在地图中删除ImageOverlay

Question

我在if句子中替换图像时遇到很大问题。我先删除图像。但是当我在if句子里面时，我无法放置一个新的图像。

var image= 'garage.png'; 
 var imageUrl = image,
 imageBounds = L.latLngBounds([
        [63.431004174, 10.397958755],
        [63.430433118, 10.399938226]])
var map = L.mapbox.map('map', 'examples.map-i86nkdio').fitBounds(imageBounds);
var overlay = L.imageOverlay(imageUrl, imageBounds).addTo(map);
map.removeLayer(overlay);



 // this is the if  that appears later in the code //



 function changeImages(newValue){
  var slider = newValue; 



if(slider < 5){

    var image = 'garageAltered.png';
    var imageUrl = image,imageBounds = L.latLngBounds([
        [63.431004174, 10.397958755],
        [63.430433118, 10.399938226]])
   var map = L.mapbox.map('map', 'examples.map-i86nkdio')
    .fitBounds(imageBounds);
    var overlay = L.imageOverlay(imageUrl, imageBounds).addTo(map);

}



  }