anychart.onDocumentReady(function () {
var dataTable = anychart.data.table();
dataTable.addData(get_dji_daily_short_data());
var mapping = dataTable.mapAs({high: 1, low: 3});
var chart = anychart.stock();
var series = plot.rangeSplineArea(mapping);
series.highStroke(function () {
return anychart.color.setThickness(anychart.color.darken(this.sourceColor), 2);
chart.title('Set high stroke parameter as a function');
chart.container('container');