diff --git a/src/leecode/javascript/12.整数转罗马数字.js b/src/leecode/javascript/12.整数转罗马数字.js
new file mode 100644
index 0000000..85e4826
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+++ b/src/leecode/javascript/12.整数转罗马数字.js
@@ -0,0 +1,42 @@
+/*
+ * @lc app=leetcode.cn id=12 lang=javascript
+ *
+ * [12] 整数转罗马数字
+ */
+
+// @lc code=start
+/**
+ * @param {number} num
+ * @return {string}
+ */
+var intToRoman = function (num) {
+  const dic = { '1000:1': 'M', '100:1': 'C', '100:5': 'D', '10:1': 'X', '10:5': 'L', '1:1': 'I', '1:5': 'V' };
+  let div = 1000,
+    has,
+    remain = num;
+  let ret = "";
+  while (remain != 0) {
+    has = Math.floor(remain / div);
+    remain = remain % div;
+    if (has == 0) {
+      //量级下调
+      div /= 10;
+      continue;
+    }
+    if (has < 4) {
+      ret += dic[`${div}:1`].repeat(has)
+    } else if (has == 4) {
+      ret += (dic[`${div}:1`] + dic[`${div}:5`]);
+    } else if (has < 9) {
+      ret += dic[`${div}:5`];
+      ret += dic[`${div}:1`].repeat(has - 5);
+    } else {
+      ret += (dic[`${div}:1`] + dic[`${div * 10}:1`]);
+    }
+    div /= 10;
+  }
+  return ret;
+};
+// console.log("a" + "c".repeat(3))
+console.log(intToRoman(1994));
+// @lc code=end