<html>
<body>
<p>该实例中, myFunction 是函数构造函数:</p>
<p id="demo"></p>
<script>
function myFunction(arg1, arg2) {
this.firstName = arg1;
this.lastName = arg2;
}
var x = new myFunction("John","Doe")
document.getElementById("demo").innerHTML = x.firstName;
</script>
</body>
</html>