<!DOCTYPE html>
<html>
<body>
<h2>JavaScript 箭头函数</h2>
<p>此例展示了带参数的箭头函数。</p>
<p id="demo"></p>
<script>
var hello;
hello = (val) => "Hello " + val;
document.getElementById("demo").innerHTML = hello("Universe!");
</script>
</body>
</html>