JSFiddle - React, Tailwind, and code Playground

by ha ha

HTML

<button id="btn" onclick="randomGo(45, 1)">button</button>
    <div id="randomNumber"></div>

CSS

button{
  width: 100px;
  height: 50px;
  background: #336699;
  font-size: 14px;
  border-radius: 5px;
  margin-bottom: 30px;
  border: 0;
  color: #fff;
  }

JavaScript

function randomGo(max, min){
   let randomNum = '';
   let numArray = [];
   let numIndex = 0;

   while(numArray.length < 7){
     randomNum = Math.floor(Math.random()*(max-min+1))+min; 
     if(numArray.indexOf(randomNum) == -1){
       numArray[numIndex] = randomNum;
       numIndex++;
     }
   }

   document.getElementById('randomNumber').innerText = numArray;
 }