js简单实现Select互换数据的方法

<title>两个Select互换数据，简单实用</title><script language="JavaScript">var MainSel = null;var SlaveSel = null;var Item_org = new Array();function DoAdd(){ var this_sel = null; for(var i=0;i<MainSel.options.length;i++){  this_sel = MainSel.options[i];  if(this_sel.selected){   SlaveSel.appendChild(this_sel);   i--;  } } sort_Main(SlaveSel);}function DoDel(){ var this_sel = null; for(var i=0;i<SlaveSel.options.length;i++){  this_sel = SlaveSel.options[i];  if(this_sel.selected){   MainSel.appendChild(this_sel);   i--;  } } sort_Main(MainSel);}function sort_Main(the_Sel){ var this_sel = null; for(var i=0;i<Item_org.length;i++){  for(var j=0;j<the_Sel.options.length;j++){   this_sel = the_Sel.options[j];   if(this_sel.value==Item_org[i][0] && this_sel.text==Item_org[i][1]){    the_Sel.appendChild(this_sel);   }  } }}window.onload=function(){ MainSel = select1; SlaveSel = select2; MainSel.ondblclick=DoAdd; SlaveSel.ondblclick=DoDel; var this_sel = null; for(var i=0;i<MainSel.options.length;i++){  this_sel = MainSel.options[i];  Item_org.push(new Array(this_sel.value,this_sel.text)); }}</script><table width="300" border="0" cellspacing="0" cellpDoAdding="0" align="center"> <tr> <td width="45%" align="center"> <select id="select1" size="5" multiple style="width: 100px">  <option value="111">111</option>  <option value="222">222</option>  <option value="333">333</option>  <option value="444">444</option>  <option value="555">555</option>  <option value="666">666</option>  </select>  </td> <td width="10%" align="center"> <input name="DoAdd" type="button" value=">>" onClick="DoAdd()"><br> <input name="DoDel" type="button" value="<<" onClick="DoDel()"> </td> <td width="45%" align="center"> <select id="select2" size="5" multiple style="width: 100px"> </select> </td> </tr></table>