOptions = plotOptions;
   json.credits = credits;
   json.series = series;
   $('#container').highcharts(json);

});
</script>
</body>
</html>
二运行结果
Highcharts 丢失值区域图

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