var check={
   var check = {
//是否為空
    isNull: function (str) {
      if ($.trim(str).length == 0)return true;
      else return false;
    },
//是否為郵件
    isEmail: function (str) {
      var reg = /^\w+((-w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/;
      if (reg.test(str))return true;
    },
//是否為手機號
 

    isPhone: function (str) {
      var a = /^1\d{10}$/, s = $.trim(str);
      if (a.test(s))return true;
    },
//是否漢字
    isCN: function (str) {
      var s = $.trim(str), reg = /^[\u4e00-\u9fa5]+$/;
      if (reg.test(s))return true;
      else return false;
    },
//是否密碼
    isPwd: function (str) {
      var
 
 reg = /^[A-Za-z0-9_-]+$/;
      if (reg.test(str))return true;
    },
//是否為微訊號
    isWx: function (str) {
      var rex = /^[a-zA-Z\d_]{5,}$/;
      if (rex.test($.trim(str)))return true;
      return false;
    },
//是否全為數字
    isNum: function (num) {
      var rex = /^[0-9]+$/;
      if (rex.test($.trim(num)))return
 
 true;
      return false;
    },
//是否全為熱線電話
    isHotline: function (num) {
      var rex = /^[0-9]([0-9]|-)*[0-9]$/;
      if (rex.test($.trim(num)))return true;
      return false;
    },
//是否為錢數
    isMoney: function (n) {
      var rex = /^[0-9]+$/;
      var num = n.trim();
      var _this = this;
      var numArr = num.toString().split('.');
      var len = numArr.length;
      var temp = 0;
      if (len > 2)return false;
      if (len == 2) {
        var l = numArr[1].length;
        var l1 = numArr[0].length;
        if (l > 2) {
          return false;
        }
        if (numArr[0].trim().length != l1)return false;
      }
      $.each(numArr, function (i) {
        if (numArr[i] < 0 || !_this.isNum(numArr[i])) {
          temp = 1
        }
      });
      if (temp)return false;
      return true;
    },

//判斷是否為url地址
    isUrl: function (str) {
      var rex = /^(http|https){1}:\/\/[^\s]+$/;
      if (rex.test($.trim(str)))return true;
      else return false;
    }
}

使用方式

//str 為所需 驗證字元
if(check.isNull(str)){
//dong something
}