添加线

var line_source = new ol.source.Vector({
    features: []
});
for (var i = 0; i < _data.length; i++) {
    var _line = new ol.Feature({
        geometry: new ol.geom.LineString(_data[i].locations),//line_data是线段的定位点
        values: _data.values
    });
    _line.setStyle(_style);
    line_source.addFeature(_line);
}
//新建图层
var line_vector = new ol.layer.Vector({
    source: line_source,
    id: _id
});

map.addLayer(line_vector);