中国第二代身份证验证js代码

      下面这部分代码截取自盛大的某个网页，具体我就不给url了，下面是对应的js代码：

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 }