增加ele.tree() 方法，用途：打印当前元素的子元素结构树，默认展开层数是5层

Signed-off-by: 刘华凯 <13959713+haiyang0726@user.noreply.gitee.com>

DrissionPage/_elements/chromium_element.py

@@ -9,6 +9,7 @@ from os.path import basename, sep
 from pathlib import Path
 from re import search
 from time import perf_counter, sleep
+from colorama import Fore, init
 
 from DataRecorder.tools import get_usable_path
 
@@ -123,6 +124,30 @@ class ChromiumElement(DrissionElement):
         """返回元素内所有文本，文本已格式化"""
         return get_ele_txt(make_session_ele(self.html))
     
+    def tree(self):
+        """打印当前元素的子元素结构树，默认展开层数是5层"""
+        init()
+        self.__tree(ele=self)
+
+    def __tree(self,ele, layer=5, last_one=False, body=''):
+        list_ele = ele.children(timeout=0.1)
+        length = len(list_ele)
+        body_unit = '    ' if last_one else '│   '
+        tail = '├───'
+        new_body = body + body_unit
+
+        if length > 0 and layer >= 1:
+            new_last_one = False
+            for i in range(length):
+                if i == length - 1:
+                    tail = '└───'
+                    new_last_one = True
+                e = list_ele[i]
+
+                print(f'{Fore.BLUE}{new_body}{tail}{Fore.CYAN}{i}<{e.tag}>  {Fore.RESET}{e.attrs}')
+
+                self.__tree(e, layer - 1, new_last_one, new_body)
+
     @property
     def raw_text(self):
         """返回未格式化处理的元素内文本"""