rotateMarker.js

    // 能旋转的Marker类
    L.RotatedMarker = L.Marker.extend({
        options: {angle: 0},
        _setPos: function (pos) {
            L.Marker.prototype._setPos.call(this, pos);
            if (L.DomUtil.TRANSFORM) {
                // use the CSS transform rule if available
                this._icon.style[L.DomUtil.TRANSFORM] += ' rotate(' + this.options.angle + 'deg)';
            } else if (L.Browser.ie) {
                // fallback for IE6, IE7, IE8
                // Just ignore it!
            }
        }
    });
    L.rotatedMarker = function (pos, options) {
        return new L.RotatedMarker(pos, options);
    };
    
    // 将两个GPS坐标转换为角度
    function ConvertPositionAngel(soucePoint, targetPoint) {
        var res = (Math.atan2(targetPoint.y - soucePoint.y, targetPoint.x - soucePoint.x)) / Math.PI * 180.0;
        return (res >= 0 && res <= 180) ? res += 90 : ((res < 0 && res >= -90) ? res += 90 : res += 450);
    }

    // 实际使用
    
    var person = L.rotatedMarker(L.latLng(31.233, 121.465, 16), {
        icon: L.icon({
            iconUrl: './ic_navigation_white_24dp_2x.png',
            // 图标下载：http://www.google.com/design/icons/
            iconSize: [24, 24]

        }),
        draggable: true,
        direction: 45
    })
    
    var angleDeg = ConvertPositionAngel(
            {x: lastLatLng[0], y: lastLatLng[1]},
            {x: latlng[0], y: latlng[1]}
    )
    person.options.angle = (angleDeg - 90) % 360