JS strictly check the ID number

Directly on the code

<! DOCTYPE html>functionCheck () {varIdcard = document.getElementById ("Idcard"). Value; varFlag =idcardvalidate (Idcard); if(flag) {alert (Correct "); } Else{alert ("The ID number you entered is not in the correct format"); }}varWi = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1];//weighting FactorvarValidecode = [1, 0, 10, 9, 8, 7, 6, 5, 4, 3, 2];//ID Verification bit value. 10 for xfunctionidcardvalidate (idcard) {Idcard= Trim (idcard.replace (//g, "")); Remove string kinsoku and trailing spacesif(Idcard.length = = 15) {        returnIsvaliditybrithby15idcard (Idcard);//verification of 15-digit ID card}Else if(Idcard.length = = 18) {        varA_idcard = Idcard.split ("");//get an array of ID cards        if(Isvaliditybrithby18idcard (Idcard) && Istruevalidatecodeby18idcard (A_idcard)) {//basic verification and 18th bit verification for 18-bit ID cards            return true; } Else {            return false; }    } Else {        return false; }}/** * Determine if the last verification bit is correct when the ID number is 18 digits * @param a_idcard ID number array * @return*/functionIstruevalidatecodeby18idcard (a_idcard) {varsum = 0;//declaring weighted summation variables    if(a_idcard[17].tolowercase () = = ' X ') {a_idcard[17] = 10;//replace the last X-digit verification code with 10 to facilitate subsequent operations    }     for(vari = 0; I < 17; i++) {sum+ = wi[i] * A_idcard[i];//weighted sum} valcodeposition= sum% 11;//get the Verification code location    if(a_idcard[17] = =Validecode[valcodeposition]) {        return true; } Else {        return false; }}/** * Verify that birthdays in 18-digit ID numbers are valid birthdays * @param idcard 18-bit book ID string * @return*/functionIsvaliditybrithby18idcard (idCard18) {varYear = idcard18.substring (6, 10); varmonth = idcard18.substring (10, 12); varDay = idcard18.substring (12, 14); varTemp_date =NewDate (year, parsefloat (month)-1, Parsefloat (day)); //get the Year with getFullYear () to avoid the millennium bug problem    if(Temp_date.getfullyear ()! = parsefloat (year) | |Temp_date.getmonth ()! = parsefloat (month)-1 | |temp_date.getdate ()!=parsefloat (Day)) {        return false; } Else {        return true; }}/** * Verify that birthdays in 15-digit ID numbers are valid birthdays * @param idCard15 15-bit book ID string * @return*/functionIsvaliditybrithby15idcard (idCard15) {varYear = idcard15.substring (6, 8); varmonth = idcard15.substring (8, 10); varDay = idcard15.substring (10, 12); varTemp_date =NewDate (year, parsefloat (month)-1, Parsefloat (day)); //Use the GetYear () method for the age of your old ID card without considering the millennium bug problem    if(Temp_date.getyear ()! = parsefloat (year) | |Temp_date.getmonth ()! = parsefloat (month)-1 | |temp_date.getdate ()!=parsefloat (Day)) {        return false; } Else {        return true; }}//Remove string kinsoku and trailing spacesfunctionTrim (str) {returnStr.replace (/(^\s*) | ( \s*$)/g, "");}</script>
JS strictly check the ID number