怎么样使用js实现百度地图同时显示多个路书效果？

<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=自己的ak"></script>
<script type="text/javascript" src="js/lushu.js"></script><!--路书 -->

var BMapLib = window.BMapLib = BMapLib || {};
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 function d(e, f) {
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  this._html = f
 }
 d.prototype = new BMap.Overlay();
 d.prototype.initialize = function(e) {
  var f = this._div = a.dom
    .create(
      "div",
      {
       style : "border:solid 1px #ccc;width:auto;min-width:50px;text-align:center;position:absolute;background:#fff;color:#000;font-size:12px;border-radius: 10px;padding:5px;white-space: nowrap;"
      });
  f.innerHTML = this._html;
  e.getPanes().floatPane.appendChild(f);
  this._map = e;
  return f
 };
 d.prototype.draw = function() {
  this.setPosition(this.lushuMain._marker.getPosition(),
    this.lushuMain._marker.getIcon().size)
 };
 a.object.extend(d.prototype, {
  setPosition : function(h, i) {
   var f = this._map.pointToOverlayPixel(h), e = a.dom.getStyle(
     this._div, "width"), g = a.dom
     .getStyle(this._div, "height");
   overlayW = parseInt(this._div.clientWidth || e, 10),
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   this._div.style.left = f.x - overlayW / 2 + "px";
   this._div.style.bottom = -(f.y - i.height) + "px"
  },
  setHtml : function(e) {
   this._div.innerHTML = e
  },
  setRelatedClass : function(e) {
   this.lushuMain = e
  }
 })
})();

function showallrecord(starttime,endtime){//显示多条开始结束时间之间的自行车路书
 var bikeId=null;
 $.getJSON("./GetBickIdServlet",function(json){
  bikeId = json;//所有自行车编号
 });
 var json={
   "StartTime":starttime,//开始时间
   "EndTime":endtime//结束时间
 };
 //创建二维数组，例如pointArray[i]中i自行车编号，pointArray[i][j]为编号为i的自行车的所有借还站点信息
 $.getJSON("./GetAllRecordServlet",{json:JSON.stringify(json)},function(json){
  var j = 0;
  var stationlonlist=new Array();
  var stationlatlist=new Array();
  var pointArray=new Array();
  var bikeIdlist = new Array();
  for(var i = 0; i < bikeId.length; i++){
   stationlonlist[i] = new Array();
   stationlatlist[i] = new Array();
   pointArray[i] = new Array();
   bikeIdlist[i] = bikeId[i].BikeId;
  }
  var tt = json.length < 200?json.length:200;//如果查询出来的自行车借还站点记录多于200条，则显示200条。（待完善）
  for (var row = 0; row < pointArray.length; row++) {
   while (j < tt) {
    var k = j;
    var p = 0;
    var stationlon = parseFloat(json[j].Stationlon);// String类型转换成float类型
    stationlonlist[row][p]=stationlon;// 将stationlon放到stationlonlist里
    var stationlat = parseFloat(json[j].Stationlat);
    stationlatlist[row][p]=stationlat;// 将stationlat放到stationlatlist里
    pointArray[row][p] = new BMap.Point(stationlon,stationlat);
    while (bikeIdlist[row] == json[k + 1].BikeId) {
     k++;
     p++;
     stationlon= parseFloat(json[k].Stationlon);// String类型转换成float类型
     stationlonlist[row][p]=stationlon;// 将stationlon放到stationlonlist里
     stationlat= parseFloat(json[k].Stationlat);
     stationlatlist[row][p] =stationlat;// 将stationlat放到stationlatlist里
     pointArray[row][p] = new BMap.Point(stationlon, stationlat);
    }
    addMarkertest(pointArray,row);//添加标记点
    j = k + 1;
    break;
   }
   var bikespeedtest = speedtest(pointArray,row);//每辆自行车路书的速度
   polylinetest(pointArray,row,stationlonlist,stationlatlist);//每辆自行车借还站点间画折线
   lushutest(pointArray,bikespeedtest,row,stationlonlist,stationlatlist);//每辆自行车借还站点的路书路径
  }
  map.setViewport(pointArray);
 });
}

function speedtest(pointArray,row){//根据自行车的借还时间差来显示不同的路书速度（待完善）
 var distance = 0;//直行车走过的路径长度
 for(var i = 0; i < pointArray[row].length-1; i++){
  distance += (map.getDistance(pointArray[row][i],pointArray[row][i+1]));//自行车借还站点的路径长度
 }
 return distance/20;//速度=路径长度/时间（此处时间固定，可改为根据数据库读取的时间）
}

//
function polylinetest(pointArray,row,stationlonlist,stationlatlist){
 var points = new Array();
 for(var i = 0; i < pointArray[row].length; i++){
  points[i] = new BMap.Point(parseFloat(stationlonlist[row][i]), parseFloat(stationlatlist[row][i]));
 }
 //增加点与点之间的连线
 var polyline = new BMap.Polyline(points, {
  strokeColor : getColor(),
  strokeWeight : 2,
  strokeOpacity : 0.5
 }); // 创建折线
 map.addOverlay(polyline); // 绘制折线
}

//
function lushutest(pointArray,bikespeedtest,row,stationlonlist,stationlatlist){
 var points = new Array();
 for(var i = 0; i < pointArray[row].length; i++){
  points[i] = new BMap.Point(parseFloat(stationlonlist[row][i]), parseFloat(stationlatlist[row][i]));
 }
 var lushu = new BMapLib.LuShu(map, points, {
  defaultContent : "",
  autoView : true, // 是否开启自动视野调整，如果开启那么路书在运动过程中会根据视野自动调整
  icon : new BMap.Icon('photo/bike.png', new BMap.Size(22, 22), {
   anchor : new BMap.Size(10, 25)
  }),
  // enableRotation: true, //是否设置marker随着道路的走向进行旋转
  speed : bikespeedtest,
 }); 
 lushu.start();
}

//生成折线的随机颜色
function sj16(){
 var sjshu=Math.round(Math.random()*10*2);
 do
 {
  sjshu=Math.round(Math.random()*10*2);
 }while (sjshu>=14);
 return sjshu;
}
function getColor(){
 var hex = ['1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'];
 var yanse="";
 for(i=0; i<6; i++){
  yanse+=hex[sj16()];
 }
 return "#"+yanse
}