Tính tổng 2 số javascript 2
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </head> <body> <h1>Tính tổng 2 số javascript 2</h1> <input type="text" id="num1" value="0"/> <input type="text" id="num2" value="0"/> <br/> <span id="result"></span> <br/> <input type="button" onclick="sum()" value="Tính tổng"/> <script> function sum(){ let a = Number(document.getElementById("num1").value); let b = Number(document.getElementById("num2").value); let sum = parseInt(a) + b; document.getElementById('result').innerHTML = sum; } </script> </body> </html>
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