google Map api地理位置坐标转换

<!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>
    <meta http-equiv="content-type" content="text/html; charset=utf-8" />
    <title>地理位置坐标转换</title>
    <script src="http://ditu.google.cn/maps?file=api&v=2&key=ABQIAAAAe3YR_oZq7RQougOHlEQYxRTrT8HRiYVHGz6s-cexYhuHznMTnBQJ3hrfCSvSmQ_Fqr80B62kDy8djA&sensor=true"
        type="text/javascript"></script>
    <script type="text/javascript">
        window.g = {};
        window.$ = function (id) { return document.getElementById(id) };
        window.onload = function () {
            if (GBrowserIsCompatible()) {
                g.map = new GMap2($("map"));
                //加载google地图控件
                g.map.addControl(new GLargeMapControl());
                g.map.addControl(new GMapTypeControl());
                g.map.addControl(new GScaleControl());
                //实例化google客户端地理编码类(GClientGeocoder)
                g.geocoder = new GClientGeocoder();

                g.getCoordinates = function (address) {
                    g.geocoder.getLatLng(
                    address,
                    function (point) {
                        if (point) {
                            alert(point.lat());
                            alert(point.lng());

                            g.map.setCenter(point, 13);
                            var marker = new GMarker(point);
                            g.map.addOverlay(marker);
                            var info = "<strong>" + address + "</strong><br />坐标: " + point.lat() + "," + point.lng();
                            $("info").innerHTML = info;
                            marker.openInfoWindowHtml(info);
                            marker.__address_info = info;
                            GEvent.addListener(marker, "click", function () {
                                g.map.setCenter(this.getLatLng());
                                this.openInfoWindowHtml(this.__address_info);
                                $("info").innerHTML = info;
                            });
                        }
                        else {
                            alert("无法解析: " + address);
                        }
                    }
                )
                }

                $("btn_go").onclick = function () {
                    g.getCoordinates($("address").value);
                }
                $("btn_go").onclick();
            }
            else {
                alert('不支持的浏览器');
            }
        }
        window.onunload = function () {
            GUnload();
        }
    </script>
    <style media="screen">
        body
        {
            margin: 0;
            padding: 0;
            font-size: 9pt;
            line-height: 1.5em;
        }
        #frame
        {
            width: 700px;
            margin: 20px auto 10px;
        }
        #form
        {
            margin: 0 0 10px;
            text-align: center;
        }
        #form input
        {
            border: 1px solid #ccc;
            font-size: 9pt;
            width: 200px;
        }
        #form button
        {
            font-size: 9pt;
            border: 1px solid #ccc;
        }
        #form button:hover
        {
            background: #eef;
        }
        #map
        {
            height: 400px;
            margin: 0 0 10px;
            border: 5px solid #ccc;
        }
        #vifix
        {
            text-align: center;
        }
        #vifix a
        {
            color: #f00;
            text-decoration: none;
        }
        #vifix a:hover
        {
            color: #f96;
        }
    </style>
</head>
<body>
    <div id="frame">
        <div id="form">
            输入一个地址:
            <input id="address" value="杭州市西湖三潭印月" />
            <button id="btn_go">
                获取坐标</button>
        </div>
        <div id="map">
        </div>
        <div id="info">
        </div>
        <div id="vifix">
            Powered by <a href="http://code.google.com/apis/maps/" target="_blank">Google Map API</a>
            / Created by <a href="http://vifix.cn%22%3evifix.cn%3c/a>
        </div>
    </div>
</body>
</html>

直接拷贝运行即可。对于简单的应用，这个示例已经足够了！