应用：http://www.highcharts.com/demo/pie-basic

思路很不错

def all_courses_select_apply_pie
    @courses = CourseIntent.intent_course_ranking

    stat = {
      :notfull => 20, :full => 9, :over => 8, :empty => 11
    }
    render :json => stat
  end

.chart
      .page-chart.all-courses-select-apply-pie

jQuery ->
  jQuery('.page-chart.all-courses-select-apply-pie').each ->
    $chart = jQuery(this)


    jQuery.ajax
      url: '/charts/courses/all_courses_select_apply_pie'
      success: (res)->
        notfull = res.notfull
        over    = res.over
        full    = res.full
        empty   = res.empty


        option =
          chart:
            plotBackgroundColor: null
            plotBorderWidth: null
            plotShadow: false
            backgroundColor: null


          title:
            text: null


          plotOptions: 
            pie: 
              allowPointSelect: false
              showInLegend: true
              cursor: 'pointer'


          series: [
            {
              type: 'pie'
              name: '课程数'
              animation: false
              # point:
              #   events:
              #     click: (e)->
              #       location.href = "/manage/courses?select_apply_status=#{this.label}"


              dataLabels:
                format: '<b>{point.name}</b>: {point.y}'
                color: 'black'
                distance: 25
                style:
                  fontSize: '15px'
                  fontWeight: 'bold'
              data: [
                {
                  label: 'notfull'
                  name: '人数过少'
                  y: notfull
                  color: '#FEF093'
                },


                {
                  label: 'over'
                  name: '人数过多'
                  y: over
                  color: '#cc3333'
                },


                {
                  label: 'full'
                  name: '人数适合'
                  y: full
                  color: '#80CC00'
                },


                {
                  label: 'empty'
                  name: '无人选'
                  y: empty
                  color: '#CDCDCD'
                },
              ]
            }
          ]


        $chart.highcharts option