Jquery批量判断是否为空，是否为数字

            $(document).ready(function () {
                $("#btnSubmit").click(function () {
                    return isEmpty("") && isNum();
                });
            });

            //判断是否全部为空
            function isEmpty(expression) {
                var arry;
                if (typeof (expression) == "undefined") {
                    arry = $(".isEmpty");
                } else {
                    arry = $(expression);
                }
                for (i = 0; i < arry.length; i++) {
                    var cur = $(arry[i]);
                    if (cur.val() == "") {
                        alert(cur.attr("info") + "不能为空！");
                        cur.focus();
                        return false;
                    }
                }
                return true;
            }

            //判断是否全是整数
            function isNum(expression) {
                var arry;
                if (typeof (expression) == "undefined") {
                    arry = $(".isNumber");
                } else {
                    arry = $(expression);
                }
                for (i = 0; i < arry.length; i++) {
                    var cur = $(arry[i]);
                    if (!/^\d+$/.test(cur.val())) {
                        alert(cur.attr("info") + "必须是整数！");
                        cur.focus();
                        return false;
                    }
                }
                return true;
            }