querySelector不適用於IE 9

Question

我想崩潰展開左頁面功能在我的頁面有左和右導航面板。左側面板摺疊，但未設置新的容器類。該結構是這樣的：

<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看起來是這樣的：

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"); 
} 

} 

唯一的問題是，querySelector不接受兩個類名稱爲至少舊的瀏覽器（< = IE9）參數這就是我認爲的問題所在。有人能告訴我這裏發生了什麼嗎？這似乎很好地工作與最新的Chrome和IE>版本9

Answer 1

我猜你的問題是cont.classListnot being supported by IE9 or older