div,contenteditable编辑器之ctrl+enter换行，enter发送

 //回车发消息
        $scope.keyDownSend = function ($event) {
            var keycode = window.event?$event.keyCode:$event.which;
            var evt = $event || window.event;
            var inputTxt = document.getElementById("richText");
            // 回车-->发送消息
            if(keycode==13 && !(evt.ctrlKey)){
                sendMessage();
                $event.preventDefault();
                return false;
            }
            // ctrl+回车-->换行
            if (evt.ctrlKey && evt.keyCode == 13) {
                //inputTxt.value += ‘\n‘;
                var $richText_opt = $(‘#richText‘);
                $richText_opt.html($richText_opt.html() + ‘<br>‘);
                placeCaretAtEnd($richText_opt.get(0));
                return false;
            }

function placeCaretAtEnd(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();
            }
        }
//发消息
        $scope.send_test = function($event) {
            var contet = $(‘#richText‘).html().replace(/&nbsp;/g, ‘ ‘).replace(/&amp;/g, ‘&‘);
            if($($event.target).hasClass(‘on‘)){
                sendErrorTips(contet);
                sendMessage();
            } else if (!contet){
                showErrorTip(newsTips.emptyContent);
            }
            //发送消息后清除类
            $($event.target).removeClass(‘on‘);
        };