From 27c2f609698a5adfaa7fd72610355f7be017ec56 Mon Sep 17 00:00:00 2001
From: neehow <7135209+neehow@users.noreply.github.com>
Date: Tue, 9 Apr 2019 00:18:07 +0800
Subject: [PATCH] add readme and source

---
 README.md | 18 +++++++++++++++++-
 index.js  | 17 +++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)
 create mode 100644 index.js

diff --git a/README.md b/README.md
index d54694d..24328c0 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,18 @@
 # is-valid-id-card
-一个校验身份证号是否符合规则的方法。(A function to test if a Chinese ID card is valid.)
+一个校验身份证号是否符合规则的方法。(A function to test if a Chinese ID card is valid.)   
+校验身份证是否符合标准   
+参考国家标准:[GB 11643-1999](http://www.gb688.cn/bzgk/gb/newGbInfo?hcno=080D6FBF2BB468F9007657F26D60013E)，只有18位身份证才符合标准   
+参考了此文章：https://blog.csdn.net/qq_41589580/article/details/81040772   
+暂时未做每月不同天数及闰年的校验，如生日是2月31号也返回true。今后有空可能会加上此校验。    
+注意：身份证号符合规则，只是该身份证号符合国家标准中的规则，并不意味着该身份证号真实存在。
+
+## Installation
+npm install is-valid-id-card --save
+
+## Examples
+```
+const isValidIDCard = require('is-valid-id-card')
+console.log(isValidIDCard('')) // false
+console.log(isValidIDCard('123456')) // false 
+console.log(isValidIDCard('11012119880808223x')) // true
+```
\ No newline at end of file
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..c909ec0
--- /dev/null
+++ b/index.js
@@ -0,0 +1,17 @@
+function isValidIDCard (idNo) {
+  // 不能用数字，有精度问题
+  if (!idNo || typeof idNo !== 'string') return false
+  idNo = idNo.trim()
+  if (idNo.length !== 18) return false
+  // 正则校验
+  var rIdNo = /^(11|12|13|14|15|21|22|23|31|32|33|34|35|36|37|41|42|43|44|45|46|50|51|52|53|54|61|62|63|64|65)\d{4}(18|19|20)\d{2}(0[1-9]|1[012])(0[1-9]|[12]\d|3[01])\d{3}[0-9xX]$/
+  if (!rIdNo.test(idNo)) return false
+  // 加权因子
+  var weights = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1]
+  var nums = idNo.split('').map(str => +str.replace(/x/i, '10'))
+  var numsWithWeight = nums.map((n, i) => n * weights[i])
+  var sum = numsWithWeight.reduce((acc, cur) => acc + cur)
+  return sum % 11 === 1
+}
+
+module.exports = isValidIDCard