页面级绑定回车事件

gistfile1.js

document.onkeydown = function (e) {
        // 兼容FF和IE和Opera
        var theEvent = e || window.event;
        var code = theEvent.keyCode || theEvent.which || theEvent.charCode;
        if (code == 13) {
            $('#formId').trigger('submit');
            return false;
        }
        return true;
};