<HTML><script language="javascript"> function showclick() { document.getElementById('c1').click(); timerID = setTimeout("showclick()",4000);//设时间（毫秒）
}
</script><BODY onLoad="showclick();">
<form name="form1" method="post" action="">
<input type="button" name="Submit" value="按钮" id="c1" onClick="alert('点了');">
</form>
</BODY>
</HTML>
}
</script><BODY onLoad="showclick();">
<form name="form1" method="post" action="">
<input type="button" name="Submit" value="按钮" id="c1" onClick="alert('点了');">
</form>
</BODY>
</HTML>
btnObj.click();
//或
btnObj.onclick();