.net当中用Javascript给LI标签设置样式

Question

用<ul>和<li>作了一个菜单，当选择一个菜单后，希望改变该菜单样式，直到选择其他菜单后，该菜单的样式才还原。 请问用JS该怎么写,会的回答一下,不会的也顶一下,不然一会就沉了,拜上!

Answer 1

 function commodity()
    {   
         var ul=document.getElementById("muen");
         var li =ul.getElementsByTagName("li");
         for(var i=0;i<li.length;i++)
         {
               li[i].onmousemove=function()
               {
           var div=document.getElementById ("divcalss").getElementsByTagName("div");
           var li1=document.getElementById("muen").getElementsByTagName("li");
                      
                      for(var i=0;i<li1.length;i++ )
                      {
                                 if(li1[i]==this)
                                 {
                                    li1[i].style.background="red";
                                   div[i].style.display="";
                                 }
                                 else{
                                   li1[i].style.background="white";
                                   div[i].style.display="none";
                                 }
                      
                      }
  
               } 
         }
    }
  
 </script>
 <div  style="width:100%" >
            <ul id="muen" >
             <li>书籍印品推荐</li>
             <li>简单印品推荐</li>
          </ul>
         </div>
    <div id="divcalss" style=" border-top:10px">
          <div>
              123
          </div>
          <div>
                456
          </div>
     </div>