Merge pull request #1035 from xiaofei-2020/str4

添加（0151.翻转字符串里的单词.md）：增加typescript版本

problems/0151.翻转字符串里的单词.md

@@ -553,6 +553,65 @@ function reverse(strArr, start, end) {
 }
 ```
 
+TypeScript：
+
+```typescript
+function reverseWords(s: string): string {
+    /** Utils **/
+    // 删除多余空格, 如'   hello     world   ' => 'hello world'
+    function delExtraSpace(arr: string[]): void {
+        let left: number = 0,
+            right: number = 0,
+            length: number = arr.length;
+        while (right < length && arr[right] === ' ') {
+            right++;
+        }
+        while (right < length) {
+            if (arr[right] === ' ' && arr[right - 1] === ' ') {
+                right++;
+                continue;
+            }
+            arr[left++] = arr[right++];
+        }
+        if (arr[left - 1] === ' ') {
+            arr.length = left - 1;
+        } else {
+            arr.length = left;
+        }
+    }
+    // 翻转字符串，如：'hello' => 'olleh'
+    function reverseWords(strArr: string[], start: number, end: number) {
+        let temp: string;
+        while (start < end) {
+            temp = strArr[start];
+            strArr[start] = strArr[end];
+            strArr[end] = temp;
+            start++;
+            end--;
+        }
+    }
+
+    /** Main code **/
+    let strArr: string[] = s.split('');
+    delExtraSpace(strArr);
+    let length: number = strArr.length;
+    // 翻转整个字符串
+    reverseWords(strArr, 0, length - 1);
+    let start: number = 0,
+        end: number = 0;
+    while (start < length) {
+        end = start;
+        while (strArr[end] !== ' ' && end < length) {
+            end++;
+        }
+        // 翻转单个单词
+        reverseWords(strArr, start, end - 1);
+        start = end + 1;
+    }
+    return strArr.join('');
+};
+```
+
 Swift:
 
 ```swift