百度地图标记没能显示

function setallcar(data, point) {  
                var map2 = new plus.maps.Map("map");  
                map2.centerAndZoom(point, 15);  
                map2.showUserLocation(true);  
                map2.clearOverlays();  
                for (var i = 0; i < data.length; i++) {  
                    var p = new plus.maps.Point(data[i]['location_y'], data[i]['location_x']);  
                    //添加覆盖物和圆圈  
                    var marker = new plus.maps.Marker(p);  
                    marker.setIcon("images/car.png");                     
                    /*var bubble = new plus.maps.Bubble(data[i]['car_name']);  
                    marker.setBubble(bubble);  
                    marker.onclick = function(marker) {  
                        var txtCar = document.getElementById("local");  
                        txtCar.innerHTML = data[i]['car_name'];  
                        isChoose = true;  
                    }*/  
                    /*var c = new plus.maps.Circle(p, 1000);  
                    c.setStrokeOpacity(0);  
                    c.setFillColor("#00BFFF");  
                    c.setFillOpacity(0.2);  
                    map2.addOverlay(c);*/  

                    map2.addOverlay(marker);  
                    console.log(JSON.stringify(map2));  
                }