Update 1221.分割平衡字符串.md about TypeScript

problems/1221.分割平衡字符串.md

@@ -156,6 +156,21 @@ var balancedStringSplit = function(s) {
 };
 ```
 
+### TypeScript
+
+```ts
+function balancedStringSplit(s: string): number {
+    let count: number = 0
+    let res: number = 0
+    for(let i of s){
+        if(i === 'R') count++
+        else count--
+        if(count === 0) res++
+    }
+
+    return res
+};
+```
 
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