libcu

libcu aim to provide a common use lib for JavaScript

libcu致力于提供一个JS的通用方法库

example

const libcu = require('libcu');
console.log(libcu.tools.sleep(100));

APIS & Usage

const libcu = require('libcu')

I.tools

• 1.findLackNumArr(arr)

  Find the missing number in a contiguous array

  在连续的数组里面找到缺少的数字

  let a = [1,2,4,6,10];
  a = libcu.tools.findLackNumArr(a);
  console.log(a);
  '[ 3, 5, 7, 8, 9 ]'

• 2.sleep(ms)

  async sleep

  异步睡眠函数

  await libcu.tools.sleep(1000);

• 3.contains(arr, obj)

  Judge whether obj is in arr

  判断obj是否在arr里面

  ([1,2,3] , 1) will return true

  let a = [1,2,4,6,10];
  let b = 3;
  console.log(libcu.tools.contains(a,b));
  'false'

• 4.ascii2Hex(buf)

  omited

• 5.hex2Ascii(buf)

  omited

• 6.padZero(num, len)

  Left padding zero, len is the number of zeros

  左补零，len为补0的个数

  let a = 1;
  let b = libcu.tools.padZero(a,3);
  console.log(b);
  '001'

• 7.padZero(num, len)

  Hexadecimal left padding zero

  十六进制左补零

  let a = 1;
  let b = libcu.tools.padZero16(a,3);
  console.log(b);
  '001'

• 8.buf2String(buf)

  let a =  Buffer.alloc(10)
  a.fill('wtx',0,10);
  console.log(libcu.tools.buf2String(a));
  'wtxwtxwtxw'

• 9.readUInt24BE(inBuf, begin, end)

  In part, it is similar to readUInt32BE

  部分和readUInt32BE类似

  let a =  Buffer.alloc(10)
  a.fill('wtx',0,10);
  let b = libcu.tools.readUInt24BE(a);
  console.log(libcu.tools.buf2String(b));
  '7828600'

• 10.str2arr(str,flag)

  !flag : '[1,2,3]' to [1,2,3]

  flag : '["1","2","3"]' to [1,2,3]

  let a = '[1,2,3]';
  let b = libcu.tools.str2arr(a);
  console.log(b);
  `[ '1', '2', '3' ]`

• 11.acc2Decimal(value)

  1.1 to 1.10

  1 to 1.00

  1.10 to 1.10

  let a = 1.2;
  console.log(libcu.tools.acc2Decimal(a));
  '1.20'

• 12.isNumber(value)

  let a = '1.4f'
  console.log(libcu.tools.isNumber(a));
  'false'

• 13.safeJsonStringfy(json)

  let a = "1"
  console.log(libcu.tools.safeJsonStringfy(a));
  '1'

• 14.safeJsonParse(json)

  let a = "1"
  console.log(libcu.tools.safeJsonParse(a));
  '1'

• 15.delQuotation(number)

  let a = `"1"`
  console.log(libcu.tools.delQuptation(a));
  '1'

• 16.antiJsonStick(string)

  Handle sticky packets, only for JSON type packets.

  处理粘包用，仅限于JSON类型报文

  
  let a = '{a:1}{b:2}';
  
  console.log(a);
  
  
  let arr = libcu.tools.antiJsonStick(a);
  
  console.log(arr);
  {a:1}{b:2}
  [ '{a:1}', '{b:2}' ]
  

II.cf

The main API is the following

• 1.async walkFolder(dirname, option)

  Get all the files and folders in the directory

  获取目录下的所有文件和文件夹

  return {
      fileList : [],
      dirList : []
  }

• 2.async copyFolder(srcDir, tarDir, filter)

  Copy entire directory

  复制整个目录

III.mysql

• 1.init(connect)

  Tell MySQL connection information

  告诉mysql连接信息

      connect : {
          "host" : "127.0.0.1",
          "user" : "test",
          "password":"123456",
          "database" : "mydb",
      }

• 2.async beginTrans()

  Start a transaction

  开启一段事务

  usage:

  try {
      let conn = await beginTrans();
  }catch(error) {
  
  }

• 3.async dbop(sql, sqlParam)

  try {
  let res = await dbop('select * from test');
  } catch(error) {
        
  }
  

• 4.async dbOpInTrans(sql, sqlParam, connection)

• 5.async commit(conn)

• 6.async rollback(conn)

  
  try {
      let conn = await beginTrans();
      try {
          await dbOpInTrans(sql,sqlParam,conn);
          await commit(conn);
      }catch (error) {
          await rollback(conn);
      }
  }catch(error) {
  
  }
  

IV.cipher

• 1.getMd5Buffer(data)

  let a = 1.2
  console.log(libcu.cipher.getMd5Buffer(a));
  '<Buffer 56 76 54 72 68 04 01 49 9c 79 73 24 68 ba 43 40>'

• 2.getMd5Str(data)

  let a = 1.2
  console.log(libcu.cipher.getMd5Str(a));
  '56765472680401499c79732468ba4340'

• 3.getMd5UpperStr(data)

  let a = 1.2
  console.log(libcu.cipher.getMd5UpperStr(a));
  '56765472680401499C79732468BA4340'

• 4.setAesKey(key)

  defalut is "/GwhjXbE1SCPaIY=" (AvenirLibcu)

• 5.AesEncode(info)

• 6.AesDecode(info)

  let a = 1.2
  let b  = libcu.cipher.AesEncode(a);
  console.log(b);
  let c = libcu.cipher.AesDecode(b);
  console.log(c);
  'b = rXtFTnkfN1IXmvO94PoeQA=='
  'c = 1.2'