diff --git a/.gitignore b/.gitignore
index ce243fa..a276f0f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,7 @@
 *.xdb
 *.iml
 META-INF/
+.DS_Store
 
 # Binary Files #
 *.jar
@@ -71,6 +72,9 @@ target
 /v1.0/binding/nodejs/coverage
 /binding/nodejs/tests/unitTests/__snapshots__
 /binding/nodejs/coverage
+/binding/nodejs/node_modules
+/binding/nodejs/.nyc_output
+/binging/nodejs/package-lock.json
 
 # maker
 ## golang
diff --git a/binding/nodejs/.eslintrc.js b/binding/nodejs/.eslintrc.js
new file mode 100644
index 0000000..11a8bcc
--- /dev/null
+++ b/binding/nodejs/.eslintrc.js
@@ -0,0 +1,17 @@
+module.exports = {
+  env: {
+    browser: true,
+    commonjs: true,
+    es2021: true
+  },
+  parserOptions: {
+    ecmaVersion: 'latest'
+  },
+  extends: [
+    'standard'
+  ],
+  globals: {
+    describe: true,
+    it: true
+  }
+}
diff --git a/binding/nodejs/.mocharc.json b/binding/nodejs/.mocharc.json
new file mode 100644
index 0000000..bf668ea
--- /dev/null
+++ b/binding/nodejs/.mocharc.json
@@ -0,0 +1,5 @@
+{
+  "reporter": "spec",
+  "timeout": 60000,
+  "exit": true
+}
\ No newline at end of file
diff --git a/binding/nodejs/.nycrc.json b/binding/nodejs/.nycrc.json
new file mode 100644
index 0000000..8fb5c3d
--- /dev/null
+++ b/binding/nodejs/.nycrc.json
@@ -0,0 +1,5 @@
+{
+  "all": true,
+  "report-dir": "./coverage/",
+  "reporter": ["text", "html"]
+}
\ No newline at end of file
diff --git a/binding/nodejs/ReadMe.md b/binding/nodejs/ReadMe.md
index 85829b5..83d7204 100644
--- a/binding/nodejs/ReadMe.md
+++ b/binding/nodejs/ReadMe.md
@@ -1,7 +1,155 @@
 # ip2region nodejs 查询客户端实现
 
-# 使用方式
+## 使用方式
 
-# 查询测试
+### 完全基于文件的查询
 
-# bench 测试
+```javascript
+// 导入包
+const Searcher = require('.')
+// 指定ip2region数据文件路径
+const dbPath = 'ip2region.xdb file path'
+
+try {
+  // 创建searcher对象
+  const searcher = Searcher.newWithFileOnly(dbPath)
+  // 查询
+  const data = await searcher.search('218.4.167.70')
+  // data: {region: '中国|0|江苏省|苏州市|电信', ioCount: 3, took: 1.342389}
+} catch(e) {
+  console.log(e)
+}
+
+```
+
+### 缓存 `VectorIndex` 索引
+
+```javascript
+// 导入包
+const Searcher = require('.')
+// 指定ip2region数据文件路径
+const dbPath = 'ip2region.xdb file path'
+
+try {
+  // 同步读取vectorIndex
+  const vectorIndex = Searcher.loadVectorIndexFromFile(dbPath)
+  // 创建searcher对象
+  const searcher = Searcher.newWithVectorIndex(dbPath, vectorIndex)
+  // 查询 await 或 promise均可
+  const data = await searcher.search('218.4.167.70')
+  // data: {region: '中国|0|江苏省|苏州市|电信', ioCount: 2, took: 0.402874}
+} catch(e) {
+  console.log(e)
+}
+```
+
+### 缓存整个 `xdb` 数据
+
+```javascript
+// 导入包
+const Searcher = require('.')
+// 指定ip2region数据文件路径
+const dbPath = 'ip2region.xdb file path'
+
+try {
+  // 同步读取buffer
+  const buffer = Searcher.loadContentFromFile(dbPath)
+  // 创建searcher对象
+  const searcher = Searcher.newWithVectorIndex(buffer)
+  // 查询 await 或 promise均可
+  const data = await searcher.search('218.4.167.70')
+  // data: {region:'中国|0|江苏省|苏州市|电信', ioCount: 0, took: 0.063833}
+} catch(e) {
+  console.log(e)
+}
+```
+
+## 查询测试
+
+可以通过 `node ./tests/test.app.js` 命令来测试查询：
+
+```shell
+➜  nodejs git:(v2.0-for-nodejs) ✗ node ./tests/test.app.js --help
+usage: Usage node test.app.js <agrs>
+
+ip2region test app
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -d DB, --db DB        ip2region binary xdb file path, default: ../../data/ip2region.xdb
+  -c CACHE_POLICY, --cache-policy CACHE_POLICY
+                        cache policy: file/vectorIndex/content, default: content
+```
+
+例如：使用默认的 data/ip2region.xdb 文件进行查询测试：
+
+```shell
+➜  nodejs git:(v2.0-for-nodejs) ✗ node ./tests/test.app.js
+parameters:
+    dbPath: ../../data/ip2region.xdb
+    cache-policy: content
+
+type 'quit' to exit
+ip2region>> 1.2.3.4
+{ region: '美国|0|华盛顿|0|谷歌', ioCount: 0, took: 54.606261 }
+ip2region>>
+```
+
+输入 ip 即可进行查询测试，也可以分别设置 `cache-policy` 为 file/vectorIndex/content 来测试三种不同缓存实现的查询效果。
+
+## bench 测试
+
+```shell
+➜  nodejs git:(v2.0-for-nodejs) ✗ node ./tests/bench.app.js --help
+usage: Usage node test.app.js [command options]
+
+ip2region benchmark app
+
+optional arguments:
+  -h, --help            show this help message and exit
+  --db DB               ip2region binary xdb file path, default: ../../data/ip2region.xdb
+  --src SRC             source ip text file path, default: ../../data/ip.merge.txt
+  --cache-policy CACHE_POLICY
+                        cache policy: file/vectorIndex/content, default: content
+
+```
+
+例如：通过默认的 data/ip2region.xdb 和 data/ip.merge.txt 文件进行 bench 测试：
+
+```shell
+➜  nodejs git:(v2.0-for-nodejs) ✗ node ./tests/bench.app.js
+options: 
+    dbPath: ../../data/ip2region.xdb
+    src: ../../data/ip2region.xdb
+    cache-policy: content
+
+Bench finished, {cachePolicy: content, total: 3417955, took: 20.591887765s, cost: 6.02462225658325μs/op}
+```
+
+可以通过分别设置 `cache-policy` 为 file/vectorIndex/content 来测试三种不同缓存实现的效果。  
+>Note: 注意 bench 使用的 src 文件要是生成对应 xdb 文件相同的源文件。
+
+## 单元测试及覆盖率结果
+
+```shell
+➜  nodejs git:(v2.0-for-nodejs) ✗ npm run coverage
+
+...
+
+  ip2region
+    ✔ #newWithFileOnly and search
+    ✔ #newWithVectorIndex and search
+    ✔ #newWithBuffer and search
+
+
+  3 passing (6ms)
+
+----------|---------|----------|---------|---------|----------------------------------
+File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s                
+----------|---------|----------|---------|---------|----------------------------------
+All files |   91.58 |    60.71 |     100 |   91.58 |                                  
+ index.js |   91.58 |    60.71 |     100 |   91.58 | 61,75,90,146,152,187,193,207,215 
+----------|---------|----------|---------|---------|----------------------------------
+```
+
+Made with ♥ by Wu Jian Ping
diff --git a/binding/nodejs/index.js b/binding/nodejs/index.js
new file mode 100644
index 0000000..0ed4896
--- /dev/null
+++ b/binding/nodejs/index.js
@@ -0,0 +1,201 @@
+/*
+ * Created by Wu Jian Ping on - 2022/07/22.
+ */
+
+const fs = require('fs')
+
+const VectorIndexSize = 8
+const VectorIndexCols = 256
+const VectorIndexLength = 256 * 256 * (4 + 4)
+const SegmentIndexSize = 14
+const IP_REGEX = /^((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.){3}(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])$/
+
+const getStartEndPtr = Symbol('#getStartEndPtr')
+const getBuffer = Symbol('#getBuffer')
+const openFilePromise = Symbol('#openFilePromise')
+
+class Searcher {
+  constructor (dbFile, vectorIndex, buffer) {
+    this._dbFile = dbFile
+    this._vectorIndex = vectorIndex
+    this._buffer = buffer
+
+    if (this._buffer) {
+      this._vectorIndex = this._buffer.subarray(256, 256 + VectorIndexLength)
+    }
+  }
+
+  async [getStartEndPtr] (idx, fd, ioStatus) {
+    if (this._vectorIndex) {
+      const sPtr = this._vectorIndex.readUInt32LE(idx)
+      const ePtr = this._vectorIndex.readUInt32LE(idx + 4)
+      return { sPtr, ePtr }
+    } else {
+      const buf = await this[getBuffer](256 + idx, 8, fd, ioStatus)
+      const sPtr = buf.readUInt32LE()
+      const ePtr = buf.readUInt32LE(4)
+      return { sPtr, ePtr }
+    }
+  }
+
+  async [getBuffer] (offset, length, fd, ioStatus) {
+    if (this._buffer) {
+      return this._buffer.subarray(offset, offset + length)
+    } else {
+      const buf = Buffer.alloc(length)
+      return new Promise((resolve, reject) => {
+        ioStatus.ioCount += 1
+        fs.read(fd, buf, 0, length, offset, (err) => {
+          if (err) {
+            reject(err)
+          } else {
+            resolve(buf)
+          }
+        })
+      })
+    }
+  }
+
+  [openFilePromise] (fileName) {
+    return new Promise((resolve, reject) => {
+      fs.open(fileName, 'r', (err, fd) => {
+        if (err) {
+          reject(err)
+        } else {
+          resolve(fd)
+        }
+      })
+    })
+  }
+
+  async search (ip) {
+    const startTime = process.hrtime()
+    const ioStatus = {
+      ioCount: 0
+    }
+
+    if (!isValidIp(ip)) {
+      throw new Error(`IP: ${ip} is invalid`)
+    }
+
+    let fd = null
+
+    if (!this._buffer) {
+      fd = await this[openFilePromise](this._dbFile)
+    }
+
+    const ps = ip.split('.')
+    const i0 = parseInt(ps[0])
+    const i1 = parseInt(ps[1])
+    const i2 = parseInt(ps[2])
+    const i3 = parseInt(ps[3])
+
+    const ipInt = i0 * 256 * 256 * 256 + i1 * 256 * 256 + i2 * 256 + i3
+    const idx = i0 * VectorIndexCols * VectorIndexSize + i1 * VectorIndexSize
+    const { sPtr, ePtr } = await this[getStartEndPtr](idx, fd, ioStatus)
+    let l = 0
+    let h = (ePtr - sPtr) / SegmentIndexSize
+    let result = null
+
+    while (l <= h) {
+      const m = (l + h) >> 1
+
+      const p = sPtr + m * SegmentIndexSize
+
+      const buff = await this[getBuffer](p, SegmentIndexSize, fd, ioStatus)
+
+      const sip = buff.readUInt32LE(0)
+
+      if (ipInt < sip) {
+        h = m - 1
+      } else {
+        const eip = buff.readUInt32LE(4)
+        if (ipInt > eip) {
+          l = m + 1
+        } else {
+          const dataLen = buff.readUInt16LE(8)
+          const dataPtr = buff.readUInt32LE(10)
+          const data = await this[getBuffer](dataPtr, dataLen, fd, ioStatus)
+          result = data.toString('utf-8')
+          break
+        }
+      }
+    }
+    if (fd) {
+      fs.close(fd)
+    }
+
+    const diff = process.hrtime(startTime)
+
+    const took = (diff[0] * 1e9 + diff[1]) / 1e3
+    return { region: result, ioCount: ioStatus.ioCount, took }
+  }
+}
+
+const _checkFile = dbPath => {
+  try {
+    fs.accessSync(dbPath, fs.constants.F_OK)
+  } catch (err) {
+    throw new Error(`${dbPath} ${err ? 'does not exist' : 'exists'}`)
+  }
+
+  try {
+    fs.accessSync(dbPath, fs.constants.R_OK)
+  } catch (err) {
+    throw new Error(`${dbPath} ${err ? 'is not readable' : 'is readable'}`)
+  }
+}
+
+const isValidIp = ip => {
+  return IP_REGEX.test(ip)
+}
+
+const newWithFileOnly = dbPath => {
+  _checkFile(dbPath)
+
+  return new Searcher(dbPath, null, null)
+}
+
+const newWithVectorIndex = (dbPath, vectorIndex) => {
+  _checkFile(dbPath)
+
+  if (!Buffer.isBuffer(vectorIndex)) {
+    throw new Error('vectorIndex is invalid')
+  }
+
+  return new Searcher(dbPath, vectorIndex, null)
+}
+
+const newWithBuffer = buffer => {
+  if (!Buffer.isBuffer(buffer)) {
+    throw new Error('buffer is invalid')
+  }
+
+  return new Searcher(null, null, buffer)
+}
+
+const loadVectorIndexFromFile = dbPath => {
+  const fd = fs.openSync(dbPath, 'r')
+  const buffer = Buffer.alloc(VectorIndexLength)
+  fs.readSync(fd, buffer, 0, VectorIndexLength, 256)
+  fs.close(fd)
+  return buffer
+}
+
+const loadContentFromFile = dbPath => {
+  const stats = fs.statSync(dbPath)
+  const buffer = Buffer.alloc(stats.size)
+  const fd = fs.openSync(dbPath, 'r')
+  fs.readSync(fd, buffer, 0, stats.size, 0)
+  fs.close(fd)
+  return buffer
+}
+
+module.exports = {
+  isValidIp,
+  loadVectorIndexFromFile,
+  loadContentFromFile,
+  newWithFileOnly,
+  newWithVectorIndex,
+  newWithBuffer
+}
diff --git a/binding/nodejs/package.json b/binding/nodejs/package.json
new file mode 100644
index 0000000..7228876
--- /dev/null
+++ b/binding/nodejs/package.json
@@ -0,0 +1,32 @@
+{
+  "name": "node-ip2region",
+  "version": "2.0.0",
+  "description": "official nodejs client of ip2region",
+  "main": "index.js",
+  "scripts": {
+    "lint": "eslint ./index.js",
+    "test": "mocha ./tests/function.test.js",
+    "coverage": "nyc npm run test",
+    "benchmark": "node ./tests/benchmark.js"
+  },
+  "author": "Wu Jian Ping",
+  "license": "ISC",
+  "devDependencies": {
+    "@types/chai": "^4.3.1",
+    "@types/node": "^18.0.6",
+    "argparse": "^2.0.1",
+    "benchmark": "^2.1.4",
+    "chai": "^4.3.6",
+    "eslint": "^8.20.0",
+    "eslint-config-standard": "^17.0.0",
+    "eslint-plugin-import": "^2.26.0",
+    "eslint-plugin-n": "^15.2.4",
+    "eslint-plugin-promise": "^6.0.0",
+    "linebyline": "^1.3.0",
+    "mocha": "^10.0.0",
+    "nyc": "^15.1.0"
+  },
+  "engines": {
+    "node": ">=8.0.0"
+  }
+}
\ No newline at end of file
diff --git a/binding/nodejs/tests/bench.app.js b/binding/nodejs/tests/bench.app.js
new file mode 100644
index 0000000..b1b1aeb
--- /dev/null
+++ b/binding/nodejs/tests/bench.app.js
@@ -0,0 +1,146 @@
+/*
+ * Created by Wu Jian Ping on - 2022/07/22.
+ */
+
+const Searcher = require('..')
+const { ArgumentParser } = require('argparse')
+const readline = require('linebyline')
+
+// 处理输入参数
+const parser = new ArgumentParser({
+  add_help: true,
+  description: 'ip2region benchmark app',
+  prog: 'node test.app.js',
+  usage: 'Usage %(prog)s [command options]'
+})
+
+parser.add_argument('--db', { help: 'ip2region binary xdb file path, default: ../../data/ip2region.xdb' })
+parser.add_argument('--src', { help: 'source ip text file path, default: ../../data/ip.merge.txt' })
+parser.add_argument('--cache-policy', { help: 'cache policy: file/vectorIndex/content, default: content' })
+
+const args = parser.parse_args()
+const dbPath = args.db || '../../data/ip2region.xdb'
+const src = args.src || '../../data/ip.merge.txt'
+const cachePolicy = args.cache_policy || 'content'
+
+// 创建searcher对象
+const createSearcher = () => {
+  let searcher = null
+  let vectorIndex = null
+  let buffer = null
+
+  switch (cachePolicy) {
+    case 'file':
+      searcher = Searcher.newWithFileOnly(dbPath)
+      break
+    case 'vectorIndex':
+      vectorIndex = Searcher.loadVectorIndexFromFile(dbPath)
+      searcher = Searcher.newWithVectorIndex(dbPath, vectorIndex)
+      break
+    default:
+      buffer = Searcher.loadContentFromFile(dbPath)
+      searcher = Searcher.newWithBuffer(buffer)
+  }
+  console.log('options: ')
+  console.log(`    dbPath: ${dbPath}`)
+  console.log(`    src: ${dbPath}`)
+  console.log(`    cache-policy: ${cachePolicy}`)
+  console.log('')
+  return searcher
+}
+
+const ipToInt = ip => {
+  // 切割IP
+  const ps = ip.split('.')
+  // 将各段转成int
+  const i0 = parseInt(ps[0])
+  const i1 = parseInt(ps[1])
+  const i2 = parseInt(ps[2])
+  const i3 = parseInt(ps[3])
+
+  // 假如使用移位操作的话，这边可能产生负数
+  return i0 * 256 * 256 * 256 + i1 * 256 * 256 + i2 * 256 + i3
+}
+
+const intToIp = ip => {
+  const i0 = Math.floor(ip / (256 * 256 * 256))
+  const i1 = Math.floor((ip % (256 * 256 * 256)) / (256 * 256))
+  const i2 = Math.floor((ip % (256 * 256)) / 256)
+  const i3 = ip % 256
+
+  return `${i0}.${i1}.${i2}.${i3}`
+}
+
+const searcher = createSearcher()
+
+// 开始时间
+const startTime = process.hrtime()
+let total = 0
+
+// 程序主入口
+const main = async () => {
+  const rl = readline(src)
+  rl
+    .on('line', async (line, lineCount, byteCount) => {
+      try {
+        const list = line.split('|')
+        const sip = list[0]
+        const eip = list[1]
+
+        if (!Searcher.isValidIp(sip)) {
+          throw new Error(`IP: ${sip} is invalid`)
+        }
+        if (!Searcher.isValidIp(eip)) {
+          throw new Error(`IP: ${eip} is invalid`)
+        }
+
+        const sipInt = ipToInt(sip)
+        const eipInt = ipToInt(eip)
+
+        if (sipInt > eipInt) {
+          throw new Error(`start ip(${sip}) should not be greater than end ip(${eip})`)
+        }
+
+        const mipInt = Math.floor((sipInt + eipInt) / 2)
+        const mip = intToIp(mipInt)
+
+        const mipLeftInt = Math.floor((sipInt + mipInt) / 2)
+        const mipLeft = intToIp(mipLeftInt)
+
+        const mipRightInt = Math.floor((mipInt + eipInt) / 2)
+        const mipRight = intToIp(mipRightInt)
+
+        const arr = [sip, mipLeft, mip, mipRight, eip]
+
+        for (let i = 0; i < arr.length; ++i) {
+          const target = arr[i]
+          const info = await searcher.search(target)
+
+          const region = list.slice(2, list.length).join('|')
+          // check the region info
+          if (region !== info.region) {
+            throw new Error(`failed search(${mip}) with (${region} != ${info.region})`)
+          }
+          total++
+        }
+      } catch (err) {
+        console.log(err)
+        process.exit(1)
+      }
+    })
+    .on('error', err => {
+      console.log(err)
+      process.exit(1)
+    })
+}
+
+process.on('exit', code => {
+  if (code === 0) {
+    // 这边只算个总时间就够了
+    const diff = process.hrtime(startTime)
+    const totalInNS = diff[0] * 1e9 + diff[1]
+    console.log(`Bench finished, {cachePolicy: ${cachePolicy}, total: ${total}, took: ${totalInNS / 1e9}s, cost: ${total === 0 ? 0 : (totalInNS / 1e3) / total}μs/op}`)
+  }
+})
+
+main()
diff --git a/binding/nodejs/tests/benchmark.js b/binding/nodejs/tests/benchmark.js
new file mode 100644
index 0000000..fef7ea7
--- /dev/null
+++ b/binding/nodejs/tests/benchmark.js
@@ -0,0 +1,38 @@
+/*
+ * Created by Wu Jian Ping on - 2022/07/22.
+ */
+
+const Benchmark = require('benchmark')
+const path = require('path')
+const Searcher = require('..')
+
+const dbPath = path.join(__dirname, '..', '..', '..', 'data', 'ip2region.xdb')
+const buffer = Searcher.loadContentFromFile(dbPath)
+const searcher1 = Searcher.newWithBuffer(buffer)
+
+const vectorIndex = Searcher.loadVectorIndexFromFile(dbPath)
+const searcher2 = Searcher.newWithVectorIndex(dbPath, vectorIndex)
+
+const searcher3 = Searcher.newWithFileOnly(dbPath)
+
+const suite = new Benchmark.Suite()
+suite
+  .add('#缓存整个xdb数据【搜索218.4.167.70】', async () => {
+    const ip = '218.4.167.70'
+    return searcher1.search(ip)
+  })
+  .add('#缓存VectorIndex索引【搜索218.4.167.70】', async () => {
+    const ip = '218.4.167.70'
+    return searcher2.search(ip)
+  })
+  .add('#完全基于文件的查询【搜索218.4.167.70】', async () => {
+    const ip = '218.4.167.70'
+    return searcher3.search(ip)
+  })
+  .on('cycle', function (event) {
+    console.log(String(event.target)) // eslint-disable-line
+  })
+  .on('complete', function () {
+    console.log('Fastest is ' + this.filter('fastest').map('name')) // eslint-disable-line
+  })
+  .run({ async: true })
diff --git a/binding/nodejs/tests/function.test.js b/binding/nodejs/tests/function.test.js
new file mode 100644
index 0000000..bdfd524
--- /dev/null
+++ b/binding/nodejs/tests/function.test.js
@@ -0,0 +1,33 @@
+/*
+ * Created by Wu Jian Ping on - 2022/07/22.
+ */
+
+const { expect } = require('chai')
+const path = require('path')
+const Searcher = require('..')
+
+const dbPath = path.join(__dirname, '..', '..', '..', 'data', 'ip2region.xdb')
+const buffer = Searcher.loadContentFromFile(dbPath)
+const searcher1 = Searcher.newWithBuffer(buffer)
+
+const vectorIndex = Searcher.loadVectorIndexFromFile(dbPath)
+const searcher2 = Searcher.newWithVectorIndex(dbPath, vectorIndex)
+
+const searcher3 = Searcher.newWithFileOnly(dbPath)
+
+describe('ip2region', () => {
+  it('#newWithFileOnly and search', async () => {
+    const d = await searcher3.search('218.4.167.70')
+    expect(d.region).equal('中国|0|江苏省|苏州市|电信')
+  })
+
+  it('#newWithVectorIndex and search', async () => {
+    const d = await searcher2.search('218.4.167.70')
+    expect(d.region).equal('中国|0|江苏省|苏州市|电信')
+  })
+
+  it('#newWithBuffer and search', async () => {
+    const d = await searcher1.search('218.4.167.70')
+    expect(d.region).equal('中国|0|江苏省|苏州市|电信')
+  })
+})
diff --git a/binding/nodejs/tests/test.app.js b/binding/nodejs/tests/test.app.js
new file mode 100644
index 0000000..26abbd0
--- /dev/null
+++ b/binding/nodejs/tests/test.app.js
@@ -0,0 +1,79 @@
+/*
+ * Created by Wu Jian Ping on - 2022/07/22.
+ */
+
+const Searcher = require('../')
+const { ArgumentParser } = require('argparse')
+
+// 处理输入参数
+const parser = new ArgumentParser({
+  add_help: true,
+  description: 'ip2region test app',
+  prog: 'node test.app.js',
+  usage: 'Usage %(prog)s [command options]'
+})
+
+parser.add_argument('--db', { help: 'ip2region binary xdb file path, default: ../../data/ip2region.xdb' })
+parser.add_argument('--cache-policy', { help: 'cache policy: file/vectorIndex/content, default: content' })
+
+const args = parser.parse_args()
+const dbPath = args.db || '../../data/ip2region.xdb'
+const cachePolicy = args.cache_policy || 'content'
+
+// 创建searcher对象
+const createSearcher = () => {
+  let searcher = null
+  let vectorIndex = null
+  let buffer = null
+
+  switch (cachePolicy) {
+    case 'file':
+      searcher = Searcher.newWithFileOnly(dbPath)
+      break
+    case 'vectorIndex':
+      vectorIndex = Searcher.loadVectorIndexFromFile(dbPath)
+      searcher = Searcher.newWithVectorIndex(dbPath, vectorIndex)
+      break
+    default:
+      buffer = Searcher.loadContentFromFile(dbPath)
+      searcher = Searcher.newWithBuffer(buffer)
+  }
+  console.log('options: ')
+  console.log(`    dbPath: ${dbPath}`)
+  console.log(`    cache-policy: ${cachePolicy}`)
+  console.log('')
+  return searcher
+}
+
+// 从控制台读取用户一行输入
+const readlineSync = () => {
+  return new Promise((resolve, reject) => {
+    process.stdin.resume()
+    process.stdin.on('data', data => {
+      process.stdin.pause()
+      resolve(data.toString('utf-8'))
+    })
+  })
+}
+
+const searcher = createSearcher()
+
+const main = async () => {
+  console.log('type \'quit\' to exit')
+  while (true) {
+    process.stdout.write('ip2region>> ')
+    const ip = (await readlineSync()).trim()
+    if (ip === 'quit') {
+      process.exit(0)
+    } else {
+      try {
+        const response = await searcher.search(ip)
+        console.log(response)
+      } catch (err) {
+        console.log(err)
+      }
+    }
+  }
+}
+
+main()