有十个旋钮点击按钮aler按钮的序号 _Web前端

有十个按钮点击按钮aler按钮的序号
问题:有十个按钮点击按钮aler按钮的序号

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>有十个按钮点击按钮aler按钮的序号</TITLE>
</HEAD>

<BODY>
<input type="button" />
<input type="button" />
<input type="button" />
<input type="button" />
<input type="button" />
<input type="button" />
<input type="button" />
<input type="button" />
<input type="button" />
<input type="button" />
</BODY>
</HTML>
<script type="text/javascript">
var buttons = document.getElementsByTagName("input");

for(var i = 0; i < buttons.length; i++){
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}
</script>