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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Calculadora JavaScript</title>
<link rel="stylesheet" href="./style.css">
</head>
<body>
<div class="togglebtn"></div>
<div class="calculadora">
<div class="botoes">
<h2 id="valor"></h2>
<span id="clear">Clear</span>
<span id="divisao">/</span>
<span id="multiplicacao">*</span>
<span>1</span>
<span>2</span>
<span>3</span>
<span id="subtracao">-</span>
<span>4</span>
<span>5</span>
<span>6</span>
<span id="soma">+</span>
<span>7</span>
<span >8</span>
<span id="nove">9</span>
<span>0</span>
<span>00</span>
<span id="ponto">.</span>
<span id="igual">=</span>
</div>
</div>
<script>
let botoes = document.querySelector('.botoes');
let btn = document.querySelectorAll('span');
let valor = document.getElementById('valor');
let togglebtn = document.querySelector('.togglebtn')
let body = document.querySelector("body");
for(let i=0; i<btn.length; i++){
// loop para ler e verificar a acao a ser tomada apos o click de cada botao
btn[i].addEventListener("click",function(){
if(this.innerHTML=="="){
// realiza a operacao lida pelo queryselector
valor.innerHTML= eval(valor.innerHTML);
}else{
if(this.innerHTML=="Clear"){
// acao ao clicar no botao clear
valor.innerHTML = "0";
}
else{
// adiciona os elementos à operacao
valor.innerHTML += this.innerHTML;
}
}
})
}
togglebtn.onclick = function(){
body.classList.toggle('dark');
}
</script>
</body>
</html>