highcharts延迟加载及刷新数据

<div id="container" style="min-width:400px;height:400px"></div>

$(function () {
    $(‘#container‘).highcharts({
        chart: {
            plotBackgroundColor: null,
            plotBorderWidth: null,
            plotShadow: false
        },
        title: {
            text: ‘2014 某网站上各个浏览器的访问量占比‘
        },
        tooltip: {
            headerFormat: ‘{series.name}<br>‘,
            pointFormat: ‘{point.name}: <b>{point.percentage:.1f}%</b>‘
        },
        plotOptions: {
            pie: {
                allowPointSelect: true,
                cursor: ‘pointer‘,
                dataLabels: {
                    enabled: false
                },
                showInLegend: true
            }
        },
        series: [{
            type: ‘pie‘,
            name: ‘浏览器访问量占比‘,
            data: [
                [‘Firefox‘,   45.0],
                [‘IE‘,       26.8],
                {
                    name: ‘Chrome‘,
                    y: 12.8,
                    sliced: true,
                    selected: true
                },
                [‘Safari‘,    8.5],
                [‘Opera‘,     6.2],
                [‘其他‘,   0.7]
            ]
        }]
    });
});

var options = {
    chart: {
        renderTo: ‘container‘,
        plotBackgroundColor: null,
        plotBorderWidth: null,
        marginLeft: 0,
        plotShadow: false
    },
    title: {
        text: ‘ ‘,
        useHTML: true
    },
    tooltip: {
        pointFormat: ‘<b>{point.name}</b>‘//鼠标上浮显示数据格式
    },
    exporting: {//导出按钮
        enabled: false
    },
    plotOptions: {
        pie: {
            allowPointSelect: true,
            cursor: ‘pointer‘,
            dataLabels: {
                enabled: true,
                format: ‘<b>{point.name}</b>‘, //显示说明的样式
                style: {
                    color: (Highcharts.theme && Highcharts.theme.contrastTextColor) || ‘black‘//颜色
                }
            },
            showInLegend: true
        }
    },
    series: [{
        type: ‘pie‘,//饼图
        name: ‘详情‘,
        data: []  //默认为空数据
     }]
};
function freshPage(dataJson){
    options.series[0].data = dataJson;//填充数据
    var chart = new Highcharts.Chart(options);//渲染图形
}

var data=[{name:‘test1‘,y:30},{name:‘test2‘,y:18}]//测试数据
 freshPage(data);

<input type=‘button‘ value="改变数据" onclick="changeData()"/> 

function changeData(){
    var data=[{name:‘test3‘,y:70},{name:‘test4‘,y:30}]
    options.series[0].data = data;
    var chart = new Highcharts.Chart(options);
}

$.post(url,[],function(data){
    data=eval(data);//传过来的字符串需要格式化为json
      freshPage(data);
})