JS调用百度地图API实现自动获取地址与经纬度

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>点击地图获取地址和经纬度map，address，lng，lat</title>
  <meta name="robots" content="noindex, nofollow">
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
  <!-- 将百度地图API引入，设置好自己的key -->
  <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=7a6QKaIilZftIMmKGAFLG7QT1GLfIncg"></script>
</head>
<body>
<div class="main-div">
  <form method="post" action="" name="theForm" enctype="multipart/form-data" onsubmit="return validate()">
    <table cellspacing="1" cellpadding="3" width="100%">
      <tr>
        <td class="label">经度</td>
        <td><input type="text" name="lng" id="lng" value=""/>
        </td>
      </tr>
      <tr>
        <td class="label">纬度</td>
        <td><input type="text" name="lat" id="lat" value=""/>
        </td>
      </tr>
      <tr>
        <td class="label">地址</td>
        <td>
          <input type='text' value='' name='sever_add' id='sever_add' readonly>
          <input type='button' value='点击显示地图获取地址经纬度' id='open'>
        </td>
      </tr>
    </table>
  </form>
  <div id='allmap' style='width: 50%; height: 50%; position: absolute; display: none'></div>
</div>
</body>
</html>

<script type="text/javascript">
  function validate() {
    var sever_add = document.getElementsByName('sever_add')[0].value;
    if (isNull(sever_add)) {
      alert('请选择地址');
      return false;
    }
    return true;
  }
  //判断是否是空
  function isNull(a) {
    return (a == '' || typeof(a) == 'undefined' || a == null) ? true : false;
  }
  document.getElementById('open').onclick = function () {
    if (document.getElementById('allmap').style.display == 'none') {
      document.getElementById('allmap').style.display = 'block';
    } else {
      document.getElementById('allmap').style.display = 'none';
    }
  }
  var map = new BMap.Map("allmap");
  var geoc = new BMap.Geocoder();  //地址解析对象
  var markersArray = [];
  var geolocation = new BMap.Geolocation();
  var point = new BMap.Point(116.331398, 39.897445);
  map.centerAndZoom(point, 12); // 中心点
  geolocation.getCurrentPosition(function (r) {
    if (this.getStatus() == BMAP_STATUS_SUCCESS) {
      var mk = new BMap.Marker(r.point);
      map.addOverlay(mk);
      map.panTo(r.point);
      map.enableScrollWheelZoom(true);
    }
    else {
      alert('failed' + this.getStatus());
    }
  }, {enableHighAccuracy: true})
  map.addEventListener("click", showInfo);
  //清除标识
  function clearOverlays() {
    if (markersArray) {
      for (i in markersArray) {
        map.removeOverlay(markersArray[i])
      }
    }
  }
  //地图上标注
  function addMarker(point) {
    var marker = new BMap.Marker(point);
    markersArray.push(marker);
    clearOverlays();
    map.addOverlay(marker);
  }
  //点击地图时间处理
  function showInfo(e) {
    document.getElementById('lng').value = e.point.lng;
    document.getElementById('lat').value = e.point.lat;
    geoc.getLocation(e.point, function (rs) {
      var addComp = rs.addressComponents;
      var address = addComp.province + addComp.city + addComp.district + addComp.street + addComp.streetNumber;
      if (confirm("确定要地址是" + address + "?")) {
        document.getElementById('allmap').style.display = 'none';
        document.getElementById('sever_add').value = address;
      }
    });
    addMarker(e.point);
  }
</script>