diff --git a/src/leecode/javascript/58.最后一个单词的长度.js b/src/leecode/javascript/58.最后一个单词的长度.js
new file mode 100644
index 0000000..720187e
--- /dev/null
+++ b/src/leecode/javascript/58.最后一个单词的长度.js
@@ -0,0 +1,29 @@
+/*
+ * @lc app=leetcode.cn id=58 lang=javascript
+ *
+ * [58] 最后一个单词的长度
+ */
+
+// @lc code=start
+/**
+ * @param {string} s
+ * @return {number}
+ */
+var lengthOfLastWord = function (s) {
+  let index = s.length - 1;
+  let result = 0;
+  let first = false;
+  while (index >= 0) {
+    if (s[index] == " ") {
+      if (first) {
+        return result;
+      }
+    } else {
+      first = true;
+      result++;
+    }
+    index--;
+  }
+  return result;
+};
+// @lc code=end