鼠标滑动，显示坐标

function showCoordinates(evt) {

var mp = evt.mapPoint;

var screenPt = map.toScreen(mp);

var str ="<p style=\"display:block\">"+ "屏幕坐标(x,y):" +"("+screenPt.x + "," + screenPt.y + ")"+"</p>";

dojo.byId("DivBottom").innerHTML = str+"地图坐标(x,y):"+"("+mp.x + ", "+ mp.y+")";

}