function track(){map.clearMap();//先清空地图$('.pos .posDesc').empty();$.getJSON('track.json',function(data){//这是获取数据var arr1=[];var arr=[];var startPot = [];var endPot = [];for(var i=0;i<data.gps.length;i++){var dt = data.gps[i].dTime;if(diff(dt,$st.val())>=0&&diff(dt,$et.val())<=0){arr1 = GPS.gcj_encrypt(data.gps[i].latY,data.gps[i].lngX);//坐标转换，消除坐标误差
                    arr.push([arr1.lon,arr1.lat]);}    }startPot = arr[0];endPot = arr[arr.length-1];var  marker=  new AMap.Marker({map: map,position: startPot,icon: "http://webapi.amap.com/images/car.png",//代表人物的图标offset: new AMap.Pixel(-26,-13),autoRotation: true//自动转弯（ie8及以下不支持）
         });//添加起点标志//绘制路线（利用官方的api，根据坐标绘制路线）var polyline = new AMap.Polyline({map: map,path: arr,strokeColor: "#9F9F5F",strokeWeight:6,lineJoin:"round"});//走过路线的样式var passedPolyline = new AMap.Polyline({map:map,strokeColor:"#006BB1 ",strokeWeight:6,isOutline:true,outlineColor:'#fff',showDir:true,lineJoin:"round"});//设置移动过的路线marker.on('moving',function(e){passedPolyline.setPath(e.passedPath);});//视野居中
     map.setFitView();AMap.event.addDomListener(start,'click',function(){marker.moveAlong(arr,speed.value);//设置移动路线及速度
         },false);AMap.event.addDomListener(pause,'click',function(){marker.pauseMove();//暂停运动
     },false);AMap.event.addDomListener(resume,'click',function(){marker.resumeMove();//继续运动},false);AMap.event.addDomListener(stop,'click',function(){marker.stopMove();//停止运动
         map.clearMap();},false);var stmarker = new AMap.Marker({map: map,position: startPot, //基点位置（起点）icon: "https://webapi.amap.com/theme/v1.3/markers/n/start.png",zIndex: 10});var endmarker = new AMap.Marker({map: map,position: endPot, //基点位置（终点）icon: "https://webapi.amap.com/theme/v1.3/markers/n/end.png",zIndex: 10});});    }