如何在google地图上添加自定义控件？

<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap" async defer></script>

<div id="map"></div>

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    center: {lat: 37.7749, lng: -122.4194}, // 设置地图中心点的经纬度
    zoom: 12 // 设置地图缩放级别
  });
}

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    center: {lat: 37.7749, lng: -122.4194},
    zoom: 12
  });

  var customControlDiv = document.createElement('div');
  var customControl = new CustomControl(customControlDiv, map);

  customControlDiv.index = 1;
  map.controls[google.maps.ControlPosition.TOP_RIGHT].push(customControlDiv);
}

function CustomControl(controlDiv, map) {
  // 创建自定义控件的DOM元素
  var controlUI = document.createElement('div');
  controlUI.style.backgroundColor = '#fff';
  controlUI.style.border = '2px solid #fff';
  controlUI.style.borderRadius = '3px';
  controlUI.style.boxShadow = '0 2px 6px rgba(0,0,0,.3)';
  controlUI.style.cursor = 'pointer';
  controlUI.style.marginTop = '8px';
  controlUI.style.marginRight = '8px';
  controlUI.style.textAlign = 'center';
  controlUI.title = 'Click to do something';
  controlDiv.appendChild(controlUI);

  // 创建自定义控件的内容
  var controlText = document.createElement('div');
  controlText.style.color = 'rgb(25,25,25)';
  controlText.style.fontFamily = 'Roboto,Arial,sans-serif';
  controlText.style.fontSize = '16px';
  controlText.style.lineHeight = '38px';
  controlText.style.paddingLeft = '5px';
  controlText.style.paddingRight = '5px';
  controlText.innerHTML = 'Custom Control';
  controlUI.appendChild(controlText);

  // 控件的点击事件处理函数
  controlUI.addEventListener('click', function() {
    // 在这里执行自定义控件的操作
  });
}