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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title> 无标题文档</title>
<script type="text/javascript">
function clickEvt(obj){
var before = 0;
while(obj){
if(obj.type == "button")before ++;
obj = obj.previousSibling;
}
alert(before);
}
</script>
</head>
<body>
<input type="button" name="tname" value="OK" onclick="clickEvt(this)">
<input type="button" name="tname" value="OK" onclick="clickEvt(this)">
<input type="button" name="tname" value="OK" onclick="clickEvt(this)">
<input type="button" name="tname" value="OK" onclick="clickEvt(this)">
</body>
<input type="button" name="tname" value="OK" onclick="fn(this)">
<input type="button" name="tname" value="OK" onclick="fn(this)">
<input type="button" name="tname" value="OK" onclick="fn(this)">
<input type="button" name="tname" value="OK" onclick="fn(this)">
var els = document.getElementsByName("tname");
function fn(e){
for (var i = els.length;i-- ; ) {
if(els[i] == e){
alert("第" + (i+1) + "个元素");
break;
}
}
}