Merge branch 'problems' into dev

src/components/problems/index.js

@@ -96,7 +96,7 @@ class Problems extends Component {
               }
               {
                 isShowAnswer &&
-                <div className={`content ${isShowAnswer ? 'slideInDown' : ''}`}>
+                <div className={`content`}>
                   <div className={'title'}>解析</div>
                   <span dangerouslySetInnerHTML={{__html: quesInfo.analysis}}></span>
                 </div>
@@ -105,10 +105,10 @@ class Problems extends Component {
                 <div className="app">更多题目请 <CallApp text={'前往APP'}/></div>
                 <div className="op">
                   {
-                    between && !!between.up && <Link to={`/problems/${between.up}`} className={'nav'}>上一题</Link>
+                    between && !!between.up && <Link to={`/problems/${between.up}`} replace className={'nav'}>上一题</Link>
                   }
                   {
-                    between && !!between.down && <Link to={`/problems/${between.down}`} className={'nav'}>下一题</Link>
+                    between && !!between.down && <Link to={`/problems/${between.down}`} replace className={'nav'}>下一题</Link>
                   }
                 </div>
               </footer>