在绑定数据的方法里，加入属性  lineStyle: {
                         normal: {
                            color: color[i%4],
                            width: 1,
                            opacity: 0.6,
                            curveness: 0.2
                        }
                    }

 var convertData = function (data) {
    var res = [];
    for (var i = 0; i < data.length; i++) {
        var dataItem = data[i];
        var fromCoord = geoCoordMap[dataItem[0].name];
        var toCoord = geoCoordMap[dataItem[1].name];
        if (fromCoord && toCoord) {
            res.push({
                fromName: dataItem[0].name,
                toName: dataItem[1].name,
                coords: [fromCoord, toCoord],
                    lineStyle: {
                        normal: {
                            color: color[i%4],
                            width: 1,
                            opacity: 0.6,
                            curveness: 0.2
                        }
                    }
            });
        }
    }
    console.log(res);
    return res;
};