var option = {
        title : {
            text: '某站点用户访问来源',
            subtext: '纯属虚构',
            x:'center'
        },
        tooltip : {
            trigger: 'item',
            formatter: "{a} <br/>{b} : {c} ({d}%)"
        },
        legend: {
            orient: 'vertical',
            left: 'left',
            data: ['直接访问','邮件营销']//'联盟广告','视频广告','搜索引擎'
        },
        series : [
            {
                name: '访问来源',
                type: 'pie',
                radius : '55%',
                center: ['50%', '60%'],
                data:[
                    {value:335, name:'直接访问'},
                    {value:310, name:'邮件营销'}/*,
                    {value:234, name:'联盟广告'},
                    {value:135, name:'视频广告'},
                    {value:1548, name:'搜索引擎'}*/
                ],
                itemStyle: {
                    emphasis: {
                        shadowBlur: 10,
                        shadowOffsetX: 0,
                        shadowColor: 'rgba(0, 0, 0, 0.5)'
                    }
                }
            }
        ]
    };
    var myChart = echarts.init(d3.select("#main").node());
    myChart.setOption(option);
    //更新option数据
    option.series[0].data.push({value:234, name:'联盟广告'});
    option.legend.data.push('联盟广告');
    myChart.setOption(option);