关于滑块条的问题

问大家个问题，我在实现上下滑动，我给我的div设置了overflow:auto这个属性,外面还套着一层div，这种情况下，只能用鼠标滚轮才能够正常上下拉，触摸上下拉是不行的，如果我外面没有套div的话，这些就是正常的，请问这个问题应该怎么解决

<div id="chat_" class="mui-popover mui-active" style="position: fixed; left: 5%; top: 6%; width: 90%; height: 90%; display: block;">  
            <div id="chat" style="text-align:center;indicators: true;" class="container scrollWrap"><div style="height:400px;overflow:auto;indicators: true;"><div class="msg msg-item" index="0" msg-type="text" msg-content="你好小猫猫!" tag="aaa"><img class="portrait msg-user-left" src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1596207959,384027956&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-left mui-ellipsis">老鼠爱上猫</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小猫猫!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item msg-item-self" index="1" msg-type="text" msg-content="你好小老鼠!" tag="aaa"><img class="portrait msg-user-right" src="https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3184040087,2141402221&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-right mui-ellipsis">猫爱上老鼠</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小老鼠!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item" index="2" msg-type="text" msg-content="你好小猫猫!" tag="aaa"><img class="portrait msg-user-left" src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1596207959,384027956&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-left mui-ellipsis">老鼠爱上猫</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小猫猫!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item msg-item-self" index="3" msg-type="text" msg-content="你好小老鼠!" tag="aaa"><img class="portrait msg-user-right" src="https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3184040087,2141402221&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-right mui-ellipsis">猫爱上老鼠</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小老鼠!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item" index="4" msg-type="text" msg-content="你好小猫猫!" tag="aaa"><img class="portrait msg-user-left" src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1596207959,384027956&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-left mui-ellipsis">老鼠爱上猫</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小猫猫!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item msg-item-self" index="5" msg-type="text" msg-content="你好小老鼠!" tag="aaa"><img class="portrait msg-user-right" src="https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3184040087,2141402221&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-right mui-ellipsis">猫爱上老鼠</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小老鼠!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item" index="6" msg-type="text" msg-content="你好小猫猫!" tag="aaa"><img class="portrait msg-user-left" src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1596207959,384027956&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-left mui-ellipsis">老鼠爱上猫</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小猫猫!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item msg-item-self" index="7" msg-type="text" msg-content="你好小老鼠!" tag="aaa"><img class="portrait msg-user-right" src="https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3184040087,2141402221&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-right mui-ellipsis">猫爱上老鼠</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小老鼠!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item" index="8" msg-type="text" msg-content="你好小猫猫!" tag="aaa"><img class="portrait msg-user-left" src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1596207959,384027956&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-left mui-ellipsis">老鼠爱上猫</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小猫猫!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item msg-item-self" index="9" msg-type="text" msg-content="你好小老鼠!" tag="aaa"><img class="portrait msg-user-right" src="https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3184040087,2141402221&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-right mui-ellipsis">猫爱上老鼠</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小老鼠!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item" index="10" msg-type="text" msg-content="你好小猫猫!" tag="aaa"><img class="portrait msg-user-left" src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1596207959,384027956&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-left mui-ellipsis">老鼠爱上猫</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小猫猫!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item msg-item-self" index="11" msg-type="text" msg-content="你好小老鼠!" tag="aaa"><img class="portrait msg-user-right" src="https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3184040087,2141402221&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-right mui-ellipsis">猫爱上老鼠</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小老鼠!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item" index="12" msg-type="text" msg-content="你好小猫猫!" tag="aaa"><img class="portrait msg-user-left" src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1596207959,384027956&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-left mui-ellipsis">老鼠爱上猫</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小猫猫!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item msg-item-self" index="13" msg-type="text" msg-content="你好小老鼠!" tag="aaa"><img class="portrait msg-user-right" src="https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3184040087,2141402221&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-right mui-ellipsis">猫爱上老鼠</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小老鼠!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item" index="14" msg-type="text" msg-content="你好小猫猫!" tag="aaa"><img class="portrait msg-user-left" src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1596207959,384027956&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-left mui-ellipsis">老鼠爱上猫</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小猫猫!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item msg-item-self" index="15" msg-type="text" msg-content="你好小老鼠!" tag="aaa"><img class="portrait msg-user-right" src="https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3184040087,2141402221&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-right mui-ellipsis">猫爱上老鼠</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小老鼠!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item" index="16" msg-type="text" msg-content="你好小猫猫!" tag="aaa"><img class="portrait msg-user-left" src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1596207959,384027956&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-left mui-ellipsis">老鼠爱上猫</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小猫猫!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item msg-item-self" index="17" msg-type="text" msg-content="你好小老鼠!" tag="aaa"><img class="portrait msg-user-right" src="https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3184040087,2141402221&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-right mui-ellipsis">猫爱上老鼠</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小老鼠!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item" index="18" msg-type="text" msg-content="你好小猫猫!" tag="aaa"><img class="portrait msg-user-left" src="https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=1596207959,384027956&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-left mui-ellipsis">老鼠爱上猫</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小猫猫!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div><div class="msg msg-item msg-item-self" index="19" msg-type="text" msg-content="你好小老鼠!" tag="aaa"><img class="portrait msg-user-right" src="https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3184040087,2141402221&amp;fm=26&amp;gp=0.jpg">  
<label class="nick-right mui-ellipsis">猫爱上老鼠</label>  
<br>  
<div class="msg-content">  
    <div class="msg-content-inner">你好小老鼠!</div>  
    <div class="msg-content-arrow"></div>  
</div>  
<div class="mui-item-clear"></div></div></div></div>  
        </div>