<!DOCTYPE html>
<html>
<body>
<h2>JavaScript 箭头函数</h2>
<p>箭头函数在 IE11 或更早版本中不受支持。</p>
<p id="demo"></p>
<script>
const x = (x, y) => { return x * y };
document.getElementById("demo").innerHTML = x(5, 5);
</script>
</body>
</html>