判空问题

src/models/UIManager.ts

@@ -31,7 +31,7 @@ export class UIManager extends Laya.Script {
 
   private UIRoot: Laya.Panel
   public getUIRoot(): Laya.Node {
-    if (this.UIRoot == null) {
+    if (!this.UIRoot) {
       this.UIRoot = this.owner.getChildByName("UIRoot") as Laya.Panel
       if (config.H_SCREEN) {
         this.UIRoot.width = config.DESIGN_HEIGHT

src/views/dc/DailyChallenge.ts

@@ -231,7 +231,7 @@ export class DailyChallenge extends Laya.Script {
                 unit.label_show.visible = false
             }
         }
-        if (this.selectedUnit == null)
+        if (!this.selectedUnit)
             this.selectedUnit = this.units[info.begin+info.dayCount-1]
         this.onApplyUnit(this.selectedUnit)
     }