�用(可不写)
        map.enableKeyboard();//启用键盘上下左右键移动地图
    }

    //地图控件添加函数：
    function addMapControl() {
        //向地图中添加缩放控件
        var ctrl_nav = new BMap.NavigationControl({anchor: BMAP_ANCHOR_TOP_LEFT, type: BMAP_NAVIGATION_CONTROL_LARGE});
        map.addControl(ctrl_nav);
        //向地图中添加缩略图控件
        var ctrl_ove = new BMap.OverviewMapControl({anchor: BMAP_ANCHOR_BOTTOM_RIGHT, isOpen: 1});
        map.add