1：坐标取拾地址https://lbs.qq.com/getPoint/
2：在线代码运行地址https://lbs.qq.com/webDemoCenter/javascriptV2/polygon/circleRadius
3：图例
4：代码
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
<title>动态改变圆的半径</title>
<style type="text/css">
html,body{
width:100%;
height:100%;
}
#container{
width:100%;
height:90%;
}
*{
margin:0px;
padding:0px;
}
body, button, input, select, textarea {
font: 12px/16px Verdana, Helvetica, Arial, sans-serif;
}
#info {
margin-top: 10px;
}
</style>
<script charset="utf-8" src="https://map.qq.com/api/js?v=2.exp&key=OB4BZ-D4W3U-B7VVO-4PJWW-6TKDJ-WPB77"></script>
</script>
<script>
function init(){
var center=new qq.maps.LatLng(36.070299,120.370787);
var map=new qq.maps.Map(document.getElementById("container"),{
center:center,
zoom:14
});
//设置圆形覆盖物的颜色和透明度rgba
var circle_color = new qq.maps.Color(
Number(2),
Number(3),
Number(4),
0.1);
var circle=new qq.maps.Circle({
map:map,
center:center,
radius:300,
fillColor:circle_color,
strokeWeight:2
});
var radius=300;
setInterval(function(){
circle.setRadius(radius);
radius=radius+100;
if(radius>1000){
radius=300;
};
},5000);
}
window.οnlοad=init;
</script>
</head>
<body οnlοad="init()">
<div id="container"></div>
<div id="info">
<p>每隔500毫秒圆形覆盖物的半径改变一次。</p>
</div>
</body>
</html>
