fix button scroll

Author: jljsj33

package.json

@@ -1,6 +1,6 @@
 {
   "name": "rc-drawer-menu",
-  "version": "0.3.1",
+  "version": "0.3.2",
   "description": "drawer menu animation component for react",
   "keywords": [
     "react",

src/Drawer.jsx

@@ -153,9 +153,19 @@ class Drawer extends React.PureComponent {
     return doms[doms.length - 1];
   }
 
+  getIsButtonDom = (dom) => {
+    if (dom.className === `${this.props.className}-button`) {
+      return true;
+    }
+    if (dom.parentNode) {
+      return this.getIsButtonDom(dom.parentNode);
+    }
+    return false;
+  }
+
   removeScroll = (e) => {
     const dom = e.target;
-    if (dom.className === `${this.props.className}-bg`) {
+    if (dom.className === `${this.props.className}-bg` || this.getIsButtonDom(dom)) {
       e.preventDefault();
       e.returnValue = false;
       return;