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/**
 * 生成指定位数的随机数
 * @param {number} x
 */
export const randomStr = (x) => {
  let s = "";
  while(s.length < x && x > 0){
    let v = Math.random() < 0.5 ? 32 : 0;
    s += String.fromCharCode(Math.round(Math.random() * ((122 - v) - (97 - v)) + (97 - v)));
  }

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let num = 123456.1234

num.toLocaleString('zh-Hans-CN', { style: 'currency', currency: 'CNY' })
// ￥123,456.12

num.toLocaleString('en-US', { style: 'currency', currency: 'USD' })
// $123,456.12

num.toLocaleString('zh', { style: 'decimal', minimumFractionDigits: 2, maximumFractionDigits: 2 })
// 123,456.12

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" 显示行号
set number

" 显示标尺
set ruler

" 历史纪录
set history=1000

" 输入的命令显示出来，看的清楚些

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const UniversalUser = universal(() => import('./User'), {
  resolve: () => require.resolveWeak('./User'),
  loading: <Loading />
})

const User = ({ loading, error, user }) =>
  <div>
    <UniversalUser isLoading={loading} error={error} user={user} />
  </div>

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$vu_base: 375 // iphone6

@function vu($px) {
  @return ($px / $vu_base) * 100vw
}

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const bcrypt = require('bcrypt')
const jwt = require('jsonwebtoken')
const config = require('../config/security')

function hashPassword(password) {
  return new Promise((resolve, reject) => {
    bcrypt.genSalt(config.saltRounds)
      .then(salt => {
        return bcrypt.hash(password, salt)
      })

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const container = document.getElementById('js-list');
if (!container) {
  return
}

const total = 10000
const batchSize = 4 // 每次插入多少个结点，越大越卡
const batchCount = total / batchSize // 插入次数
let batchDone = 0 // 已经完成的批处理个数

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const arr = ['aaa', 'bbb', 'aaa', '111'];
const uniqueArr = arr.filter((item, index) => {
	return arr.indexOf(item) === index;
});

console.log(uniqueArr);       // ['aaa', 'bbb', '111']

const simpleUnique = function(arr) {
	return [...new Set(arr)]
}

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const arr = [
  {"name": "Kate", "age": 22},
  {"name": "Candy", "age": 21},
  {"name": "Petty", "age": 20}
];

arr.sort(compare('name'))      // {"name": "Candy", "age": 21}, {"name": "Kate", "age": 22}, {"name": "Petty", "age": 20}
arr.sort(compare('age'));      // {"name": "Petty", "age": 20}, {"name": "Candy", "age": 21}, {"name": "Kate", "age": 22}

function compare(key) {

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var a = [1, 2, 3];
var b = a;
a = [];
console.log(a);    // []
console.log(b);    // [1,2,3]

a = [] 方式清除 a 变量数组引用其变量 b 的数组不变