[Solved]-How to Disable Highchart Unit Display None-Highcharts

$(function () {

$('#container').highcharts({

    chart: {
        polar: true,
        type: 'line'
    },

    title: {
        text: 'Budget vs spending',
        x: -80
    },

    pane: {
        size: '80%'
    },

    xAxis: {
        categories: ['Sales', 'Marketing', 'Development', 'Customer Support', 
                'Information Technology', 'Administration'],
        tickmarkPlacement: 'on',
        lineWidth: 0
    },

    yAxis: {
        gridLineInterpolation: 'polygon',
        lineWidth: 0,
        min: 0,
        labels: {
          formatter: function() {
             return null;
          }
        },
        title: {
            text: '10'
        },            
    },

    tooltip: {
        shared: true,
        pointFormat: '<span style="color:{series.color}">{series.name}: <b>${point.y:,.0f}</b><br/>'
    },

    legend: {
        align: 'right',
        verticalAlign: 'top',
        y: 70,
        layout: 'vertical'
    },

    series: [{
        name: 'Allocated Budget',
        data: [43000, 19000, 60000, 35000, 17000, 10000],
        pointPlacement: 'on'
    }, {
        name: 'Actual Spending',
        data: [50000, 39000, 42000, 31000, 26000, 14000],
        pointPlacement: 'on'
    }]

 });
});

you can also check http://www.highcharts.com/docs/chart-design-and-style/colors for color and style