Help: baidu map API map trajectory when scaling, trajectory can't according to the scaling chan-CodePudding

Main code below

 map. AddEventListener (' mousemove ', function (e) {
Var t=new BMap. Point (e.p oint, LNG, e.p oint. Lat); 
Map. RemoveOverlay (mk); 
Mk.=new BMap Marker (t, {icon: myIcon, rotation: 0, the title: '11111'});//create a standard logo 
The map. The addOverlay (mk);//add annotation to the map in the 
Var polyline=new BMap. Polylines ([
Last_point, 
T 
] and {strokeColor: "blue", strokeWeight: 2, strokeOpacity: 0.5});//create the line 
The map. The addOverlay (polylines); 
Last_point=t; 
})

Is according to the new coordinates and the coordinates of the attachment before, constantly adding mulch on layer before why can be according to the layer scale corresponding changes to draw the trajectory is chaos