为什么会输出今年男岁了而不是12岁，难道实参要按顺序写吗
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<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
function People(name, age, sex) {
this.name = name;
this.sex = sex;
this.age = age;
};
People.prototype.sayHello = function () {
console.log('你好，我是' + this.name + '，我今年' + this.age + '岁了');
}
People.prototype.sleep = function () {
console.log(this.name + '正在睡觉');
}
function Student(name, sex, age, school, sid) {
People.call(this, name, sex, age);
this.school = school;
this.sid = sid;
};
Student.prototype = new People();
Student.prototype.exam = function () {
console.log(this.name + '正在考试');
}
Student.prototype.sayHello = function () {
console.log('敬礼！你好，我是' + this.name + '，我今年' + this.age + '岁了，我是' + this.school + '的学生');
}
var xiaoming = new Student('小明', '男', 12, '小慕学校', 100066);
xiaoming.sayHello();
xiaoming.sleep();
xiaoming.exam();
</script>
</body>
</html>
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