高德地图 JS API示例-事件系统-地图事件- › 地图缩放相关事件

<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <title>事件系统</title>
    <link rel="stylesheet" href="https://a.amap.com/jsapi_demos/static/demo-center/css/demo-center.css" />
   
    <style>
        html,
        body,
        #container {
          width: 100%;
          height: 100%;
        }
    </style>
</head>
<body>
<div id="container"></div>
<div class="info">
    <h4 id="text"></h4>
    <p>当前级别：<span id="map-zoom">15</span></p>
</div>
<div class="input-card" style="width:16rem">
    <h4>地图缩放相关事件</h4>
    <div>
      <div class="input-item">
        <button id="zoomOn" class="btn" style="margin-right:1rem;">绑定事件</button>
        <button id="zoomOff" class="btn">解绑事件</button>
      </div>
    </div>
</div>
<div id="tip"></div>
<script type="text/javascript" src="https://webapi.amap.com/maps?v=1.4.15&key=您申请的key值"></script>
<script src="https://a.amap.com/jsapi_demos/static/demo-center/js/demoutils.js"></script>
<script type="text/javascript">
    //初始化地图对象，加载地图
    var map = new AMap.Map("container", {
        resizeEnable: true
    });


    var logMapinfo = function (){
        var zoom = map.getZoom(); //获取当前地图级别
        document.querySelector("#map-zoom").innerText = zoom;
    };
    logMapinfo();

    function mapZoomstart(){
        document.querySelector("#text").innerText = '缩放开始';
    }
    function mapZoom(){
        logMapinfo();
        document.querySelector("#text").innerText = '正在缩放';
    }
    function mapZoomend(){
        document.querySelector("#text").innerText = '缩放结束';
    }
        
    // 事件绑定
    function zoomOn(){
        log.success("绑定事件!");  
        map.on('zoomstart', mapZoomstart);
        map.on('zoomchange', mapZoom);
        map.on('zoomend', mapZoomend);
    }
    // 解绑事件
    function zoomOff(){
        log.success("解除事件绑定!"); 
        map.off('zoomstart', mapZoomstart);
        map.off('zoomchange', mapZoom);
        map.off('zoomend', mapZoomend);
    }
    
    // 给按钮绑定事件
    document.getElementById("zoomOn").onclick = zoomOn;
    document.getElementById("zoomOff").onclick = zoomOff;


</script>
</body>
</html>

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