实现思路：
1：添加绘制工具的监听事件
2：遍历取出坐标集合
copy代码直接运行测试即可（如果不需要获取经纬度，删除掉相应的方法代码即可）
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
body, html{ 100%;height: 100%;margin:0;font-family:"微软雅黑";}
#allmap { 100%; height:500px; overflow: hidden;}
#result {100%;font-size:12px;}
dl,dt,dd,ul,li{
margin:0;
padding:0;
list-style:none;
}
p{font-size:12px;}
dt{
font-size:14px;
font-family:"微软雅黑";
font-weight:bold;
border-bottom:1px dotted #000;
padding:5px 0 5px 5px;
margin:5px 0;
}
dd{
padding:5px 0 0 5px;
}
li{
line-height:28px;
}
</style>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=F0i6SrLmHquLVNLCqpExxPrj8mWVdFwx"></script>
<!--加载鼠标绘制工具-->
<script type="text/javascript" src="http://api.map.baidu.com/library/DrawingManager/1.4/src/DrawingManager_min.js"></script>
<link rel="stylesheet" href="http://api.map.baidu.com/library/DrawingManager/1.4/src/DrawingManager_min.css" />
<!--加载检索信息窗口-->
<script type="text/javascript" src="http://api.map.baidu.com/library/SearchInfoWindow/1.4/src/SearchInfoWindow_min.js"></script>
<link rel="stylesheet" href="http://api.map.baidu.com/library/SearchInfoWindow/1.4/src/SearchInfoWindow_min.css" />
<title>百度地图API功能演示</title>
</head>
<body>
<div id="allmap" style="overflow:hidden;zoom:1;position:relative;">
<div id="map" style="height:100%;-webkit-transition: all 0.5s ease-in-out;transition: all 0.5s ease-in-out;">
</div>
</div>
<div id="result">
<input type="button" value="获取绘制的覆盖物个数" onclick="alert(overlays.length)"/>
<input type="button" value="清除所有覆盖物" onclick="clearAll()"/>
<input type="button" value="获取多边形的顶点" onclick="getPoint()"/><br/>
<input type="button" value="开启线、面编辑功能" onclick="Editing('enable')"/>
<input type="button" value="关闭线、面编辑功能" onclick="Editing('disable')"/>
<input type="button" value="显示原有多边形" onclick="showPolygon(this)" /><br/>
<input type="button" value="画多边形" onclick="draw(BMAP_DRAWING_POLYGON)" />
<input type="button" value="画矩形" onclick="draw(BMAP_DRAWING_RECTANGLE)" />
<input type="button" value="画线" onclick="draw(BMAP_DRAWING_POLYLINE)" />
<!-- <input type="button" value="画点" onclick="draw(BMAP_DRAWING_MARKER)" />-->
<span>右键获取任意点的经纬度</span>
</div>
<div id="resultShape"></div>
<div id="shape">坐标为</div>
<script type="text/javascript">
function $(id){
return document.getElementById(id);
}
// 百度地图API功能
var map = new BMap.Map('map');
var poi = new BMap.Point(113.948913,22.530844);
map.centerAndZoom(poi, 16);
map.enableScrollWheelZoom();
var overlays = [];
var overlaycomplete = function(e){
overlays.push(e.overlay);
};
var styleOptions = {
strokeColor:"red", //边线颜色。
fillColor:"red", //填充颜色。当参数为空时，圆形将没有填充效果。
strokeWeight: 3, //边线的宽度，以像素为单位。
strokeOpacity: 0.8, //边线透明度，取值范围0 - 1。
fillOpacity: 0.6, //填充的透明度，取值范围0 - 1。
strokeStyle: 'solid' //边线的样式，solid或dashed。
}
//实例化鼠标绘制工具
var drawingManager = new BMapLib.DrawingManager(map, {
isOpen: false, //是否开启绘制模式
//enableDrawingTool: true, //是否显示工具栏
drawingToolOptions: {
anchor: BMAP_ANCHOR_TOP_RIGHT, //位置
offset: new BMap.Size(5, 5), //偏离值
},
circleOptions: styleOptions, //圆的样式
polylineOptions: styleOptions, //线的样式
polygonOptions: styleOptions, //多边形的样式
rectangleOptions: styleOptions //矩形的样式
});
//添加鼠标绘制工具监听事件，用于获取绘制结果
drawingManager.addEventListener('overlaycomplete', overlaycomplete);
map.addEventListener("rightclick",function(e){
if(confirm(e.point.lng + "," + e.point.lat)){
$("shape").innerHTML=$("shape").innerHTML+" <br/>("+e.point.lng+","+e.point.lat+")";
}
});
function draw(type){
drawingManager.open();
drawingManager.setDrawingMode(type);
}
function clearAll() {
for(var i = 0; i < overlays.length; i++){
map.removeOverlay(overlays[i]);
}
overlays.length = 0
}
function getPoint(){
$("resultShape").innerHTML='';
for(var i = 0; i < overlays.length; i++){
var overlay=overlays[i].getPath();
$("resultShape").innerHTML=$("resultShape").innerHTML+overlay.length+'边形:<br/>';
for(var j = 0; j < overlay.length; j++){
var grid =overlay[j];
$("resultShape").innerHTML=$("resultShape").innerHTML+(j+1)+"个点:("+grid.lng+","+grid.lat+");<br/>";
}
}
}
function Editing(state){
for(var i = 0; i < overlays.length; i++){
state=='enable'?overlays[i].enableEditing():overlays[i].disableEditing();
}
}
function showPolygon(btn){
var polygon = new BMap.Polygon([
new BMap.Point(113.941853,22.530777),
new BMap.Point(113.940487,22.527789),
new BMap.Point(113.94788,22.527597),
new BMap.Point(113.947925,22.530618)
], styleOptions); //创建多边形
map.addOverlay(polygon); //增加多边形
// overlays.push(polygon); //是否把该图像加入到编辑和删除行列
btn.setAttribute('disabled','false');
showText();
}
function showText(){
var opts = {
position : new BMap.Point(113.941853,22.530777), // 指定文本标注所在的地理位置
offset : new BMap.Size(30, 30) //设置文本偏移量
}
var label = new BMap.Label("不可编辑", opts); // 创建文本标注对象
label.setStyle({
color : "black",
fontSize : "16px",
fillColor:"red", //填充颜色。当参数为空时，圆形将没有填充效果。
});
map.addOverlay(label);
}
</script>
</body>
</html>