Created
June 6, 2014 11:54
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15位身份证转换为18位
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| /** | |
| * 15位身份证转换为18位 | |
| * | |
| */ | |
| function getIdCardNumber18(idCardNumber){ | |
| if (!idCardNumber) { | |
| return null; | |
| } | |
| // 转换为字符串 | |
| idCardNumber = '' + idCardNumber; | |
| if (idCardNumber.length === 18) { | |
| return idCardNumber; | |
| } else if (idCardNumber.length !== 15) { | |
| return null; | |
| } | |
| /* 首先将身份证号码扩展至17位: 将出生年扩展为19XX的形式 */ | |
| var idCardNumber17 = idCardNumber.substring(0, 6) + "19" + idCardNumber.substring(6); | |
| /* 计算校验码 */ | |
| var nSum = 0; | |
| for (var nCount = 0; nCount < 17; nCount++) { | |
| nSum += (parseInt(idCardNumber17[nCount], 10) * (Math.pow(2, 17 - nCount) % 11)); | |
| } | |
| nSum = nSum % 11; | |
| if (nSum <= 1) { | |
| nSum = 1 - nSum; | |
| } else { | |
| nSum = 12 - nSum; | |
| } | |
| /* | |
| * BUGFIX:18位身份证最后一位应该是X | |
| */ | |
| if (nSum === 10) { | |
| return idCardNumber17 + "X"; | |
| } else { | |
| return idCardNumber17 += nSum; | |
| } | |
| } |
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