<!DOCTYPE html>
<html lang="en">
<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>手写 instanceof 第二遍</title>
</head>
<body>
<script>
class Person {
constructor(name, age) {
this.name = name;
this.age = age;
}
}
let person1 = new Person('彭', 29);
let person2 = Reflect.construct(Person, ['陈', '18']);
console.log(person1 instanceof Person);
console.log(person2 instanceof Person);
function myInstanceOf(obj, className) {
let pointer = obj;
while (pointer) {
if (pointer === className.prototype) {
return true;
}
pointer = Reflect.getPrototypeOf(pointer);
}
return false;
}
console.log(myInstanceOf(person1, Person));
</script>
</body>
</html>
