diff --git a/src/core/engine/index.js b/src/core/engine/index.js
index 8d6fee67c6..b9534cc75a 100644
--- a/src/core/engine/index.js
+++ b/src/core/engine/index.js
@@ -28,9 +28,9 @@ export default class Engine extends EventEmitter {
 
   }
   run() {
-    
-      this.update();
-      this.engineID = requestAnimationFrame(this.run.bind(this));
+
+    this.update();
+    this.engineID = requestAnimationFrame(this.run.bind(this));
   }
   stop() {
     cancelAnimationFrame(this.engineID);
diff --git a/src/geo/project.js b/src/geo/project.js
index db3372da57..c4f57b99fe 100644
--- a/src/geo/project.js
+++ b/src/geo/project.js
@@ -15,18 +15,3 @@ export function aProjectFlat(lnglat) {
   y = scale * (c * y + d) - 106744817;
   return { x, y };
 }
-export function world2LngLat(x, y) {
-  const scale = 256 << 20;
-  let d = Math.PI / 180;
-  const a = 0.5 / Math.PI,
-    b = 0.5,
-    c = -0.5 / Math.PI;
-  d = 0.5;
-  x = ((x + 215440491) / scale - b) / a;
-  y = ((y + 106744817) / scale - d) / c;
-  y = (Math.atan(Math.pow(Math.E,y)) - (Math.PI / 4)) *2;
-  const lat  = y /d;
-  const lng = x / d;
-  return [lng,lat];
-}
-
diff --git a/src/map/gaodeMap.js b/src/map/gaodeMap.js
index 161df53f16..70f9dd8829 100644
--- a/src/map/gaodeMap.js
+++ b/src/map/gaodeMap.js
@@ -55,7 +55,7 @@ export default class GaodeMap {
 
   }
   containerToLngLat(pixel) {
-    const ll = new AMap.Pixel(pixel.x,pixel.y);
+    const ll = new AMap.Pixel(pixel.x, pixel.y);
     return this.map.containerToLngLat(ll);
   }
   setMapStyle(style) {