在主题comments.php文件中提交按钮的下面添加如下代码即可：
<script type="text/javascript">
//<![CDATA[
document.getElementById("comment").onkeydown = function (moz_ev)
{
var ev = null;
if (window.event){
ev = window.event;
}else{
ev = moz_ev;
}
if (ev != null && ev.ctrlKey && ev.keyCode == 13)
{
document.getElementById("submit").click();
}
}
//]]>
</script>