 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:[
          