fix body no scroll

Author: jljsj33

package.json

@@ -1,6 +1,6 @@
 {
   "name": "rc-drawer",
-  "version": "2.0.2",
+  "version": "2.0.3",
   "description": "drawer component for react",
   "keywords": [
     "react",

src/DrawerChild.tsx

@@ -214,7 +214,9 @@ class DrawerChild extends React.Component<IDrawerChildProps, IState> {
   ) => {
     const { placement, levelMove, duration, ease, onChange, showMask } = this.props;
     if (!windowIsUndefined) {
-      const right = getScrollBarSize(true);// router 切换时可能会导至页面失去滚动条，所以需要时时获取。
+      const right = document.body.scrollHeight >
+        (window.innerHeight || document.documentElement.clientHeight) &&
+        window.innerWidth > document.body.offsetWidth ? getScrollBarSize(true) : 0;// router 切换时可能会导至页面失去滚动条，所以需要时时获取。
       this.levelDom.forEach(dom => {
         dom.style.transition = `transform ${duration} ${ease}`;
         addEventListener(dom, transitionEnd, this.transitionEnd);