百度地图API：自定义控件

HTML：

<!DOCTYPE html>

<html>

<head>

  <meta name="viewport" content="initial-scale=1.0, user-scalable=no"/>

  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

  <title>Hello, World</title>

  <style type="text/css">

    html {

      height: 100%;

    }

    body {

      margin: 0px;

      padding: 0px;

      height: 100%;

    }

    #container {

      margin: 100px auto;

      width: 1300px;

      height: 700px;

    }

  </style>

</head>

<body>

<div id="container"></div>

</body>

</html>

JS：

<script type="text/javascript">

  var map = new BMap.Map("container");

  // 创建地图实例

  var point = new BMap.Point(118.024381, 36.812327);

  // 创建点坐标

  map.centerAndZoom(point, 15);

  // 初始化地图，设置中心点坐标和地图级别

  map.enableScrollWheelZoom(true);

  //自定义控件

  function ZoomControl() {

    this.defaultAnchor = BMAP_ANCHOR_TOP_LEFT;

    this.defaultOffest = new BMap.Control();

  }

  //通过JavaScript的prototype属性继承于BMap.Control

  ZoomControl.prototype = new BMap.Control();

  ZoomControl.prototype.initialize = function (map) {

    var div = document.createElement('div');

    div.appendChild(document.createTextNode("放大2级"));

    div.style.cursor = "pointer";

    div.style.border = "1px solid gray";

    div.style.backgroundColor = "white";

    div.onclick = function () {

      map.zoomTo(map.getZoom() + 2);

    };

    // 添加DOM元素到地图中

    map.getContainer().appendChild(div);

    // 将DOM元素返回

    return div;

  }

  // 创建控件实例

  var myZoomCtrl = new ZoomControl();

  // 添加到地图当中

  map.addControl(myZoomCtrl);

</script>

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百度地图API：自定义控件

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