<ptml> <pead> <title>javascript 15-bit ID to 18</title> <script language= "JavaScript" > var v = new Array (); var vs = "10x98765432"; var newcardid = ""; function onload () {document.getElementById ("Cardid"). focus (); The function Checkcardid (cardID15) {V.push (2, 4, 8, 5, 10, 9, 7, 3, 6, 1, 2, 4, 8, 5, 10, 9, 7); var cardid = Cardid15.value; if (cardid.length!=15) {alert ("Please enter your ID number 15)!" "); Cardid15.focus (); Return var month = cardid.substring (8,10);//Get the month of 15-digit number if (!checkmonth (month)) {alert ("you entered the ID card format is incorrect, month fill error!") ") Cardid15.focus (); Return var year = "n" + cardid.substring (6,8); var day = cardid.substring (10,12); if (!checkday (Year,month,day)) {alert ("you entered an incorrect format for the ID card, the date grid is filled in incorrectly"); Cardid15.focus (); Return }//alert (Checkday (year,month,day)); Converts the 15-bit number to 17-bit var cardID17 = cardid.substring (0,6) + "+cardid.substring" (6); var N = 0; var R =-1; var T = ' 0 '//Save last digit var j = 0; var cardid18= ""; Count out the 18th digit for (var i= 16; I >= 0; i--) {N + = parseint (cardid17.substring (i, i + 1)) * V[J]; j + +; } R = N% 11; T = Vs.charat (R); cardID18 = cardID17 + T; document.getElementById ("cardID18"). Value=cardid18; Newcardid = cardID18; //Determine if the month entered is correct function checkmonth (month) {if month<1| | MONTH>12) {return false; return true; /** * * Check that the number of days you enter is correct **yean for the year **month for the month **day for the day **/function Checkday (year,month,day) {var mday = 0; if (day<1| | DAY>31) {return false; } if (month==1| | month==3| | month==5| | month==7| | month==8| |month==10| | month==12) {mday = 31; } if (month==4| | month==6| | month==9| | month==11) {mday = 30; } if (month==2) {mday = Isleapyear (year); } if (Day>mday) {return false; return true; //Determine if the year you entered is a leap years function Isleapyear {return (annual% 4 = 0 && Year% 100!= 0) | | (Year% 400 = 0)? 29:28; function Checknewcardid () {alert ("18-bit ID number is:" +newcardid); } </script> </pead> <body onload= "onLoad () > 15-bit number: <input id= "Cardid" type= "text" maxlength= "onmouseout=" Checkcardid (This) "/></br> 18-bit number: <input id= "cardID18" type= "text" readonly= "readonly"/> <input type= "button" onclick= "Checknewcardid () ; "Value="/> </body> </ptml>
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