老师，我的代码是哪里有问题，设置级别没有用，谢谢

来源：3-12 自由编程

qq_慕移动3101913

2020-02-07 16:01:08

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script type="text/javascript" src="https://webapi.amap.com/maps?v=1.4.15&key=48259e2fd01bb69855450c5b97b5ea81"></script>
    <style type="text/css">
        *{margin: 0;padding: 0;}
        #container {width:100%; height: 100%; position: absolute;left: 0;top: 0;}
        #toolbar{
            width:300px; 
            height: 250px;
            background-color: #fff;
            position: absolute;
            z-index: 99;
            left: 10px;
            top: 10px;
            box-shadow: 1px 1px 5px black;
            background: white;
        }
        .title{
            width: 300px;
            height: 30px;
            text-align: center;
            line-height: 30px;
            font-weight: bold;
            margin-top: 20px;
            font-size: 16px;
        }
        .city{
            font-size: 13px;
            position: absolute;
            right: 37px;
            top: 53px;
        }
        
        .rank{
            font-size: 13px;
            position: absolute;
            right: 37px;
            top: 92px;
        }
        #btn1{
            width: 45px;
            height: 30px;
            color: #fff;
            font-size: 13px;
            background-color: #4169E1;
            border:none;
        } 
        #btn2{
            width: 45px;
            height: 30px;
            color: #fff;
            font-size: 13px;
            background-color:#4169E1;
            border:none;
        } 
        #clear{
            width: 100px;
            height: 30px;
            font-size: 13px;
            background-color: #C0C0C0;
            position: absolute;
            left: 110px;
            top: 131px;
            border:none;
        } 
        .kuang{
            width: 100px;
            height: 25px;
            padding-left: 5px;
        }
        .newest{
            position: absolute;
            right: 10px;
            bottom: 10px;
            font-size: 13px;
        }
    </style>
</head>
<body>
    <!-- 地图 -->
    <div id="container"></div>
    <!-- 工具栏 -->
    <div id='toolbar'>
        <p class="title">工具栏</p>
        <div class="city">搜索城市:
            <input class="kuang"  type="text" name="" id='city2'>
            <button id='btn1'>确定</button>
        </div>
        <div class="rank">设置显示级别:
            <input class="kuang" type="text" name="" id='zoomVal'>
            <button id='btn2'>确定</button>
        </div>
        <button id='clear'>解除范围限制</button>
        <p class="newest">当前所在省/直辖市：<span id='ne'></span></p>
    </div>
    <script type="text/javascript">
    //创建一个地图
    var map = new AMap.Map('container',{
            zoom:10, //初始的地图级别
            center:[116.379391,39.861536] //初始化地图的中心点
        });

    //设置地图显示范围为北京
    var myBounds = new AMap.Bounds([116.22422,39.813285],[116.567542,39.997639]);

    //限制地图显示在北京
    map.setBounds(myBounds);
    map.setLimitBounds(myBounds);

    //点击按钮搜索城市
    btn1.onclick = function(){
            map.setCity(city2.value);
        };

    //点击按钮搜索地图级别
    btn2.onclick = function(){
        map.setZoom(zoomVal.value);
    };
    
    //通过事件来给予中心点
    map.on('click',function(e){
            map.setCenter([e.lnglat.lng,e.lnglat.lat])
        });

    
    //通过事件解除显示限制
    clear.onclick = function(){
        if(clear.innerHTML === '解除范围限制'){
            map.clearLimitBounds(myBounds);
            clear.innerHTML = '已解除范围限制'
        }else if(clear.innerHTML === '已解除范围限制'){
            map.setLimitBounds(myBounds);
            clear.innerHTML = '解除范围限制'
        }
    };

    
    //为鼠标绑定moveend事件 ，当鼠标在地图上移动时 ，让工具栏的右下角显示当前省/直辖市。
    map.on('moveend',function(){
        map.getCity(function(info){
           ne.innerHTML=info.province;
            })
    });
   
    </script>
</body>
</html>

预算效果是：