键盘事件Ctrl+Enter

<textarea id="txt1" rows="10" cols="40"></textarea><br />
<input id="txt2" type="text" />
<input id="btn1" type="button" value="留言"/> <script>
window.onload = function() {var oBtn = document.getElementById('btn1');var oTxt1 = document.getElementById('txt1');var oTxt2 = document.getElementById('txt2');oBtn.onclick = function() {oTxt1.value += oTxt2.value + '\n';oTxt2.value = '';};oTxt2.onkeydown = function(ev) {var oEvent = ev || event;if (oEvent.ctrlKey && oEvent.keyCode == 13) {oTxt1.value += oTxt2.value + '\n';oTxt2.value = '';}}
}
</script>