web gis系统中由客户端计算坐标的封装 使用方法: var coor = new Coordinate(); //鼠标移动函数 function mousemove(x,y) { // var point = {x:x,y:y}; window.status = coor.toMapString(x,y); //window.frames['topmapFrame'].frames['topmap_map'].document.body.focus(); }