添加文档说明。

README.md

@@ -5,7 +5,7 @@
 
 ### SendMessage/PostMessage
 + 移动鼠标：
-    ```cpp
+    ```javascript
     SendMessage(hwnd, WM_MOUSEMOVE, MK_LBUTTON, MAKELPARAM(x, y));
     ```
     + SendMessage(hwnd, WM_MOUSEMOVE, MK_LBUTTON, MAKELPARAM(x, y));