js校验身份证

//身份证校验
  var checkCode = function (val) {
    var p = /^[1-9]\d{5}(18|19|20)\d{2}((0[1-9])|(1[0-2]))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$/;
    var factor = [ 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 ];
    var parity = [ 1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2 ];
    var code = val.substring(17);
    if(p.test(val)) {
      var sum = 0;
      for(var i=0;i<17;i++) {
        sum += val[i]*factor[i];
      }
      if(parity[sum % 11] == code.toUpperCase()) {
        return true;
      }
    }
    return false;
  }
  var checkDate = function (val) {
    var pattern = /^(18|19|20)\d{2}((0[1-9])|(1[0-2]))(([0-2][1-9])|10|20|30|31)$/;
    if(pattern.test(val)) {
      var year = val.substring(0, 4);
      var month = val.substring(4, 6);
      var date = val.substring(6, 8);
      var date2 = new Date(year+"-"+month+"-"+date);
      if(date2 && date2.getMonth() == (parseInt(month) - 1)) {
        return true;
      }
    }
    return false;
  }
  var checkProv = function (val) {
    var pattern = /^[1-9][0-9]/;
    var provs = {11:"北京",12:"天津",13:"河北",14:"山西",15:"内蒙古",21:"辽宁",22:"吉林",23:"黑龙江 ",31:"上海",32:"江苏",33:"浙江",34:"安徽",35:"福建",36:"江西",37:"山东",41:"河南",42:"湖北 ",43:"湖南",44:"广东",45:"广西",46:"海南",50:"重庆",51:"四川",52:"贵州",53:"云南",54:"西藏 ",61:"陕西",62:"甘肃",63:"青海",64:"宁夏",65:"新疆",71:"台湾",81:"香港",82:"澳门"};
    if(pattern.test(val)) {
      if(provs[val]) {
        return true;
      }
    }
    return false;
  }
  var checkID = function (val) {
    if(checkCode(val)) {
      var date = val.substring(6,14);
      if(checkDate(date)) {
        if(checkProv(val.substring(0,2))) {
          return true;
        }
      }
    }
    return false;
  }

  $('#visitorsId').blur(function () {
    console.log(checkID($("#visitorsId").val()));
  
  })