可编辑div:contenteditable之ctrl+enter换行，enter发送

//发送消息可编辑div
//回车发消息
$("#textarea").keydown(function($event){
var keycode = window.event ? $event.keyCode : $event.which;
var evt = $event || window.event;
var inputTxt = $(this);
// 回车-->发送消息
if (keycode == 13 && !(evt.ctrlKey)) {
// 发送消息的代码
woohecc.send_msg();
$event.preventDefault();
return false;
}
// ctrl+回车-->换行
if (evt.ctrlKey && evt.keyCode == 13) {
inputTxt.html(inputTxt.html() + '<br>');
woohecc.placeCaretAtEnd(inputTxt.get(0));
return false;
}
});

var woohecc = {
placeCaretAtEnd : function(el) {
el.focus();
if (typeof window.getSelection != "undefined"
&& typeof document.createRange != "undefined") {
var range = document.createRange();
range.selectNodeContents(el);
range.collapse(false);
var sel = window.getSelection();
sel.removeAllRanges();
sel.addRange(range);
}
else if (typeof document.body.createTextRange != "undefined") {
var textRange = document.body.createTextRange();
textRange.moveToElementText(el);
textRange.collapse(false);
textRange.select();
}
},
}