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    circleClickHandler() {
      let level = this.curExpendLevel
      if (level < 2 && (level > this.lastExpendLevel || level === 0)) {
        level++
      } else {
        level--
      }
      this.lastExpendLevel = this.curExpendLevel
      this.curExpendLevel = level
    }

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/**
* 使用方法：
* 1. 用 Chrome 打开歌单的 web 页面（可以通过分享拿到链接，链接类似这样：http://music.163.com/playlist?id=xxx&userid=yyy）
* 2. 然后右键“检查”（如果有左上角有 device 选项，需要选择 Laptop 开头的，可以在 Edit/编辑 里添加）
* 3. 在 console 里输入下面脚本，即可输出 “歌曲名 - 歌手名” 格式的内容：

    Springsteen - Eric Church
    Chattahoochee - Alan Jackson
    Baby Now That I Found You - Alison Krauss
    Check Yes or No - George Strait

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const fs = require('fs')
const path = require('path')
const os = require('os')

const Koa = require('koa')
const koaBody = require('koa-body');


const app = new Koa()

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var fileOrPath = /^((((?:\.\/|\.\.\/|\/)?(?:[.\w-_]+\/)*)([.\w-_]+)*),?)+$/

var email = /^[a-z0-9]+([._\\-]*[a-z0-9])*@(?:(?!qq|gmail|163|sina|live|126|yeah|sohu|hotmail|outlook|263|googlemail|yahoo|sogou|21cn|189|aliyun|foxmail|139|10086)[a-z0-9]+[-a-z0-9]*[a-z0-9]+.){1,63}[a-z0-9]+$/

var phone = /^1\d{10}$|^(0\d{2,3}-?|\(0\d{2,3}\))?[1-9]\d{4,7}(-\d{1,8})?$/

var hexstring = /\b[0-9a-fA-F]+\b/

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# https://stackoverflow.com/questions/14678132/python-hexadecimal
iv = '\xf3\xc2\xafw:\r}k'
res = ''
for i in iv:
    res = res + "{:#04x}".format(ord(i)) + ", "

print res

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python -c "import os; print(repr(os.urandom(24)))"

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SEGMENT_SIZE=128
BLOCK_SIZE = 16

cipher = AES.new(KEY, AES.MODE_CFB, IV, segment_size=SEGMENT_SIZE)
dc = dynamic_token.decode("hex")
pt = cipher.decrypt(dc)
print pt

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import json
from base64 import b64encode
from Crypto.Cipher import AES
from Crypto.Random import get_random_bytes

data = "secret"
print(data)
key = get_random_bytes(16)
iv = get_random_bytes(16)
cipher = AES.new(key, AES.MODE_CFB, iv)

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import json
from base64 import b64encode
from Crypto.Cipher import AES
from Crypto.Random import get_random_bytes

data = b"secret"
print(data)
key = get_random_bytes(16)
iv = get_random_bytes(16)
cipher = AES.new(key, AES.MODE_CFB, iv)

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(subprocess.check_output("echo xxx", shell=True).strip()).decode()