<script language="javascript">
function doClick(){
for(var i=0;i<document.all.length;i++)
alert(document.all[i].id);
}</script><input type="button" onclick="doClick()" value="dianji">
function doClick(){
for(var i=0;i<document.all.length;i++)
alert(document.all[i].id);
}</script><input type="button" onclick="doClick()" value="dianji">
for (var i=0;i<nLen;i++)
{
var oObj = document.body.all(i);
alert(oObj.tagName);
}
{
alert(document.all[i])
}