如果页面栈为空则返回失败

src/utils/tools.ts

@@ -28,11 +28,19 @@ export const router = {
 
     //返回上页面
     navigateBack: (delta: number = 1, time = 0) => {
-        setTimeout(function() {
-            uni.navigateBack({
-                delta
-            })
-        }, time);
+        return new Promise<void>((resolve, reject) => {
+            setTimeout(function() {
+                uni.navigateBack({
+                    delta,
+                    success: () => {
+                        resolve();
+                    },
+                    fail: (err) => {
+                        reject(err);
+                    }
+                })
+            }, time);
+        });
     },
 
     //关闭所有页面，打开到应用内的某个页面