<!DOCTYPE html>
<html>
<body>
What color do you prefer?<br>
<input type="radio" name="colors" id="1">Red<br>
<input type="radio" name="colors" id="2">Blue
<script>
function myFunction() {
var x = document.getElementById("1").checked;
if (x==false)
{document.getElementById("demo").innerHTML="Chọn red ku";}
else
{
document.getElementById("demo").innerHTML =x;}}
</script>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
</body>
</html>
<html>
<body>
What color do you prefer?<br>
<input type="radio" name="colors" id="1">Red<br>
<input type="radio" name="colors" id="2">Blue
<script>
function myFunction() {
var x = document.getElementById("1").checked;
if (x==false)
{document.getElementById("demo").innerHTML="Chọn red ku";}
else
{
document.getElementById("demo").innerHTML =x;}}
</script>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
</body>
</html>
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