<!DOCTYPE html>
<html>
<body>
<p>本例调用一个执行计算的函数，并返回结果：</p>
<p id="demo"></p>
<script>
var x = myFunction(4, 3);
function myFunction(a, b) {
return a * b;
}
document.getElementById("demo").innerHTML = x;
</script>
</body>
</html>