example/public/ueditor/third-party/highcharts/highcharts.src.js
function (e) {
		var chart = this.chart;
		return chart.inverted ? 
			chart.plotHeight + chart.plotTop - e.chartY : 
			e.chartX - chart.plotLeft;
	}
function (e) {
		var chart = this.chart;
		return chart.inverted ? 
			chart.plotHeight + chart.plotTop - e.chartY : 
			e.chartX - chart.plotLeft;
	}
function ( e ) { var chart = this . chart ; return chart . inverted ? chart . plotHeight + chart . plotTop - e . chartY : e . chartX - chart . plotLeft ; }
Return the index in the tooltipPoints array, corresponding to pixel position in
the plot area.
Return the index in the tooltipPoints array corresponding to pixel position in the plot area .