Merge pull request youngyangyang04#1015 from xiaofei-2020/hash3

添加（0349.两个数组的交集.md）：增加typescript版本

Author: youngyangyang04

problems/0349.两个数组的交集.md

@@ -190,7 +190,33 @@ var intersection = function(nums1, nums2) {
 };
 ```
 
+TypeScript:
+
+版本一（正常解法）：
+
+```typescript
+function intersection(nums1: number[], nums2: number[]): number[] {
+    let resSet: Set<number> = new Set(),
+        nums1Set: Set<number> = new Set(nums1);
+    for (let i of nums2) {
+        if (nums1Set.has(i)) {
+            resSet.add(i);
+        }
+    }
+    return Array.from(resSet);
+};
+```
+
+版本二（秀操作）：
+
+```typescript
+function intersection(nums1: number[], nums2: number[]): number[] {
+    return Array.from(new Set(nums1.filter(i => nums2.includes(i))))
+};
+```
+
 Swift：
+
 ```swift
 func intersection(_ nums1: [Int], _ nums2: [Int]) -> [Int] {
     var set1 = Set<Int>()