Merge pull request #1021 from xiaofei-2020/hash7

添加（0383.赎金信.md）：增加typescript版本

problems/0383.赎金信.md

@@ -264,6 +264,27 @@ var canConstruct = function(ransomNote, magazine) {
 };
 ```
 
+TypeScript:
+
+```typescript
+function canConstruct(ransomNote: string, magazine: string): boolean {
+    let helperArr: number[] = new Array(26).fill(0);
+    let base: number = 'a'.charCodeAt(0);
+    let index: number;
+    for (let i = 0, length = magazine.length; i < length; i++) {
+        helperArr[magazine[i].charCodeAt(0) - base]++;
+    }
+    for (let i = 0, length = ransomNote.length; i < length; i++) {
+        index = ransomNote[i].charCodeAt(0) - base;
+        helperArr[index]--;
+        if (helperArr[index] < 0) {
+            return false;
+        }
+    }
+    return true;
+};
+```
+
 
 PHP:
 ```php