第二代身份证号码的验证代码

function cardValidity() {
iW = new Array(7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2,1);
iSum = 0;
for ( i=0;i<17;i++) {
iC = v_card.charAt(i) ;
iVal = parseInt(iC);
iSum += iVal * iW[i];
}
iJYM = iSum % 11;
var sJYM = '';
if (iJYM == 0) sJYM = "1";
else if (iJYM == 1 ) sJYM = "0";
else if (iJYM == 2 ) sJYM = "x";
else if (iJYM == 3 ) sJYM = "9";
else if (iJYM == 4 ) sJYM = "8";
else if (iJYM == 5 ) sJYM = "7";
else if (iJYM == 6 ) sJYM = "6";
else if (iJYM == 7 ) sJYM = "5";
else if (iJYM == 8 ) sJYM = "4";
else if (iJYM == 9) sJYM = "3";
else if (iJYM == 10) sJYM = "2";
var cCheck = v_card.charAt(17).toLowerCase();
if( cCheck != sJYM ){
return false; //对不上就是假号码
} else {
return true;
}
}