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calculator.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Calculator</title>
</head>
<body>
<p>
<button onclick="
updateCalculation('1');
">1</button>
<button onclick="
updateCalculation('2');
">2</button>
<button onclick="
updateCalculation('3');
">3</button>
<button onclick="
updateCalculation(' + ');
">+</button>
</p>
<p>
<button onclick="
updateCalculation('4');
">4</button>
<button onclick="
updateCalculation('5');
">5</button>
<button onclick="
updateCalculation('6');
">6</button>
<button onclick="
updateCalculation(' - ');
">-</button>
</p>
<p>
<button onclick="
updateCalculation('7');
">7</button>
<button onclick="
updateCalculation('8');
">8</button>
<button onclick="
updateCalculation('9');
">9</button>
<button onclick="
updateCalculation(' * ');
">*</button>
</p>
<p>
<button onclick="
updateCalculation('0');
">0</button>
<button onclick="
updateCalculation('.');
">.</button>
<button onclick="
// Note: eval() takes a string and runs it as code.
// Avoid using eval() in real world projects since
// it can potentially be given harmful code to run.
// Only use eval() for learning purposes.
calculation = eval(calculation);
console.log(calculation);
">=</button>
<button onclick="
updateCalculation(' / ');
">/</button>
</p>
<p>
<button onclick="
calculation = '';
console.log(calculation);
">Clear</button>
</p>
<script>
let calculation = JSON.parse(localStorage.getItem('calculation'));
console.log(calculation)
function updateCalculation(value) {
calculation += value;
console.log(calculation);
}
localStorage.setItem('calculation', JSON.stringify(calculation));
console.log()
</script>
</body>
</html>