Function filter

test/mapboxgl/overlay/MapvLayerSpec.js:156–161

(data)

    //删除数据
    it('removeData', (done) => {
        var filter = (data) => {
            if (mapvLayer.dataSet._data.indexOf(data) === 2) {
                return true
            }
            return false;
        };
        mapvLayer.removeData(filter);
        setTimeout(() => {
            expect(mapvLayer.dataSet._data.length).toEqual(999);