highchart值为null的数据点
某些情况下，数据点可能无数据，此时，需要对无数据点的画法进行定义，connectNulls属性定义null数据点的画法：
- false：缺省值，即不显示数据点。
- true：显示拟合曲线。
以line类型图形为例：
<html>
<head>
<meta charset="UTF-8" />
<title>Highcharts 教程 | 菜鸟教程(runoob.com)</title>
<script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="https://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() {
var chart = {
type: 'spline'
};
var title = {
text: 'Monthly Average Temperature'
};
var subtitle = {
text: 'Source: WorldClimate.com'
};
var xAxis = {
categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
};
var yAxis = {
title: {
text: 'Temperature'
},
labels: {
formatter: function () {
return this.value + '\xB0';
}
},
lineWidth: 2
};
var tooltip = {
crosshairs: true,
shared: true
};
var plotOptions = {
spline: {
marker: {
radius: 4,
lineColor: '#666666',
lineWidth: 1
}
}
};
var series= [{
name: 'Tokyo',
marker: {
symbol: 'square'
},
connectNulls: false,
data: [7.0, 6.9, 9.5, null, null, null, 25.2, {
y: 26.5,
marker: {
symbol: 'url(http://www.highcharts.com/demo/gfx/sun.png)'
}
}, 23.3, 18.3, 13.9, 9.6]
}, {
name: 'London',
marker: {
symbol: 'diamond'
},
data: [{
y: 3.9,
marker: {
symbol: 'url(http://www.highcharts.com/demo/gfx/snow.png)'
}
}, 4.2, 5.7, 8.5, 11.9, 15.2, 17.0, 16.6, 14.2, 10.3, 6.6, 4.8]
}
];
var json = {};
json.chart = chart;
json.title = title;
json.subtitle = subtitle;
json.tooltip = tooltip;
json.xAxis = xAxis;
json.yAxis = yAxis;
json.series = series;
json.plotOptions = plotOptions;
$('#container').highcharts(json);
});
</script>
</body>
</html>
connectNulls: false的效果：
connectNulls: true的效果：
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