<!DOCTYPE html>
<html>
<body>
<h1>JavaScript 函数</h1>
<p>全局函数（myFunction）返回参数（a，b）的乘积：</p>
<p id="demo"></p>
<script>
function myFunction(a, b) {
return a * b;
}
document.getElementById("demo").innerHTML = myFunction(10, 2);
</script>
</body>
</html>