Ctrl+Enter 提交聊天信息

    window.onload = function() {
        var content = document.getElementById("content");
        var info = document.getElementById("info");
        var btn = document.getElementById("btn");

        info.onkeydown = function(ev) {
            var oEvent = ev || event;
            
            if (oEvent.ctrlKey && oEvent.keyCode === 13) {
                content.value += info.value + "
";
                info.value = "";
            }
        };

        btn.onclick = function() {
            content.value += info.value + "
";
            info.value = "";
        };
    };