经纬度nan问题

src/main/webapp/static/js/scan.js

@@ -133,7 +133,7 @@ function getTimeCp(roadId) {
                         '                                <span class="down-arrow"></span>\n' +
                         '                            </div>\n' +
                         '                        </td>\n' +
-                        '                        <td>'+Number(e.checkpointLatitude).toFixed(6)+','+Number(e.checkpointLongitude).toFixed(6)+'</td>\n' +
+                        '                        <td>'+Number(e.checkpointLatitude == null? "0" : e.checkpointLatitude).toFixed(6)+','+Number(e.checkpointLongitude==null?"0":e.checkpointLongitude).toFixed(6)+'</td>\n' +
                         '                    </tr>');
                 })
                 getGpsCp(roadId);