浏览器页面对象增加is_alive属性；下拉列表增加by_loc选择方式

DrissionPage/chromium_base.py

@@ -244,6 +244,15 @@ class ChromiumBase(BasePage):
         """返回页面是否正在加载状态"""
         return self._is_loading
 
+    @property
+    def is_alive(self):
+        """返回页面对象是否仍然可用"""
+        try:
+            self.run_cdp('Page.getLayoutMetrics')
+            return True
+        except TabClosedError:
+            return False
+
     @property
     def title(self):
         """返回当前页面title"""

DrissionPage/chromium_base.pyi

@@ -80,6 +80,9 @@ class ChromiumBase(BasePage):
     @property
     def is_loading(self) -> bool: ...
 
+    @property
+    def is_alive(self) -> bool: ...
+
     @property
     def url(self) -> str: ...
 

DrissionPage/chromium_element.py

@@ -1833,8 +1833,7 @@ class ChromiumSelect(object):
     @property
     def is_multi(self):
         """返回是否多选表单"""
-        multi = self._ele.attr('multiple')
-        return multi and multi.lower() != "false"
+        return self._ele.attr('multiple') is not None
 
     @property
     def options(self):
@@ -1891,6 +1890,25 @@ class ChromiumSelect(object):
         timeout = timeout if timeout is not None else self._ele.page.timeout
         return self._select(index, 'index', False, timeout)
 
+    def by_loc(self, loc, timeout=None):
+        """用定位符选择要选择的项
+        :param loc: 定位符
+        :param timeout: 超时时间
+        :return: 是否选择成功
+        """
+        eles = self._ele.eles(loc, timeout)
+        if not eles:
+            return False
+
+        if self.is_multi:
+            for ele in eles:
+                ele.run_js(f'this.selected=true;')
+            return True
+
+        eles[0].run_js(f'this.selected=true;')
+        return True
+
+
     def cancel_by_text(self, text, timeout=None):
         """此方法用于根据text值取消选择项。当元素是多选列表时，可以接收list或tuple
         :param text: 文本，传入list或tuple可取消多项

DrissionPage/chromium_element.pyi

@@ -511,6 +511,8 @@ class ChromiumSelect(object):
 
     def by_index(self, index: Union[int, list, tuple], timeout: float = None) -> bool: ...
 
+    def by_loc(self, loc: Union[str, Tuple[str, str]], timeout: float = None) -> bool: ...
+
     def cancel_by_text(self, text: Union[str, list, tuple], timeout: float = None) -> bool: ...
 
     def cancel_by_value(self, value: Union[str, list, tuple], timeout: float = None) -> bool: ...