diff --git a/core/Common/String.cpp b/core/Common/String.cpp
index 6200aaf1..cd44d168 100644
--- a/core/Common/String.cpp
+++ b/core/Common/String.cpp
@@ -46,6 +46,50 @@ e2d::String & e2d::String::operator=(const char *cstr)
 	return (*this);
 }
 
+e2d::String & e2d::String::format(const char * format, ...)
+{
+	std::string tmp;
+
+	va_list marker = NULL;
+	va_start(marker, format);
+
+	size_t num_of_chars = _vscprintf(format, marker);
+
+	if (num_of_chars > tmp.capacity()) 
+	{
+		tmp.resize(num_of_chars + 1);
+	}
+
+	vsprintf_s(const_cast<LPSTR>(tmp.data()), tmp.capacity(), format, marker);
+
+	va_end(marker);
+
+	m_str = static_cast<wchar_t*>(_bstr_t(tmp.c_str()));
+	return (*this);
+}
+
+e2d::String & e2d::String::format(const wchar_t * format, ...)
+{
+	std::wstring tmp;
+
+	va_list marker = NULL;
+	va_start(marker, format);
+
+	size_t num_of_chars = _vscwprintf(format, marker);
+
+	if (num_of_chars > tmp.capacity())
+	{
+		tmp.resize(num_of_chars + 1);
+	}
+
+	vswprintf_s(const_cast<LPWSTR>(tmp.data()), tmp.capacity(), format, marker);
+
+	va_end(marker);
+
+	m_str = tmp.c_str();
+	return (*this);
+}
+
 e2d::String & e2d::String::operator=(const String &str)
 {
 	m_str = str.m_str;
diff --git a/core/Transition/ETransition.cpp b/core/Transition/Transition.cpp
similarity index 100%
rename from core/Transition/ETransition.cpp
rename to core/Transition/Transition.cpp
diff --git a/core/Transition/ETransitionEmerge.cpp b/core/Transition/TransitionEmerge.cpp
similarity index 100%
rename from core/Transition/ETransitionEmerge.cpp
rename to core/Transition/TransitionEmerge.cpp
diff --git a/core/Transition/ETransitionFade.cpp b/core/Transition/TransitionFade.cpp
similarity index 100%
rename from core/Transition/ETransitionFade.cpp
rename to core/Transition/TransitionFade.cpp
diff --git a/core/Transition/ETransitionMove.cpp b/core/Transition/TransitionMove.cpp
similarity index 100%
rename from core/Transition/ETransitionMove.cpp
rename to core/Transition/TransitionMove.cpp
diff --git a/core/ecommon.h b/core/ecommon.h
index 9dde1c76..4b785361 100644
--- a/core/ecommon.h
+++ b/core/ecommon.h
@@ -148,9 +148,12 @@ public:
 	// 将字符串转化为 bool 型
 	bool toBool() const;
 
-	// 将任意类型转化为字符串
+	// 将数字转化为字符串
 	template<typename T>
-	static String toString(const T value);
+	static String toString(T value);
+
+	String& format(const char * format, ...);
+	String& format(const wchar_t * format, ...);
 
 	// 赋值运算符
 	String& operator= (const String &);
@@ -712,12 +715,11 @@ protected:
 // String 类模板函数定义
 
 template<typename T>
-inline e2d::String e2d::String::toString(const T value)
+inline e2d::String e2d::String::toString(T value)
 {
-	std::wostringstream ss;
-	ss << value;
-	String str = ss.str().c_str();
-	return std::move(str);
+	String tmp;
+	tmp.m_str = std::to_wstring(value);
+	return std::move(tmp);
 }
 
 }
\ No newline at end of file
diff --git a/project/vs2017/Easy2D.vcxproj b/project/vs2017/Easy2D.vcxproj
index 97e6fea6..c657b98e 100644
--- a/project/vs2017/Easy2D.vcxproj
+++ b/project/vs2017/Easy2D.vcxproj
@@ -240,10 +240,10 @@
     <ClCompile Include="..\..\core\Tool\Music.cpp" />
     <ClCompile Include="..\..\core\Tool\Random.cpp" />
     <ClCompile Include="..\..\core\Tool\Timer.cpp" />
-    <ClCompile Include="..\..\core\Transition\ETransition.cpp" />
-    <ClCompile Include="..\..\core\Transition\ETransitionEmerge.cpp" />
-    <ClCompile Include="..\..\core\Transition\ETransitionFade.cpp" />
-    <ClCompile Include="..\..\core\Transition\ETransitionMove.cpp" />
+    <ClCompile Include="..\..\core\Transition\Transition.cpp" />
+    <ClCompile Include="..\..\core\Transition\TransitionEmerge.cpp" />
+    <ClCompile Include="..\..\core\Transition\TransitionFade.cpp" />
+    <ClCompile Include="..\..\core\Transition\TransitionMove.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\core\eactions.h" />
diff --git a/project/vs2017/Easy2D.vcxproj.filters b/project/vs2017/Easy2D.vcxproj.filters
index 853d15b8..9c947391 100644
--- a/project/vs2017/Easy2D.vcxproj.filters
+++ b/project/vs2017/Easy2D.vcxproj.filters
@@ -27,18 +27,6 @@
     </Filter>
   </ItemGroup>
   <ItemGroup>
-    <ClCompile Include="..\..\core\Transition\ETransitionFade.cpp">
-      <Filter>Transition</Filter>
-    </ClCompile>
-    <ClCompile Include="..\..\core\Transition\ETransitionEmerge.cpp">
-      <Filter>Transition</Filter>
-    </ClCompile>
-    <ClCompile Include="..\..\core\Transition\ETransitionMove.cpp">
-      <Filter>Transition</Filter>
-    </ClCompile>
-    <ClCompile Include="..\..\core\Transition\ETransition.cpp">
-      <Filter>Transition</Filter>
-    </ClCompile>
     <ClCompile Include="..\..\core\Base\Input.cpp">
       <Filter>Base</Filter>
     </ClCompile>
@@ -189,6 +177,18 @@
     <ClCompile Include="..\..\core\Tool\Path.cpp">
       <Filter>Tool</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\core\Transition\Transition.cpp">
+      <Filter>Transition</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\core\Transition\TransitionEmerge.cpp">
+      <Filter>Transition</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\core\Transition\TransitionFade.cpp">
+      <Filter>Transition</Filter>
+    </ClCompile>
+    <ClCompile Include="..\..\core\Transition\TransitionMove.cpp">
+      <Filter>Transition</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\core\etools.h" />