option = {
    series : [
        {
            name: '访问来源',
            type: 'pie',
            radius: '55%',
            data:[
                {value:235, name:'视频广告'},
                {value:274, name:'联盟广告'},
                {value:310, name:'邮件营销'},
                {value:335, name:'直接访问'},
                {value:400, name:'搜索引擎'}
            ],
            roseType: 'angle',
            itemStyle: {
                normal: {
                    shadowBlur: 200,
                    shadowColor: 'rgba(0, 0, 0, 0.5)'
                }
            }
        }
    ]
};