JQuery判断是否为数字，是否为空

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 $(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;  }