querySelector不适用于IE 9

Question

我想崩溃展开左页面功能在我的页面有左和右导航面板。左侧面板折叠，但未设置新的容器类。该结构是这样的：

<div class="contentContainer"> 

    <div class="leftNavPanel"> 
     <div> 

     </div> 
    </div> 


    <div class="openClose" id="openClose"> 
     <div class="leftPanelClose"> 
      <a class="expandCollapseAnchor" href="javascript:collapseExpand()"><i class="fa fa-angle-double-left" id="expandCollapseIcon"></i></a>  
     </div> 

    </div> 

    <div class="rightNavPanel"> 
     <div> 

     </div> 
    </div> 

    <div class="clearBoth"></div> 

</div> 

我的JavaScript看起来是这样的：

function collapseExpand(){ 

var left = document.querySelector("div.leftNavPanel"); 
var oc = document.querySelector("div.openClose"); 
var rP = document.querySelector("div.rightNavPanel"); 
var cont = document.querySelector(".contentContainer, .contentContainerNoLeftNavPanel"); 
var ic = document.getElementById("expandCollapseIcon"); 

if (left.style.display!="none") 
{ 
left.style.display="none"; 
oc.style.marginLeft="0px"; 
rP.style.marginLeft="20px"; 
cont.classList.add("contentContainerNoLeftNavPanel"); 
cont.classList.remove("contentContainer"); 
ic.classList.remove("fa-angle-double-left"); 
ic.classList.add("fa-angle-double-right"); 
} 
else 
{ 
left.style.display="block"; 
oc.style.marginLeft="290px"; 
rP.style.marginLeft="310px"; 
cont.classList.add("contentContainer"); 
cont.classList.remove("contentContainerNoLeftNavPanel"); 
ic.classList.remove("fa-angle-double-right"); 
ic.classList.add("fa-angle-double-left"); 
} 

} 

唯一的问题是，querySelector不接受两个类名称为至少旧的浏览器（< = IE9）参数这就是我认为的问题所在。有人能告诉我这里发生了什么吗？这似乎很好地工作与最新的Chrome和IE>版本9

Answer 1

我猜你的问题是cont.classListnot being supported by IE9 or older