添加383. 赎金信JavaScript版本

problems/0383.赎金信.md

@@ -136,7 +136,7 @@ class Solution {
 ```
 
 Python：
-```
+```py
 class Solution(object):
     def canConstruct(self, ransomNote, magazine):
         """
@@ -167,6 +167,28 @@ class Solution(object):
 
 Go：
 
+javaScript:
+
+```js
+/**
+ * @param {string} ransomNote
+ * @param {string} magazine
+ * @return {boolean}
+ */
+var canConstruct = function(ransomNote, magazine) {
+    const strArr = new Array(25).fill(0), 
+        base = "a".charCodeAt();
+    for(const s of magazine) {
+        strArr[s.charCodeAt() - base]++;
+    }
+    for(const s of ransomNote) {
+        const index = s.charCodeAt() - base;
+        if(!strArr[index]) return false;
+        strArr[index]--;
+    }
+    return true;
+};
+```