修复 ElectronUnion 对象初始化问题

particles.py

@@ -144,6 +144,9 @@ class Nucleon:
     def __len__(self):
         return len(self.metadata)
 
+    def __hash__(self):
+        return hash(self.content)
+
     @staticmethod
     def placeholder():
         return Nucleon("核子对象样例内容", {})
@@ -197,7 +200,7 @@ class ElectronUnion():
             for i in all.keys():
                 lst.append(Electron(i, all[i]))
             self.electrons = lst
-            self.electrons_dict = {i.content: i.metadata for i in lst}
+            self.electrons_dict = {i.content: i for i in lst}
     
     def sync(self):
         """同步 electrons_dict 中新增对到 electrons 中"""