jquery-highcharts获得json数据

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html" charset="gb2312" />
<title>饼图-例子</title>
<script src="js/jquery.min.js" type="text/javascript"></script>
<script src="js/highcharts.js" type="text/javascript"></script>
<script src="js/exporting.js" type="text/javascript"></script>
<script type="text/javascript">

   var chart;
$(document).ready(function() {
   var chart = new Highcharts.Chart({
      chart: {
         renderTo: 'container',
         plotBackgroundColor: null,
         plotBorderWidth: null,
         plotShadow: false
      },
      title: {
         text: 'Browser market shares at a specific website, 2010'
      },
      tooltip: {
         formatter: function() {
            return '<b>'+ this.point.name +'</b>: '+ this.percentage +' %';
         }
      },
      plotOptions: {
         pie: {
            allowPointSelect: true,
            cursor: 'pointer',
            dataLabels: {
               enabled: true,
               color: '#000000',
               connectorColor: '#000000',
               formatter: function() {
                  return '<b>'+ this.point.name +'</b>: '+ this.percentage +' %';
               }
            }
         }
      },
       series: [{
         type: 'pie',
         name: 'Browser share',
         data: [
            ['Firefox',   45.0],
            {
               name: 'IE',
               y: 26.8,
               sliced: true,
               selected: true
            },
            ['Chrome',    12.8],
            ['Safari',    8.5],
            ['Opera',     6.2],
            ['Others',   0.7]
         ]
      }]
   });

   function getForm(){
//var data = ["['Firefox',45.0]","[{name: 'Chrome',y: 26.8,sliced: true,selected: true}]","['IE',12.8]","['Safari',8.5]","['Opera',6.2]","['Others',0.7]"];
    //var data = "[{'Firefox',45.0},{'Chrome',26.8},{'IE',12.8},{'Safari',8.5},{'Opera',6.2},{'Others',0.7}]";

var data = [['Firefox',45.0],{name: 'Chrome',y: 26.8,sliced: true,selected: true},['IE',12.8],['Safari',8.5],['Opera',6.2],['Others',0.7]];


                chart.series[0].setData(data);



          chart.redraw();

        }


        $(document).ready(function() {
            //每隔3秒自动调用方法，实现图表的实时更新
           // window.setInterval(getForm,3000);
               getForm();
        });

});