//身份证验证
    	function CheckIdcard(idcard)
		{ 
		    var Errors=new Array( 
		    "验证通过！", 
		    "身份证号码位数不对！", 
		    "身份证号码出生日期超出范围或含有非法字符！", 
		    "身份证号码校验错误或末位含有字母时需大写！", 
		    "身份证地区非法！" 
		    ); 
		    var area={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 idcard,Y,JYM; 
		    var S,M; 
		    var idcard_array = new Array(); 
		    idcard_array = idcard.split(""); 
		    if(area[parseInt(idcard.substr(0,2))]==null){ 
		        alert(Errors[4]);
		        $('#identifyno').select();
		        return false;
		    }
		    switch(idcard.length)
		    { 
		        case 15: 
		            if ( (parseInt(idcard.substr(6,2))+1900) % 4 == 0 || ((parseInt(idcard.substr(6,2))+1900) % 100 == 0 && (parseInt(idcard.substr(6,2))+1900) % 4 == 0 ))
		                { 
		                    ereg=/^[1-9][0-9]{5}[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|[1-2][0-9]))[0-9]{3}$/; 
		                }
		            else 
		                { 
		                    ereg=/^[1-9][0-9]{5}[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))[0-9]{3}$/; 
		                } 
		            if(ereg.test(idcard)){ 
		              return true;
		            }
		            else{ 
		                alert(Errors[2]);
		                $('#identifyno').focus();
		                $('#identifyno').select();
		                return false;
		            }
		            break; 
		        case 18: 
		            if ( parseInt(idcard.substr(6,4)) % 4 == 0 || (parseInt(idcard.substr(6,4)) % 100 == 0 && parseInt(idcard.substr(6,4))%4 == 0 ))
		                { 
		                    ereg=/^[1-9][0-9]{5}19[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|[1-2][0-9]))[0-9]{3}[0-9Xx]$/;//闰年出生日期的合法性正则表达式 
		                } 
		            else 
		                { 
		                    ereg=/^[1-9][0-9]{5}19[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))[0-9]{3}[0-9Xx]$/;//平年出生日期的合法性正则表达式 
		                } 
		            if(ereg.test(idcard))
		                { 
		                    S = (parseInt(idcard_array[0]) + parseInt(idcard_array[10])) * 7 + (parseInt(idcard_array[1]) + parseInt(idcard_array[11])) * 9 + (parseInt(idcard_array[2]) + parseInt(idcard_array[12])) * 10 + (parseInt(idcard_array[3]) + parseInt(idcard_array[13])) * 5 + (parseInt(idcard_array[4]) + parseInt(idcard_array[14])) * 8 + (parseInt(idcard_array[5]) + parseInt(idcard_array[15])) * 4 + (parseInt(idcard_array[6]) + parseInt(idcard_array[16])) * 2 + parseInt(idcard_array[7]) * 1 + parseInt(idcard_array[8]) * 6 + parseInt(idcard_array[9]) * 3 ; 
		                    Y = S % 11; 
		                    M = "F"; 
		                    JYM = "10X98765432"; 
		                    M = JYM.substr(Y,1); 
		            if(M == idcard_array[17]){ 
		                return true;
		            }
		            else {
		                alert(Errors[3]);
		                //$('#identifyno').focus();
		                $('#identifyno').select();
		                return false;
		            }
		                } 
		            else {
		                alert(Errors[2]);
		                $('#identifyno').select();
		                return false;
		            }
		            break; 
		        default: 
		                alert(Errors[1]);
		       			 $('#identifyno').select();
		       			return false;
		            break; 
		        } 
} 

保存的时候调用 if(!CheckIdcard($('#identifyno').val())){
         		  return;
     		  }

onkeyup="this.value=this.value.replace(/\D/g,'')"

//前 17个数字如果第18个x改成X
    	function limit_value(obj)  
    	{  
    	  if(obj.value=="") return;  
    	  else{  
    	  if(obj.value.length <18)  
    	  obj.value=obj.value.replace(/[^\d]/g,'');  
    	  if(obj.value.length==18&obj.value.substr(17,1)=="x")  
    	  obj.value=obj.value.substr(0,17)+'X';
    	    
    	  else  
    	  obj.value=obj.value.substr(0,17)+obj.value.substr(17,1).replace(/[^X0-9]/,'');
    	    
    	  }  
    	}