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<!DOCTYPE html>
<html>
<body>
​
<h2>JavaScript Classes are written in "strict mode"</h2>
​
<p>You will get an error if you try to use a variable without declaring it.</p>
​
<script>
class Car {
  constructor(brand) {
    i = 0;
    this.carname = brand;
  }
}
var mycar = new Car("Ford");
</script>
​
<p>Press F12 to see the error description in the console.</p>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_classes_strict_mode by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:39:34 GMT -->
</html>
​
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