<html><head>
<title>无标题文档</title></head><body></body></html><script>
function People() { this.age = 23;
}
People.prototype = { eat: function () {
alert('123');
}
}; function Student(name, skin) {
People.apply(this, arguments);
} var test = new Student('张三', '黄皮肤'); console.log(test.age);
test.eat();</script>为什么test.eat()方法会有错误,但是test.age又能正常输出。
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