diff --git a/DrissionPage/__init__.py b/DrissionPage/__init__.py
index edd6064..c4cb7e4 100644
--- a/DrissionPage/__init__.py
+++ b/DrissionPage/__init__.py
@@ -13,4 +13,4 @@ from ._configs.chromium_options import ChromiumOptions
 from ._configs.session_options import SessionOptions
 
 __all__ = ['ChromiumPage', 'ChromiumOptions', 'SessionOptions', 'SessionPage', 'WebPage', '__version__']
-__version__ = '4.0.0b21'
+__version__ = '4.0.0b22'
diff --git a/DrissionPage/_pages/chromium_frame.py b/DrissionPage/_pages/chromium_frame.py
index 55653c3..2c77f01 100644
--- a/DrissionPage/_pages/chromium_frame.py
+++ b/DrissionPage/_pages/chromium_frame.py
@@ -57,8 +57,9 @@ class ChromiumFrame(ChromiumBase):
         self._rect = None
         end_time = perf_counter() + 5
         while perf_counter() < end_time:
-            if self.url is None or self.url == 'about:blank':
-                sleep(.1)
+            if self.url not in (None, 'about:blank'):
+                break
+            sleep(.1)
 
     def __call__(self, loc_or_str, timeout=None):
         """在内部查找元素
diff --git a/DrissionPage/_units/states.py b/DrissionPage/_units/states.py
index 00dfde9..f1744f9 100644
--- a/DrissionPage/_units/states.py
+++ b/DrissionPage/_units/states.py
@@ -171,3 +171,8 @@ class FrameStates(object):
         return not (self._frame.frame_ele.style('visibility') == 'hidden'
                     or self._frame.frame_ele.run_js('return this.offsetParent === null;')
                     or self._frame.frame_ele.style('display') == 'none')
+
+    @property
+    def has_alert(self):
+        """返回当前页面是否存在弹窗"""
+        return self._frame._has_alert
diff --git a/DrissionPage/_units/states.pyi b/DrissionPage/_units/states.pyi
index 102b1ea..fa8888c 100644
--- a/DrissionPage/_units/states.pyi
+++ b/DrissionPage/_units/states.pyi
@@ -85,3 +85,9 @@ class FrameStates(object):
 
     @property
     def ready_state(self) -> str: ...
+
+    @property
+    def is_displayed(self) -> bool: ...
+
+    @property
+    def has_alert(self) -> bool: ...
diff --git a/setup.py b/setup.py
index 7fc5b6b..9df76dc 100644
--- a/setup.py
+++ b/setup.py
@@ -6,7 +6,7 @@ with open("README.md", "r", encoding='utf-8') as fh:
 
 setup(
     name="DrissionPage",
-    version="4.0.0b21",
+    version="4.0.0b22",
     author="g1879",
     author_email="g1879@qq.com",
     description="Python based web automation tool. It can control the browser and send and receive data packets.",