如图需求：
需要实现a与b的联动，且圆形覆盖物的半径可拖拽改变，a也可以设置圆形覆盖物的半径值；
代码如下：(经供参考)
<!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 {width: 100%;height: 100%;margin:0;font-family:"微软雅黑";}
#allmap{width:100%;height:500px;}
p{margin-left:5px; font-size:14px;}
</style>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=CHZaA3XBlwaD4pUsgV85pGQ5gpQbyhqC"></script>
<script type="text/javascript" src="js/jquery-1.9.1.min.js">
</script>
<title>圆形区域搜索</title>
</head>
<body>
<div><input type="number" name="" class="setRadio" value="" /></div>
<div
});
map.addOverlay(label);
labelArr.push(label);
}
});
}
}
var local = new BMap.LocalSearch(map, {renderOptions: {map: map, autoViewport: false}});
local.searchNearby('餐馆',mPoint,1000);
</script>