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<!DOCTYPE html>
<html>
<body>
​
<p>Click the button to join three strings into one new string.</p>
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<button onclick="myFunction()">Try it</button>
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<p id="demo"></p>
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<script>
function myFunction() {
  var str1 = "Hello ";
  var str2 = "world!";
  var str3 = " Have a nice day!";
  var res = str1.concat(str2, str3);
  document.getElementById("demo").innerHTML = res;
}
</script>
​
</body>
​
​
</html>
​
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