吐血看不懂-纯javascript作的左右列表内容互换
<select   name= "availableActivity "
              ondblclick= "move(availableActivity,selectedActivity) "  
              multiple= "true ">
</select>
<select   name= "selectedActivity "
ondblclick= "move(selectedActivity,availableActivity) "  
                    multiple= "true ">
</select>

function   move(fbox,tbox)
{
 
var   i;  
var   arrFbox   =   new   Array();
var   arrTbox   =   new   Array();
var   arrLookup   =   new   Array();

for(i=0;i <tbox.options.length;i++)
{    
arrLookup[tbox.options[i].text]   =   tbox.options[i].value;
arrTbox[i]   =   tbox.options[i].text;
}
var   fLength   =0;
var   tLength   =   arrTbox.length;

for(i=0;i <fbox.options.length;i++)
{
  alert( "gg2 ");
arrLookup[fbox.options[i].text]   =   fbox.options[i].value;
if(fbox.options[i].selected)
{
arrTbox[tLength]   =   fbox.options[i].text;
tLength++;
}
else
{
arrFbox[fLength]   =   fbox.options[i].text;
fLength++;
}
}

fbox.length   =   0;
tbox.length   =   0;
var   c;

for(c=0;c <arrFbox.length;c++)
{
var   no   =   new   Option();
no.value   =   arrLookup[arrFbox[c]];
no.text   =   arrFbox[c];
fbox[c]   =   no;
}
for(c=0;c <arrTbox.length;c++)
{
var   no   =   new   Option();
no.value   =   arrLookup[arrTbox[c]];
no.text   =   arrTbox[c];
tbox[c]   =   no;
}
}
2个select有些数据，双击一个select数据，这条数据就跑到另外个select里
函数完全看不懂，那位大哥能帮着解释下？从arrLookup[tbox.options[i].text]   =   tbox.options[i].value;
这行大脑就乱飞了

------解决方案--------------------
要用的时候再看
平时学基础