diff --git a/common/js/lang.js b/common/js/lang.js
index 0b08be8..511113c 100644
--- a/common/js/lang.js
+++ b/common/js/lang.js
@@ -542,8 +542,13 @@ export default {
 			// ------- 优化2: 字段解析结果缓存(命中直接返回) -------
 			const fieldCacheKey = `${locale}__${langPath}__${_overrideVersion}__${field}`;
 			const cachedFieldResult = _fieldResultCache[fieldCacheKey];
+			const hasDefault = arguments.length > 1 && typeof arguments[1] === 'string' && arguments[1] !== '';
 			if (cachedFieldResult !== undefined) {
 				let value = cachedFieldResult;
+				// 没找到翻译且提供了默认值 → 使用默认值
+				if (value === field && hasDefault) {
+					return arguments[1];
+				}
 				// 带参数的翻译(如 hello {0})需要在缓存后仍做参数替换
 				if (arguments.length > 1) {
 					for (let i = 1; i < arguments.length; i++) {
@@ -599,8 +604,11 @@ export default {
 			// 将结果存入字段缓存(不含参数替换部分:参数每次可能不同)
 			_fieldResultCache[fieldCacheKey] = value;
 
-			// 带参数的翻译
-			if (arguments.length > 1) {
+			// 没找到翻译且提供了默认值 → 使用默认值
+			if (value === field && hasDefault) {
+				value = arguments[1];
+			} else if (arguments.length > 1) {
+				// 带参数的翻译
 				for (let i = 1; i < arguments.length; i++) {
 					value = String(value).replace("{" + (i - 1) + "}", arguments[i]);
 				}
diff --git a/pages_tool/member/public/js/member-public.js b/pages_tool/member/public/js/member-public.js
index 8dbdd97..3bd4ae5 100644
--- a/pages_tool/member/public/js/member-public.js
+++ b/pages_tool/member/public/js/member-public.js
@@ -12,8 +12,8 @@ export default {
 		// 退出登录
 		logout() {
 			uni.showModal({
-				title: this.$lang ? this.$lang('logoutTitle') : '提示',
-				content: this.$lang ? this.$lang('logoutContent') : '确定要退出登录吗',
+				title: this.$lang('logoutTitle', '提示'),
+				content: this.$lang('logoutContent',  '确定要退出登录吗'),
 				success: (res) => {
 					if (res.confirm) {
 						this.clearLoginState();