调用百度地图API实现路线的轨迹回放功能其实很简单，只要搞懂以下几点即可：
1.需要用Polyline方法先绘制好路线图
2.用Marker添加标注点
3.关键一步，通过结合定时器，使用Marker创建的标注点实例的setPosition改变标注点位置，，实现播放功能
代码分享，直接复制即可使用
<!DOCTYPE html><html><head><meta name="viewport" content="initial-scale=1.0, user-scalable=no" /><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Track</title><style type="text/css">html{height:100%}body{height:100%;margin:0px;padding:0px}#controller{width:100%; border-bottom:3px outset; height:30px; filter:alpha(Opacity=100); -moz-opacity:1; opacity:1; z-index:10000; background-color:lightblue;}#container{height:100%}</style><script type="text/javascript" src="?v=1.5&ak=D2b4558ebed15e52558c6a766c35ee73"></script><script type="text/javascript">//获取所有点的坐标var points = [new BMap.Point(114.00100, 22.550000), new BMap.Point(114.00130, 22.550000),new BMap.Point(114.00160, 22.550000), new BMap.Point(114.00200, 22.550000),new BMap.Point(114.00300, 22.550500), new BMap.Point(114.00400, 22.550000),new BMap.Point(114.00500, 22.550000), new BMap.Point(114.00505, 22.549800),new BMap.Point(114.00510, 22.550000), new BMap.Point(114.00515, 22.550000),new BMap.Point(114.00525, 22.550400), new BMap.Point(114.00537, 22.549500)];
var map; //百度地图对象var car; //汽车图标var label; //信息标签var centerPoint;
var timer; //定时器var index = 0; //记录播放到第几个point
var followChk, playBtn, pauseBtn, resetBtn; //几个控制按钮
function init() {followChk = document.getElementById("follow");playBtn = document.getElementById("play");pauseBtn = document.getElementById("pause");resetBtn = document.getElementById("reset");
//初始化地图,选取第一个点为起始点map = new BMap.Map("container");map.centerAndZoom(points[0], 15);map.enableScrollWheelZoom();map.addControl(new BMap.NavigationControl());map.addControl(new BMap.ScaleControl());map.addControl(new BMap.OverviewMapControl({isOpen: true}));
//通过DrivingRoute获取一条路线的pointvar driving = new BMap.DrivingRoute(map);driving.search(new BMap.Point(114.00100, 22.550000), new BMap.Point(113.95100, 22.550000));driving.setSearchCompleteCallback(function() {//得到路线上的所有pointpoints = driving.getResults().getPlan(0).getRoute(0).getPath();//画面移动到起点和终点的中间centerPoint = new BMap.Point((points[0].lng + points[points.length – 1].lng) / 2, (points[0].lat + points[points.length – 1].lat) / 2);map.panTo(centerPoint);//连接所有点map.addOverlay(new BMap.Polyline(points, {strokeColor: "black", strokeWeight: 5, strokeOpacity: 1}));
//显示小车子label = new BMap.Label("", {offset: new BMap.Size(-20, -20)});car = new BMap.Marker(points[0]);car.setLabel(label);map.addOverlay(car);
//点亮操作按钮playBtn.disabled = false;resetBtn.disabled = false;});}
function play() {playBtn.disabled = true;pauseBtn.disabled = false;
var point = points[index];if(index > 0) {map.addOverlay(new BMap.Polyline([points[index – 1], point], {strokeColor: "red", strokeWeight: 1, strokeOpacity: 1}));}label.setContent("经度: " + point.lng + "<br>纬度: " + point.lat);car.setPosition(point);index++;if(followChk.checked) {map.panTo(point);}if(index < points.length) {timer = window.setTimeout("play(" + index + ")", 200);} else {playBtn.disabled = true;pauseBtn.disabled = true;map.panTo(point);}}
function pause() {playBtn.disabled = false;pauseBtn.disabled = true;
if(timer) {window.clearTimeout(timer);}}
function reset() {followChk.checked = false;playBtn.disabled = false;pauseBtn.disabled = true;
if(timer) {window.clearTimeout(timer);}index = 0;car.setPosition(points[0]);map.panTo(centerPoint);}</script></head>
<body onload="init();"><div id="controller" align="center"><input id="follow" type="checkbox"><span style="font-size:12px;">画面跟随</span></input><input id="play" type="button" value="播放" onclick="play();" disabled /><input id="pause" type="button" value="暂停" onclick="pause();" disabled /><input id="reset" type="button" value="重置" onclick="reset()" disabled /></div><div id="container"></div></body></html>
却不去主动改变，而是放任它的生活态度。
