Original address: http://www.java2000.net/p11027
A piece of code provided by a user.
<title> convert 15-bit ID card into 18</title> <script language= "JavaScript" > var v = new array (); var vs = "10x98765432"; var newCardID = ""; function onload () { document.getelementbyid ("Cardid"). focus (); &NBSP;&NBSP;&NBSP;&NBSP} function checkcardid (cardID15) { v.push (2, 4, 8, 5, 10, 9, 7,&NBSP;3,&NBSP;6,&NBSP;1,&NBSP;2,&NBSP;4,&NBSP;8,&NBSP;5,&NBSP;10,&NBSP;9,&NBSP;7); var cardID = cardID15.value; if (cardid.length!=15) { alert ("Please enter your ID number for 15 digits.") "); cardid15.focus (); return; } var Month = cardid.substring (8,10)//Get a 15-digit number in the Month if (! Checkmonth (month)) { alert ("You entered the ID card format is incorrect, month fill error." ") cardid15.focus (); return; } var year = " + cardid.substring" (6,8); &nBsp; var day = cardid.substring (10,12); if (!checkday (year,month,day)) { alert ("you entered an incorrect format of the ID card, the date grid filled in error"); cardid15.focus (); return; &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP} //alert (CheckDay (year,month,day)); //15-bit number converted to 17-bit var cardIDcardID17 = 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 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; &NBSP;&NBSP;&NBSP} if (month==1| | month==3| | month==5| | month==7| | month==8| |month==10| | MONTH==12) { Mday = 31; &NBSP;&NBSP;&NBSP;&NBSP} if (month==4| | month==6| | month==9| | month==11) { Mday = 30; &NBSP;&NBSP;&NBSP;&NBSP} if (month==2) { mday = isleapyear (year); &NBSP;&NBSP;&NBSP;&NBSP} if (day>mday) { return false; } return true; //Determine if the year you entered is a leap years function isleapyear { return (year % 4 == 0 && year % 100 != 0) | | (year % 400 == 0) ? 29 : 28; Function checknewcardid () {alert ("18-bit ID number is:" +newcardid);} </script> <body onload= "onload ()" > 15-digit number: <input id= "Cardid" type= "text" maxlength= "onmouseout=" Checkcardid "(This)" /></br> 18-digit number: <input id= "cardID18" type= "text" readonly= "readonly"/>
<input type= "button" onclick= "Checknewcardid ();" value= "Submit"/> </body>
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