对于highcharts柱状图的使用的两个技巧：
1、改变颜色

series: [{

                data: [{'color':'#F6BD0F','y':11},

                            {'color':'#AFD8F8','y':12},

                            {'color':'#8BBA00','y':13},

                            {'color':'#FF8E46','y':14},

                            {'color':'#008E8E','y':15},

                            {'color':'#D64646','y':16},

                            {'color':'#8E468E','y':17}], 

            }]

2、柱状图顶部显示数字

plotOptions: {

			column: {

				dataLabels: {

		            enabled: true

		        },

				pointPadding: 0.2,

				borderWidth: 0

			}

		},