一、升级hightcharts
二、在调用hightcharts之前添加以下代码,即可正常显示
// Drop-in fix for Highcharts issue #8477 on older Highcharts versions. The
// issue is fixed since Highcharts v6.1.1.
Highcharts.wrap(Highcharts.Axis.prototype, 'getPlotLinePath', function(proceed) {
var path = proceed.apply(this, Array.prototype.slice.call(arguments, 1));
if (path) {
path.flat = false;
}
return path;
});