diff --git a/src/main/webapp/resources/js/base/base.js b/src/main/webapp/resources/js/base/base.js
index 7b395a9..9127454 100644
--- a/src/main/webapp/resources/js/base/base.js
+++ b/src/main/webapp/resources/js/base/base.js
@@ -29,6 +29,29 @@ function trim(s) {
 	return s.replace(/^\s+/, "").replace(/\s+$/, "");
 }
 
+function strLength(str) {
+    let length = 0;
+    for (let i = 0; i < str.length; i++) {
+        let char = str.charCodeAt(i);
+        if (char <= 0x7F) {
+            length += 1;  // 영문, 숫자, 일부 특수문자
+        } else if (char <= 0x7FF) {
+            length += 2;
+        } else if (char <= 0xFFFF) {
+            length += 3;  // 한글, 한자 등
+        } else {
+            length += 4;  // 이모지 등
+        }
+    }
+    return length;
+}
+
+const rem = {
+	base: parseFloat(getComputedStyle(document.documentElement).fontSize),
+	toPx(r) {return r * rem.base + "px";},
+	fromPx(px) {return px / rem.base + "rem";}
+};
+
 function isEmpty(v) {
 	if (v == undefined
 	 || v == "undefined"