diff --git a/problems/0242.有效的字母异位词.md b/problems/0242.有效的字母异位词.md
index 8aa0d171..0c75bbf9 100644
--- a/problems/0242.有效的字母异位词.md
+++ b/problems/0242.有效的字母异位词.md
@@ -143,17 +143,23 @@ func isAnagram(s string, t string) bool {
 javaScript:
 
 ```js
+/**
+ * @param {string} s
+ * @param {string} t
+ * @return {boolean}
+ */
 var isAnagram = function(s, t) {
-    const resSet = new Array(25).fill(0);
+    if(s.length !== t.length) return false;
+    const resSet = new Array(26).fill(0);
     const base = "a".charCodeAt();
     for(const i of s) {
         resSet[i.charCodeAt() - base]++;
     }
     for(const i of t) {
+        if(!resSet[i.charCodeAt() - base]) return false;
         resSet[i.charCodeAt() - base]--;
-        // if(val < 0) return false; 
     }
-    return resSet.every(i => !i);
+    return true;
 };
 ```
 
diff --git a/problems/0383.赎金信.md b/problems/0383.赎金信.md
index 7ff28601..755910f9 100644
--- a/problems/0383.赎金信.md
+++ b/problems/0383.赎金信.md
@@ -176,7 +176,7 @@ javaScript:
  * @return {boolean}
  */
 var canConstruct = function(ransomNote, magazine) {
-    const strArr = new Array(25).fill(0), 
+    const strArr = new Array(26).fill(0), 
         base = "a".charCodeAt();
     for(const s of magazine) {
         strArr[s.charCodeAt() - base]++;