function isLetterNumber(str)
{	var pattern="^[a-zA-Z0-9]+$";
	if(str.match(pattern))
		return true;
	else
		return false;
}

function isAccount(str)
{	var pattern="^[a-zA-Z]\\w+$";
	if(str.match(pattern))
		return true;
	else
		return false;
}

function isEmail(str)
{	var pattern=/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/;
	if(str.match(pattern))
		return true;
	else
		return false;
}
	
function isNumber(str)
{	var pattern="\\d*";
	if(str.match(pattern))
		return true;
	else
		return false;
}

function isPassword(str)
{	var pattern="\\S*";
	if(str.match(pattern))
		return true;
	else
		return false;
}

function checkIdcard(idcard){   
   var Errors=new Array("pass","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!","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();
   var age;
   idcard_array = idcard.split("");   
   if(area[parseInt(idcard.substr(0,2))]==null) return Errors[4];   
   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}$/;//测试出生日期的合法性   
       }   
       else{   
         ereg = /^[1-9][0-9]{5}[0-9]{2}((01|03|05|07|08|10|12)(0[1-9]|[1-2][0-9]|3[0-1])|(04|06|09|11)(0[1-9]|[1-2][0-9]|30)|02(0[1-9]|1[0-9]|2[0-8]))[0-9]{3}$/;//测试出生日期的合法性   
       }
	   age = parseInt(new Date().getFullYear()) - parseInt(idcard.substr(6,2))-1900;
       if(ereg.test(idcard)) {
				
		   	   if ( age < 18)
				{
					alert("您已被列入防沉迷系统！");
				}
         return Errors[0];
	   }
       else  
         return Errors[2];
     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   
     }
	 age = parseInt(new Date().getFullYear()) - parseInt(idcard.substr(6,4));
     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.toLowerCase() == idcard_array[17].toLowerCase()) {
		   
		   if ( age < 18)
		   {
				alert("您已被列入防沉迷系统！");
		   }
		   return Errors[0];
	   }
       else  
         return Errors[3];   
     }   
     else  
       return Errors[2];   
     break;   
   default:   
     return Errors[1];   
     break;   
   }   
 }