JSFiddle - React, Tailwind, and code Playground

by annndrewww

HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
</head>
<body>
  <div class="input"></div>
</body>
</html>

JavaScript

let input = document.querySelector('.input')

// Поле вывода математических операции
function insert (num) {
    if(input.textContent == 0) {
        input.textContent = ''
        input.textContent = input.textContent + num
    } else 
    input.textContent = input.textContent + num
}