为什么这样一段显示google map的代码在运行的时候看不到地图
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Detail.aspx.cs" Inherits="EMC.obj.Detail" %>
<%@ Register src="../component/BannerModule.ascx" tagname="BannerModule" tagprefix="uc3" %>
<%@ Register src="../component/ListModule.ascx" tagname="ListModule" tagprefix="uc4" %>
<!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 runat="server">
<title>EMC设备详情</title>
<style type="text/css">
.style1
{
width: 110px;
}
</style>
<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
function initialize() {
var latlng = new google.maps.LatLng(-34.397, 150.644);
var myOptions = {
zoom: 8,
center: latlng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
}
</script>
</head>
<body onload="initialize()">
<form id="form1" runat="server">
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:EMCConnectionString %>"
SelectCommand="SELECT [SiteName], [SiteID] FROM [MonitoringSite]">
</asp:SqlDataSource>
<div>
<uc3:BannerModule ID="BannerModule1" runat="server" />
<uc4:ListModule ID="ListModule1" runat="server" />
</div>
<br /><br />
<table width="100%" border="0">
<tr>
<td class="style1">
<asp:CheckBoxList ID="CheckBoxList1" runat="server" AutoPostBack="True"
DataSourceID="SqlDataSource1" DataTextField="SiteName" DataValueField="SiteID" >
</asp:CheckBoxList>
</td>
<td>
<%--google map操作--%>
<div id="map_canvas" style="width:80; height:80"></div>
</td>
</tr>
</table>
</form>
</body>
</html>
