自定义事件

使用Map的emit和on方法，绑定和触发自定义事件。

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          <!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="chrome=1">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <title>自定义事件</title>
    <link rel="stylesheet" href="https://a.amap.com/jsapi_demos/static/demo-center/css/demo-center.css"/>
    <style>
        html,body,#container{
            height:100%;
            width:100%;
        }
    </style>
</head>
<body>
<div id="container" tabindex="0"></div>
<div class="input-card" style="width:18rem">
    <h4>自定义事件的绑定与解绑</h4>
    <div>
      <div class="input-item">
        <button id="bt1" class="btn" style="margin-right:1rem;">绑定事件</button>
        <button id="bt2" class="btn">解绑事件</button>
      </div>
    </div>
</div>
<div class="info" id="tip">
    给地图绑定自定义的count事件，实现新增marker点的计数<br>
    <span id="count">总共添加了0个Marker.</span>
</div>
<script type="text/javascript" src="https://webapi.amap.com/maps?v=1.4.15&key=您申请的key值"></script>
<script type="text/javascript">
    var map = new AMap.Map('container', {
        resizeEnable: true,
        zoom: 10,
        center: [116.39, 39.9]
    });
    var count = 0, clickListener;
    var _onClick = function(e) {
        new AMap.Marker({
            position: e.lnglat,
            map: map
        })
        map.emit('count', {count: count += 1});//触发自定义事件
    }
    var countDiv = document.getElementById('count');
    var _onCount = function(e) {
        countDiv.innerHTML = "总共添加了" + e.count + "个Marker.";
    }
    map.on("count", _onCount); //绑定自定义事件，返回监听对象

    var bind = function() {
        remove();//防止重复绑定
        clickListener = AMap.event.addListener(map, "click", _onClick);//绑定地图事件
    }
    var remove = function() {
        if (clickListener) {
            AMap.event.removeListener(clickListener);//移除地图事件，以绑定时返回的对象作为参数
        }
    }
    //绑定Dom事件
    var button1 = document.getElementById('bt1');
    var listener1 = AMap.event.addDomListener(button1, 'click', bind);//给div绑定单击事件  
    var button2 = document.getElementById('bt2');
    var listener2 = AMap.event.addDomListener(button2, 'click', remove);
</script>
</body>
</html>
        

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