상용 방법 봉인

;(function(doc,win){
  let docEl = document.documentElement || document.body
  let resizeEvt = "orientationchange" in win ? 'orientationchange' : 'resize'
  let resizeFn = () => {
    let clientW = docEl.clientWidth
    if(!clientW) return
    docEl.style.fontSize = 200 * (clientW / 750) + 'px'
  }
  if(!doc.addEventListener) return;
  win.addEventListener(resizeEvt, resizeFn, false)
  doc.addEventListener("DOMContentLoaded", resizeFn, false)
})(document,window)

function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min + 1) + min)
}

function shuffle(arr) {
  let [ ..._arr ]= arr
   // let _arr = arr.concat()
   // let _arr = arr.slice()
  for (let i = 0; i < _arr.length; i++) {
    let j = getRandomInt(0, i)
    let t = _arr[i]
    _arr[i] = _arr[j]
    _arr[j] = t
  }
  return _arr
}

export function userBrowser(){
    var browserName = navigator.userAgent.toLowerCase();
    if (/msie/i.test(browserName) && !/opera/.test(browserName)) {
        console.log("IE");
    } else if (/firefox/i.test(browserName)) {
        console.log("Firefox");
    } else if (/chrome/i.test(browserName) && /webkit/i.test(browserName) && /mozilla/i.test(browserName)) {
        console.log("Chrome");
    } else if (/opera/i.test(browserName)) {
        console.log("Opera");
    } else if (/webkit/i.test(browserName) && !(/chrome/i.test(browserName) && /webkit/i.test(browserName) && /mozilla/i.test(browserName))) {
        console.log("Safari");
    } else {
        console.log(" !");
    }
}

export const randomStr = (system=10, length=6) => {
  return Math.random().toString(system).substr(2).slice(0, length)
} 

function randomWord(randomFlag, min, max) {
  var str = "",
    range = min,
    arr = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'];

  //  
  if (randomFlag) {
    range = Math.round(Math.random() * (max - min)) + min;
  }
  for (var i = 0; i < range; i++) {
    pos = Math.round(Math.random() * (arr.length - 1));
    str += arr[pos];
  }
  return str;
}