我有一个使用 highcharts v2.3.2 的应用程序。当我尝试将图表导出为 pdf 时，图例显示为模糊。我试图在 jsfiddle 上重现它，它似乎也可以在 highcharts 演示页面上的任何示例中重现。
$('#container').highcharts({
chart: {
type: 'spline'
},
title: {
text: 'Snow depth in the Vikjafjellet mountain, Norway'
},
subtitle: {
text: 'An example of irregular time data in Highcharts JS'
},
xAxis: {
type: 'datetime',
dateTimeLabelFormats: { // don't display the dummy year
month: '%e. %b',
year: '%b'
}
},
yAxis: {
title: {
text: 'Snow depth (m)'
},
min: 0
},
tooltip: {
formatter: function() {
return '<b>'+ this.series.name +'</b><br/>'+
Highcharts.dateFormat('%e. %b', this.x) +': '+ this.y +' m';
}
},
series: [{
name: 'Winter 2007-2008',
// Define the data points. All series have a dummy year
// of 1970/71 in order to be compared on the same x axis. Note
// that in JavaScript, months start at 0 for January, 1 for February etc.
data: [
[Date.UTC(1970, 9, 27), 0 ],
[Date.UTC(1970, 10, 10), 0.6 ],
[Date.UTC(1970, 10, 18), 0.7 ],
[Date.UTC(1970, 11, 2), 0.8 ],
[Date.UTC(1970, 11, 9), 0.6 ],
[Date.UTC(1970, 11, 16), 0.6 ],
[Date.UTC(1970, 11, 28), 0.67],
[Date.UTC(1971, 0, 1), 0.81],
[Date.UTC(1971, 0, 8), 0.78],
[Date.UTC(1971, 0, 12), 0.98],
[Date.UTC(1971, 0, 27), 1.84],
[Date.UTC(1971, 1, 10), 1.80],
[Date.UTC(1971, 1, 18), 1.80],
[Date.UTC(1971, 1, 24), 1.92],
[Date.UTC(1971, 2, 4), 2.49],
[Date.UTC(1971, 2, 11), 2.79],
[Date.UTC(1971, 2, 15), 2.73],
[Date.UTC(1971, 2, 25), 2.61],
[Date.UTC(1971, 3, 2), 2.76],
[Date.UTC(1971, 3, 6), 2.82],
[Date.UTC(1971, 3, 13), 2.8 ],
[Date.UTC(1971, 4, 3), 2.1 ],
[Date.UTC(1971, 4, 26), 1.1 ],
[Date.UTC(1971, 5, 9), 0.25],
[Date.UTC(1971, 5, 12), 0 ]
]
}]
});