echartjs地图特效

var myChart = echarts.init(document.getElementById('chart1'));

var option = {
    title: {
        text: 'ECharts 地图点击事件示例',
        left: 'center'
    },
    tooltip: {
        trigger: 'item',
        formatter: '{b}<br/>{a}: {c}<br/>{d}%'
    },
    visualMap: {
        min: 0,
        max: 100,
        left: 'left',
        top: 'bottom',
        text: ['高', '低'],
        calculable: true
    },
    series: [
        {
            name: '访问来源',
            type: 'map',
            mapType: 'china',
            roam: true,
            data: [
                {name: '北京', value: 104},
                {name: '上海', value: 113},
                // ... 其他省份数据
            ]
        }
    ]
};

myChart.setOption(option);

myChart.on('click', function (params) {
    var area = params.seriesName;
    var value = params.value;
    if (area === '访问来源') {
        if (value < 50) {
            myChart.setOption({
                series: [{
                    data: [{name: '北京', value: value}],
                    itemStyle: {color: 'red'}
                }]
            });
        } else {
            myChart.setOption({
                series: [{
                    data: [{name: '北京', value: value}],
                    itemStyle: {color: 'green'}
                }]
            });
        }
    }
});