写一个js函数来用

调用方法 if(IdentityCodeValid(v0))

        function IdentityCodeValid(code) {
            var city={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",91:"国外 "};
            var tip = "";
            var pass= true;
           
            if(!code || !/^\\d{6}(18|19|20)?\\d{2}(0[1-9]|1[12])(0[1-9]|[12]\\d|3[01])\\d{3}(\\d|X)$/i.test(code)){
                tip = "身份证号格式错误";
                pass = false;
            }
           
           else if(!city[code.substr(0,2)]){
                tip = "地址编码错误";
                pass = false;
            }
            else{
                //18位身份证需要验证最后一位校验位
                if(code.length == 18){
                    code = code.split(\'\');
                    //∑(ai×Wi)(mod 11)
                    //加权因子
                    var factor = [ 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 ];
                    //校验位
                    var parity = [ 1, 0, \'X\', 9, 8, 7, 6, 5, 4, 3, 2 ];
                    var sum = 0;
                    var ai = 0;
                    var wi = 0;
                    for (var i = 0; i < 17; i++)
                    {
                        ai = code[i];
                        wi = factor[i];
                        sum += ai * wi;
                    }
                    var last = parity[sum % 11];
                    if(parity[sum % 11] != code[17]){
                        tip = "校验位错误";
                        pass =false;
                    }
                }
            }
            if(!pass) alert(tip);
            return pass;
        }

弄一个函数来用不好？直接复制粘贴就行了。很方便的啊。

如果要直接判断就这样写

if(!/^\\d{6}(18|19|20)?\\d{2}(0[1-9]|1[12])(0[1-9]|[12]\\d|3[01])\\d{3}(\\d|X)$/i.test(v0)){

}

2楼、4楼代码都没问题。请单独做一个例子测试。

如果你要调试，打开浏览器的调试功能，看报什么错。

function validit_zhengjian(){
alert("ok");
  var code = document.getElementById("sfzh").value;  //ajaxform_details.js
  var v1 = document.getElementById("up1_thumbnails").getElementsByTagName("li").length;
  var v2 = document.getElementById("up4_thumbnails").getElementsByTagName("li").length;
  alert(v1 + " " + v2);
 if(IdentityCodeValid(code)){
  showTopTips("toptip1","请正确输入身份证号码！",2000);
  return false;
  }
 if(v1 < 1){
  showTopTips("toptip1","请上传身份证正面照片！",2000);
  return false;
  }
 if(v1 > 1){
  showTopTips("toptip1","身份证正面照片大于1张！",2000);
  return false;
  }
 if(v2 < 1){
  showTopTips("toptip1","请上传身份证反面照片！",2000);
  return false;
  }
 if(v2 > 1){
  showTopTips("toptip1","身份证反面照片大于1张！",2000);
  return false;
  }
  show("tst1",2000);
  var result = submitAjaxForm(\'form1\',\'afterSubmit\');
  return true;
}

function afterSubmit(result){
  hide("tst1");
 if (result==\'OK\') {
  show("tst2");
  //location="success.htm";
  }
 else{
    show("tst3",2000);
  }
}