var map = new BMapGL.Map('mapPosition');
var point = new BMapGL.Point(116.42023,40.03792);
map.centerAndZoom(point,18);
map.enableScrollWheelZoom(true);     //开启鼠标滚轮缩放
// 创建点标记
var marker = new BMapGL.Marker(point);
map.addOverlay(marker);
// 创建信息窗口
var opts = {
    width: 200,
    height: 100,
    title: 'Beijing Just Truth Invetment Holding Co.,Ltd.'
};
var infoWindow = new BMapGL.InfoWindow("<p style='font-size:12px;'>Tel:+8610-84934001</p><p style='font-size:12px;'>Address：A503, TianLangYuan Ao Cheng Rong Fu Center,Beiyuan Road, Chaoyang District, Beijing</p>", opts);
// 点标记添加点击事件
marker.addEventListener('click', function () {
    map.openInfoWindow(infoWindow, point); // 开启信息窗口
});