diff --git a/problems/0704.二分查找.md b/problems/0704.二分查找.md
index 689c0633..cc7d7de5 100644
--- a/problems/0704.二分查找.md
+++ b/problems/0704.二分查找.md
@@ -326,6 +326,46 @@ var search = function(nums, target) {
 };
 ```
 
+**TypeScript**
+
+（版本一）左闭右闭区间
+
+```typescript
+function search(nums: number[], target: number): number {
+    let left: number = 0, right: number = nums.length - 1;
+    while (left <= right) {
+        let mid: number = left + Math.floor((right - left) / 2);
+        if (nums[mid] > target) {
+            right = mid - 1;
+        } else if (nums[mid] < target) {
+            left = mid + 1;
+        } else {
+            return mid;
+        }
+    }
+    return -1;
+};
+```
+
+（版本二）左闭右开区间
+
+```typescript
+function search(nums: number[], target: number): number {
+    let left: number = 0, right: number = nums.length;
+    while (left < right) {
+        let mid: number = left + Math.floor((right - left) / 2);
+        if (nums[mid] > target) {
+            right = mid;
+        } else if (nums[mid] < target) {
+            left = mid + 1;
+        } else {
+            return mid;
+        }
+    }
+    return -1;
+};
+```
+
 **Ruby:**
 
 ```ruby