谁帮我看看这段代码

Question

              <script language="Javascript">
                     function onClick(obj)
                 {   
                     disDiv=document.getElementById("d"+obj);
                     var i=0;pos=-1;
                 for(;i<4;i++)
                     {
                      if(document.getElementById("d"+i).style.display=="block")
                         pos=i;
                         document.getElementById("d"+i).style.display="none";
                     }
                     if (pos==obj)
                         disDiv.style.display="none";
                     else
                         disDiv.style.display="block";
                 }
                 </script>
总共4个div id分别为d0 d1 d2 d3 而且style=“display：none” onClick=“expand（）”
这段js代码哪里出现问题了

Answer 1

onClick=“expand（）” 什么意思？onclick="onClick(0)"

Answer 2

修改div onclick="expand(this)" 
函数名改为function expand(obj)