大批量GPS坐标转百度坐标

    var result = [];
    var num = 0;
    var sum = xList.length;


   //坐标转换完之后的回调函数    

    tranCallback = function (point) {

        result.push(point.points[0]);

        //一个个点转换的过程中记录已转换点的个数         

            num++;       

        if (num == sum) {            

                drawPolyline(); //在最后一次画线         

        } else {             

               makeLine();  //循环坐标转换，并不画线     

      }

      }     

    function makeLine() {

        var gpsPoint = new BMap.Point(xList[num], yList[num]);         

        var convertor = new BMap.Convertor();        

         var pointArr = [];         

         pointArr.push(gpsPoint);         

        convertor.translate(pointArr, 1, 5, tranCallback);     

  }

  setTimeout(function () {

        makeLine();

    }, 1000);