//创建和初始化地图函数：
function initMap(id_selector, centerX, centerY, onaddress) {
	createMap(id_selector, centerX, centerY); //创建地图
	setMapEvent(); //设置地图事件
	addMapControl(); //向地图添加控件
	addMapOverlay(onaddress, centerY, centerX); //向地图添加覆盖物
}

function createMap(id_selector, centerX, centerY) {
	map = new BMap.Map(id_selector);
	//视图范围
	map.centerAndZoom(new BMap.Point(centerX, centerY), 18);
}

function setMapEvent() {
	map.enableScrollWheelZoom();
	map.enableKeyboard();
	map.enableDragging();
	map.enableDoubleClickZoom()
}

function addMapOverlay(onaddress, centerY, centerX) {
	//具体坐标
	var markers = [{
		title: onaddress,
		imageOffset: {
			width: -46,
			height: -21
		},
		position: {
			lat: centerY,
			lng: centerX
		}
	}];

	MapInfo(markers);
}

function MapInfo(markers) {
	for (var index = 0; index < markers.length; index++) {
		var point = new BMap.Point(markers[index].position.lng, markers[index].position.lat);
		var marker = new BMap.Marker(point, {
			icon: new BMap.Icon("https://api.map.baidu.com/lbsapi/createmap/images/icon.png", new BMap.Size(20, 25), {
				imageOffset: new BMap.Size(markers[index].imageOffset.width, markers[index].imageOffset.height)
			})
		});
		var label = new BMap.Label(markers[index].title, {
			offset: new BMap.Size(25, 5)
		});
		var opts = {
			width: 200,
			title: markers[index].title,
			enableMessage: false
		};
		var infoWindow = new BMap.InfoWindow(markers[index].content, opts);
		marker.setLabel(label);
		map.addOverlay(marker);
	};
}
//向地图添加控件
function addMapControl() {
	var scaleControl = new BMap.ScaleControl({
		anchor: BMAP_ANCHOR_BOTTOM_LEFT
	});
	scaleControl.setUnit(BMAP_UNIT_IMPERIAL);
	map.addControl(scaleControl);
	var navControl = new BMap.NavigationControl({
		anchor: BMAP_ANCHOR_TOP_LEFT,
		type: BMAP_NAVIGATION_CONTROL_LARGE
	});
	map.addControl(navControl);
}
var map;