IE定位问题，求大神解题

Question

（360浏览器兼容模式下）有三个盒子，box1做了蒙蔽效果（position：fixed）；box2（position:absoulte）;box3(position:absolute;);

点击文字让蒙版出现，box2中的对应个box3显示；因为box3需要水平垂直居中；做了定位；需要给Box2添加宽高；但是给box2添加width和height均为100%是，box3显示之后就不会隐藏了；

<div>
<p class="modelStand1">
       文字1
    </p>
    <p class="modelStand2">
         文字2
    </p>    
</div>


<ul class="modeleImg">
    <li class="modelLi1" style="cursor:pointer;">
        <img class="modelLimg4" style="width: 800px; height: 290px;" src="" />
    </li>
    <li class="modelLi2" style="cursor:pointer;">
       <img class="modelLimg4" style="width: 800px; height: 290px;" src="" />
    </li>
</ul>

<script>function modelXyd(oneBox,twoBox,thereBox){
        var a="."+oneBox;
        var b="."+twoBox;
        var c="."+thereBox;
      $(a).on("click",function(e){
        $(".modeleImg").show();
        $(b).show();
        $(c).show();
        $(c).on("click",function(e){
             $("modeleImg").show();
              $(b).show();
             $(c).show();
            ;
          if(e && e.stoppropagation){
               e.stopPropagation();
        }else{
                window.event.cancelBubble=true;
                }
          });
         $(document).on("click",function(){
              $(".modeleImg").hide();
              $(b).hide();
             $(c).hide();
          });
            if(e && e.stoppropagation){
               e.stopPropagation();
        }else{
                window.event.cancelBubble=true;
                }
      })
      };
$(document).ready(function(){
  modelXyd("modelStand1","modelLi1","modelLimg1");
  modelXyd("modelStand2","modelLi2","modelLimg2");
  modelXyd("modelStand3","modelLi3","modelLimg3");
})</script>