diff --git a/Demo/main.cpp b/Demo/main.cpp
index 6ff350d7..8ffc99f0 100644
--- a/Demo/main.cpp
+++ b/Demo/main.cpp
@@ -11,13 +11,12 @@ int WINAPI WinMain(
 	if (!EApp::init(L"Demo", 250, 150))
 		return -1;
 
-	EString str = L"1245";
+	wchar_t str[] = L"1245";
 	EString str2 = L"1243";
 
-	bool b = str > str2;
-	bool b2 = str >= str2;
-	bool b3 = str < str2;
-	bool b4 = str <= str2;
+	EString str3;
+	str + str2;
+	str3 = str + str2;
 
 	auto scene = new EScene();
 	EApp::enterScene(scene);
diff --git a/Easy2D/Base/EApp.cpp b/Easy2D/Base/EApp.cpp
index 3c64439b..1647a675 100644
--- a/Easy2D/Base/EApp.cpp
+++ b/Easy2D/Base/EApp.cpp
@@ -341,6 +341,8 @@ void e2d::EApp::_update()
 			m_pTransition = nullptr;
 			// 进入下一场景
 			_enterNextScene();
+			// 刷新计时器
+			_updateTime();
 		}
 		return;
 	}
diff --git a/Easy2D/Common/EString.cpp b/Easy2D/Common/EString.cpp
index dc56ba42..ea29e761 100644
--- a/Easy2D/Common/EString.cpp
+++ b/Easy2D/Common/EString.cpp
@@ -9,6 +9,14 @@ EString::EString()
 	_string = nullptr;
 }
 
+e2d::EString::EString(const wchar_t ch)
+{
+	_size = 1;
+	_string = new wchar_t[2];
+	_string[0] = ch;
+	_string[1] = 0;
+}
+
 EString::EString(const wchar_t *str)
 {
 	if (str)
@@ -293,6 +301,26 @@ unsigned int e2d::EString::hash() const
 	return (hash);
 }
 
+EString e2d::operator+(const wchar_t ch, const EString &str)
+{
+	return std::move((EString(ch) + str));
+}
+
+EString e2d::operator+(const wchar_t *str1, const EString &str2)
+{
+	return std::move((EString(str1) + str2));
+}
+
+EString e2d::operator+(const EString &str1, const EString &str2)
+{
+	return std::move((EString(str1) + str2));
+}
+
+EString e2d::operator+(const std::wstring &str1, const EString &str2)
+{
+	return std::move((EString(str1) + str2));
+}
+
 std::wistream & e2d::operator>>(std::wistream &cin, EString &str)
 {
 	const int limit_string_size = 4096;
diff --git a/Easy2D/ecommon.h b/Easy2D/ecommon.h
index a5d9a5c9..4c3212df 100644
--- a/Easy2D/ecommon.h
+++ b/Easy2D/ecommon.h
@@ -134,6 +134,7 @@ class EString
 {
 public:
 	EString();
+	EString(const wchar_t);
 	EString(const wchar_t *);
 	EString(const EString &);
 	EString(const std::wstring &);
@@ -187,11 +188,21 @@ public:
 	bool operator > (EString const&) const;
 	bool operator >= (EString const&) const;
 
-	friend std::wistream &operator>>(std::wistream &, EString &);
-
 	operator const wchar_t*() const { return _string; }
 	operator bool() const { return _size != 0; }
 
+	friend EString operator+(const wchar_t, const EString &);
+	friend EString operator+(const wchar_t*, const EString &);
+	friend EString operator+(const EString &, const EString &);
+	friend EString operator+(const std::wstring &, const EString &);
+	template<typename T>
+	friend EString operator+(const T &value, const EString &str)
+	{
+		return std::move((EString::parse(value) + str2));
+	}
+
+	friend std::wistream &operator>>(std::wistream &, EString &);
+
 	// 判断字符串是否为空
 	bool isEmpty() const { return _size == 0; }
 
diff --git a/Easy2D/etools.h b/Easy2D/etools.h
index da2bf206..ea82c1e6 100644
--- a/Easy2D/etools.h
+++ b/Easy2D/etools.h
@@ -159,11 +159,11 @@ public:
 
 	/**
 	*  打开保存文件对话框，得到有效保存路径返回 true
-	*  参数：返回文件路径的字符串，窗口标题，设置扩展名过滤，设置默认扩展名
+	*  参数：窗口标题，默认扩展名
 	*/
 	static EString getSaveFilePath(
 		const EString & title = L"保存到",
-		const EString & defExt = NULL
+		const EString & defExt = L""
 	);
 };