diff --git a/src/web/module/home_section.html b/src/web/module/home_section.html
index eaa5cd4..6022629 100644
--- a/src/web/module/home_section.html
+++ b/src/web/module/home_section.html
@@ -5,7 +5,7 @@ function loadMaestroExperienceAccount() {
 		"./../server/maestro/maestro_experience_account.php",
 		"",
 
-		(jsonData) => {
+		(function(jsonData) {
 			let maestroID = jsonData["maestroID"];
 			let playerID = jsonData["playerID"];
 			let playerName = jsonData["playerName"];
@@ -19,11 +19,11 @@ function loadMaestroExperienceAccount() {
 			sessionStorage.setItem("playerName", playerName);
 
 			location.href = "./../maestro/main_menu.html";
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			showErrorMessage(errorMessage, "error");
-		}
+		})
 
 	);
 	let xhr = new XMLHttpRequest(); //new로 생성.
diff --git a/src/web/module/maestro_header.html b/src/web/module/maestro_header.html
index 93b87ac..54b65f9 100644
--- a/src/web/module/maestro_header.html
+++ b/src/web/module/maestro_header.html
@@ -5,18 +5,18 @@ function loadMaestroTestAccountInfo() {
 		"./../server/maestro/maestro_test_player.php",
 		"maestro_id=" + maestroID,
 
-		(jsonData) => {
+		(function(jsonData) {
 			// console.log("playerID : " + jsonData["playerID"]);
 			// console.log("playerName : " + jsonData["playerName"]);
 			sessionStorage.setItem("playerID", jsonData["playerID"]);
 			sessionStorage.setItem("playerName", jsonData["playerName"]);
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			if($("#error_message").length) {
 				$("#error_message").text(errorMessage);
 			}
-		}
+		})
 
 	);
 }
@@ -33,15 +33,15 @@ function deleteMaestroAllRecords() {
 			"./../server/maestro/delete_test_player_record.php",
 			"maestro_id=" + maestroID,
 
-			(jsonData) => {
+			(function(jsonData) {
 				alert("마에스트로 전용 계정의 모든 플레이 기록이 지워졌습니다.");
-			},
+			}),
 
-			(errorMessage, errorCode) => {
+			(function(errorMessage, errorCode) {
 				if($("#error_message").length) {
 					$("#error_message").text(errorMessage);
 				}
-			}
+			})
 
 		);
 	} else {
diff --git a/src/web/module/maestro_section_add_player.html b/src/web/module/maestro_section_add_player.html
index e16540b..1683a88 100644
--- a/src/web/module/maestro_section_add_player.html
+++ b/src/web/module/maestro_section_add_player.html
@@ -42,16 +42,16 @@ function addPlayer() {
 		"./../server/player/add_player.php",
 		"maestro_id=" + maestroID + "&player_name=" + playerName + "&enter_code=" + enterCode,
 
-		(jsonData) => {
+		(function(jsonData) {
 			showErrorMessage(playerName + " : 학생 데이터가 추가되었습니다", "success");
 			addPlayerListManager.updateAddPlayerListPage(1);
 
 			onChangePlayerCount();
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			showErrorMessage(errorMessage, "error");
-		}
+		})
 
 	);
 }
diff --git a/src/web/module/maestro_section_login.html b/src/web/module/maestro_section_login.html
index 4782490..b219fa6 100644
--- a/src/web/module/maestro_section_login.html
+++ b/src/web/module/maestro_section_login.html
@@ -27,14 +27,14 @@ function login() {
 		"./../server/maestro/login.php",
 		"maestro_name=" + name + "&password=" + password,
 
-		(jsonData) => {
+		(function(jsonData) {
 			sessionStorage.setItem("maestroID", jsonData["maestroID"]);
 			sessionStorage.setItem("maestroAccountType", jsonData["maestroAccountType"]);
 
 			location.href = './../maestro/main_menu.html';
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			console.log("errorCode : " + errorCode);
 
 			let errorType = "error";
@@ -51,7 +51,7 @@ function login() {
 			}
 
 			showErrorMessage(errorMessage, errorType);
-		}
+		})
 
 	);
 }
diff --git a/src/web/module/maestro_section_mouse_app.html b/src/web/module/maestro_section_mouse_app.html
index 24fcfca..d417f41 100644
--- a/src/web/module/maestro_section_mouse_app.html
+++ b/src/web/module/maestro_section_mouse_app.html
@@ -11,14 +11,14 @@ function loadMouseApp() {
 		"./../server/app/mouse_app_list.php",
 		"maestro_id=" + maestroID,
 
-		(jsonData) => {
+		(function(jsonData) {
 			makeMouseAppList(jsonData["appList"]);
 			activateMouseApp(jsonData["activatedAppList"]);
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			showErrorMessage(errorMessage, "error");
-		}
+		})
 
 	);
 }
@@ -71,14 +71,14 @@ function activateApp(appID) {
 		"./../server/app/activate_app.php",
 		"maestro_id=" + maestroID + "&app_id=" + appID,
 
-		(jsonData) => {
+		(function(jsonData) {
 			// console.log(jsonData);
 			showErrorMessage("[ " + jsonData["koreanName"] + "] 앱이 메뉴에 추가되었습니다. (위의 [마에스트로 앱 실행] 버튼을 눌러 확인해보세요)", "success");
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			showErrorMessage(errorMessage, "error");
-		}
+		})
 
 	);
 }
@@ -88,14 +88,14 @@ function deactivateApp(appID) {
 		"./../server/app/deactivate_app.php",
 		"maestro_id=" + maestroID + "&app_id=" + appID,
 
-		(jsonData) => {
+		(function(jsonData) {
 			// console.log(jsonData);
 			showErrorMessage("[ " + jsonData["koreanName"] + "] 앱이 메뉴에서 삭제되었습니다. (위의 [마에스트로 앱 실행] 버튼을 눌러 확인해보세요)", "danger");
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			showErrorMessage(errorMessage, "error");
-		}
+		})
 
 	);
 }
diff --git a/src/web/module/maestro_section_register.html b/src/web/module/maestro_section_register.html
index 2416651..770bae5 100644
--- a/src/web/module/maestro_section_register.html
+++ b/src/web/module/maestro_section_register.html
@@ -46,18 +46,18 @@ function checkMaestroID() {
 		"./../server/maestro/check_id.php",
 		"maestro_name=" + maestroName,
 
-		(jsonData) => {
+		(function(jsonData) {
 			isAvailableID = true;
 			let message = maestroName + " : 새로 등록할 수 있는 마에스트로 아이디입니다.";
 			showErrorMessage(message, "success");
 
 			// $("#password").focus();
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			isAvailableID = false;
 			onErrorMaestroID(errorMessage);
-		}
+		})
 
 	);
 }
@@ -181,11 +181,11 @@ function register_account() {
 		"./../server/maestro/add_maestro.php",
 		"maestro_name=" + maestroName + "&password=" + password + "&email=" + email + "&account_type=" + selectedAccountTypeValue,
 
-		(jsonData) => {
+		(function(jsonData) {
 			isAvailableID = true;
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			isAvailableID = false;
 
 			if($("#error_message").length) {
@@ -194,7 +194,7 @@ function register_account() {
 
 			$("#maestro_name").val("");
 			$("#maestro_name").focus();
-		}
+		})
 
 	);
 }
diff --git a/src/web/module/maestro_section_typing_app.html b/src/web/module/maestro_section_typing_app.html
index b1b53b7..d7de80a 100644
--- a/src/web/module/maestro_section_typing_app.html
+++ b/src/web/module/maestro_section_typing_app.html
@@ -11,14 +11,14 @@ function loadTypingApp() {
 		"./../server/app/typing_app_list.php",
 		"maestro_id=" + maestroID,
 
-		(jsonData) => {
+		(function(jsonData) {
 			makeTypingAppList(jsonData["appList"]);
 			activateTypingApp(jsonData["activatedAppList"]);
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			showErrorMessage(errorMessage, "error");
-		}
+		})
 
 	);
 }
diff --git a/src/web/module/maestro_setup.html b/src/web/module/maestro_setup.html
index 9609707..fe2823f 100644
--- a/src/web/module/maestro_setup.html
+++ b/src/web/module/maestro_setup.html
@@ -27,7 +27,7 @@ function loadMaestroInfo(maestroID) {
 		"./../server/maestro/maestro_info.php",
 		"maestro_id=" + maestroID,
 
-		(jsonData) => {
+		(function(jsonData) {
 			console.log(jsonData);
 			registeredMaestroIDName = jsonData.name;
 			$("#maestro_id").val(registeredMaestroIDName);
@@ -36,11 +36,11 @@ function loadMaestroInfo(maestroID) {
 			$("#email").val(registeredEmail);
 
 			registeredAccountType = jsonData.accountType;
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			showErrorMessage(errorMessage, "error");
-		}
+		})
 
 	);
 }
@@ -66,22 +66,22 @@ function checkMaestroIDName() {
 		"./../server/maestro/check_id.php",
 		"maestro_name=" + newMaestroIDName,
 
-		(jsonData) => {
+		(function(jsonData) {
 			isAvailableIDName = true;
 			isChangedIDName = false;
 			showErrorMessage(newMaestroIDName + " : 새로 등록할 수 있는 마에스트로 아이디입니다.", "success");
 
 			$("#id_ckeck").prop("disabled", true)
 			$("#id_ckeck_help").addClass("d-none");
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			isAvailableIDName = false;
 			showErrorMessage(errorMessage, "error");
 			// $("#maestro_name").val("");
 			$("#maestro_id").focus();
 			$("#maestro_id").select();
-		}
+		})
 
 	);
 }
@@ -119,19 +119,19 @@ function changeMaestroInfo() {
 		"./../server/maestro/update_maestro_info.php",
 		"maestro_id=" + maestroID + "&maestro_name=" + newMaestroIDName + "&email=" + newEmail,
 
-		(jsonData) => {
+		(function(jsonData) {
 			alert(
 				"마에스트로 계정 정보가 변경되었습니다.\n"
 				+ "아이디 : " + newMaestroIDName + "\n"
 				+ "이메일 : " + newEmail
 			);
 			location.href="main_menu.html";
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			isAvailableIDName = false;
 			showErrorMessage(errorMessage);
-		}
+		})
 
 	);
 }
@@ -192,14 +192,14 @@ function changeMaestroPassword() {
 		"./../server/maestro/update_maestro_password.php",
 		"maestro_id=" + maestroID + "&registered_pw=" + registeredPassword + "&new_pw=" + newPassword,
 
-		(jsonData) => {
+		(function(jsonData) {
 			alert("패스워드가 변경되었습니다.");
 			location.href="main_menu.html";
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			showErrorMessage(errorMessage);
-		}
+		})
 
 	);
 
diff --git a/src/web/module/maestro_upgrade.html b/src/web/module/maestro_upgrade.html
index 1dbed53..6953dc7 100644
--- a/src/web/module/maestro_upgrade.html
+++ b/src/web/module/maestro_upgrade.html
@@ -12,15 +12,15 @@ function loadMaestroInfo(maestroID) {
 		"./../server/maestro/maestro_info.php",
 		"maestro_id=" + maestroID,
 
-		(jsonData) => {
+		(function(jsonData) {
 			// console.log(jsonData);
 			registeredAccountType = jsonData.accountType;
 			updateCards(registeredAccountType);
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			showErrorMessage(errorMessage, "error");
-		}
+		})
 
 	);
 }
@@ -124,15 +124,15 @@ function upgradeMaestroInfo(accountType) {
 		"./../server/maestro/request_upgrade_maestro.php",
 		"maestro_id=" + maestroID + "&registered_account_type=" + registeredAccountType + "&new_account_type=" + newAccountType,
 
-		(jsonData) => {
+		(function(jsonData) {
 			// console.log(jsonData);
 			alert("업그레이드 요청이 등록되었습니다.");
 			location.href="main_menu.html";
-		},
+		}),
 
-		(errorMessage, errorCode) => {
+		(function(errorMessage, errorCode) {
 			showErrorMessage(errorMessage, "error");
-		}
+		})
 
 	);