如何删除 Bing 地图图例?

If you are using the v7.0, you can hide the scalebar by setting the property showScalebar to false in the constructor of the map (in the mapOption parameter), see the MSDN:
http://msdn.microsoft.com/en-us/library/gg427603.aspx
And here is an example:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script type="text/javascript" src="http://ecn.dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=7.0"></script>
<script type="text/javascript">
function GetMap()
{
// Set the map and view options, setting the map style to Road and
// removing the user's ability to change the map style
var mapOptions = {credentials:"Bing Maps Key",
height: 400,
width: 400,
showScalebar: false};
// Initialize the map
var map = new Microsoft.Maps.Map(document.getElementById("mapDiv"), mapOptions);
}
</script>
</head>
<body onload="GetMap();">
<div id='mapDiv' style="position:relative;"></div>
</body>
</html>