diff --git a/DrissionPage/chromium_base.py b/DrissionPage/chromium_base.py
index d210210..e223242 100644
--- a/DrissionPage/chromium_base.py
+++ b/DrissionPage/chromium_base.py
@@ -10,13 +10,13 @@ from warnings import warn
 
 from requests import Session
 
-from .functions.tools import AlertExistsError
-from .functions.tools import get_usable_path
 from .base import BasePage
 from .chromium_driver import ChromiumDriver
 from .chromium_element import ChromiumWaiter, ChromiumScroll, ChromiumElement, run_js, make_chromium_ele, \
     ChromiumElementWaiter
+from .functions.errors import ContextLossError, ElementLossError, AlertExistsError
 from .functions.locator import get_loc
+from .functions.tools import get_usable_path
 from .functions.web import offset_scroll, cookies_to_tuple
 from .session_element import make_session_ele
 
@@ -139,6 +139,8 @@ class ChromiumBase(BasePage):
         end_time = perf_counter() + timeout
         while perf_counter() < end_time:
             state = self.ready_state
+            if state is None:  # 存在alert的情况
+                return None
 
             if self._debug_recorder:
                 self._debug_recorder.add_data((perf_counter(), 'waiting', state))
@@ -280,7 +282,10 @@ class ChromiumBase(BasePage):
     @property
     def ready_state(self):
         """返回当前页面加载状态，'loading' 'interactive' 'complete'"""
-        return self.run_cdp('Runtime.evaluate', expression='document.readyState;')['result']['value']
+        try:
+            return self.run_cdp('Runtime.evaluate', expression='document.readyState;')['result']['value']
+        except AlertExistsError:
+            return None
 
     @property
     def size(self):
@@ -350,18 +355,21 @@ class ChromiumBase(BasePage):
         :param cmd_args: 参数
         :return: 执行的结果
         """
+        if self.driver.has_alert and cmd != 'Page.handleJavaScriptDialog':
+            raise AlertExistsError('存在未处理的提示框。')
+
         r = self.driver.call_method(cmd, **cmd_args)
         if 'error' not in r:
             return r
 
         if 'Cannot find context with specified id' in r['error']:
-            raise RuntimeError('页面被刷新，请操作前尝试等待页面刷新或加载完成。')
+            raise ContextLossError('页面被刷新，请操作前尝试等待页面刷新或加载完成。')
         elif 'Could not find node with given id' in r['error']:
-            raise RuntimeError('该元素已不在当前页面中。')
+            raise ElementLossError('该元素已不在当前页面中。')
         elif 'tab closed' in r['error']:
             raise RuntimeError('标签页已关闭。')
         elif 'alert exists' in r['error']:
-            raise AlertExistsError('存在未处理的提示框。')
+            pass
         else:
             raise RuntimeError(r)
 
@@ -723,7 +731,10 @@ class ChromiumBase(BasePage):
             err = None
             result = self.run_cdp('Page.navigate', url=to_url)
 
-            is_timeout = not self._wait_loaded(timeout)
+            is_timeout = self._wait_loaded(timeout)
+            if is_timeout is None:
+                return None
+            is_timeout = not is_timeout
             self.wait.load_complete()
 
             if is_timeout:
diff --git a/DrissionPage/chromium_driver.py b/DrissionPage/chromium_driver.py
index 677b1c6..f5abac4 100644
--- a/DrissionPage/chromium_driver.py
+++ b/DrissionPage/chromium_driver.py
@@ -99,8 +99,8 @@ class ChromiumDriver(object):
 
                 except Empty:
                     if self.has_alert:
-                        return {'error': {'message': 'alert exists'},
-                                'type': 'alert_exists'}
+                        return {'error': {'message': 'alert exists'}, 'type': 'alert_exists'}
+
                     if isinstance(timeout, (int, float)) and timeout <= 0:
                         raise TimeoutError(f"调用{message['method']}超时。")
 
diff --git a/DrissionPage/chromium_element.py b/DrissionPage/chromium_element.py
index 9e0ba68..c1b5877 100644
--- a/DrissionPage/chromium_element.py
+++ b/DrissionPage/chromium_element.py
@@ -10,6 +10,7 @@ from time import perf_counter, sleep
 from warnings import warn
 
 from .base import DrissionElement, BaseElement
+from .functions.errors import ContextLossError, ElementLossError
 from .functions.locator import get_loc
 from .functions.web import make_absolute_link, get_ele_txt, format_html, is_js_func, location_in_viewport, offset_scroll
 from .keys import _keys_to_typing, _keyDescriptionForString, _keyDefinitions
@@ -47,7 +48,7 @@ class ChromiumElement(DrissionElement):
             self._node_id = self._get_node_id(obj_id=self._obj_id)
             self._backend_id = backend_id
         else:
-            raise RuntimeError('元素可能已失效。')
+            raise ElementLossError('原来获取到的元素对象已不在页面内。')
 
         doc = self.run_js('return this.ownerDocument;')
         self._doc_id = doc['objectId'] if doc else None
@@ -1291,27 +1292,27 @@ def run_js(page_or_ele, script, as_expr=False, timeout=None, args=None):
         obj_id = page_or_ele._root_id
         is_page = True
 
-    if as_expr:
-        res = page.driver.Runtime.evaluate(expression=script,
-                                           returnByValue=False,
-                                           awaitPromise=True,
-                                           userGesture=True,
-                                           timeout=timeout * 1000)
+    try:
+        if as_expr:
+            res = page.run_cdp('Runtime.evaluate', expression=script, returnByValue=False,
+                               awaitPromise=True, userGesture=True, timeout=timeout * 1000)
 
-    else:
-        args = args or ()
-        if not is_js_func(script):
-            script = f'function(){{{script}}}'
-        res = page.driver.Runtime.callFunctionOn(functionDeclaration=script,
-                                                 objectId=obj_id,
-                                                 arguments=[_convert_argument(arg) for arg in args],
-                                                 returnByValue=False,
-                                                 awaitPromise=True,
-                                                 userGesture=True)
+        else:
+            args = args or ()
+            if not is_js_func(script):
+                script = f'function(){{{script}}}'
+            res = page.run_cdp('Runtime.callFunctionOn', functionDeclaration=script, objectId=obj_id,
+                               arguments=[_convert_argument(arg) for arg in args], returnByValue=False,
+                               awaitPromise=True, userGesture=True)
 
-    if 'Cannot find context with specified id' in res.get('error', ''):
-        txt = '页面已被刷新，请尝试等待页面加载完成再执行操作。' if is_page else '元素已不在页面内。'
-        raise RuntimeError(txt)
+    except ContextLossError:
+        if is_page:
+            raise ContextLossError('页面已被刷新，请尝试等待页面加载完成再执行操作。')
+        else:
+            raise ElementLossError('原来获取到的元素对象已不在页面内。')
+
+    if res is None and page.driver.has_alert:  # 存在alert的情况
+        return None
 
     exceptionDetails = res.get('exceptionDetails')
     if exceptionDetails:
diff --git a/DrissionPage/functions/errors.py b/DrissionPage/functions/errors.py
new file mode 100644
index 0000000..8bd005b
--- /dev/null
+++ b/DrissionPage/functions/errors.py
@@ -0,0 +1,11 @@
+# -*- coding:utf-8 -*-
+class AlertExistsError(Exception):
+    pass
+
+
+class ContextLossError(Exception):
+    pass
+
+
+class ElementLossError(Exception):
+    pass
diff --git a/DrissionPage/functions/tools.py b/DrissionPage/functions/tools.py
index 1661d85..4b1b9cc 100644
--- a/DrissionPage/functions/tools.py
+++ b/DrissionPage/functions/tools.py
@@ -149,7 +149,3 @@ def unzip(zip_path, to_path):
 
     with ZipFile(zip_path, 'r') as f:
         return [f.extract(f.namelist()[0], path=to_path)]
-
-
-class AlertExistsError(Exception):
-    pass
diff --git a/DrissionPage/functions/tools.pyi b/DrissionPage/functions/tools.pyi
index 5d4ec05..a3673cb 100644
--- a/DrissionPage/functions/tools.pyi
+++ b/DrissionPage/functions/tools.pyi
@@ -29,6 +29,3 @@ def clean_folder(folder_path: Union[str, Path], ignore: list = None) -> None: ..
 
 
 def unzip(zip_path: str, to_path: str) -> Union[list, None]: ...
-
-
-class AlertExistsError(Exception): ...