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<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript 类方法</h1>
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<p>将参数传递给 "age()" 方法。</p>
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<p id="demo"></p>
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<script>
class Car {
  constructor(name, year) {
    this.name = name;
    this.year = year;
  }
  age(x) {
    return x - this.year;
  }
}
​
let date = new Date();
let year = date.getFullYear();
​
let myCar = new Car("Ford", 2014);
document.getElementById("demo").innerHTML=
"My car is " + myCar.age(year) + " years old.";
</script>
​
</body>
</html>
​