instanceof 运算符用于检测构造函数的 prototype 属性是否出现在某个实例对象的原型链上。
object instanceof constructortypeof 运算符返回一个字符串，表示操作数的类型。
typeof operandconsole.log('-------------------- instanceof -------------------')
// typeof check if an object is an instance of a particular constructor
// check the prototype chain of the object to determine if the constructor appears in it
// create a constructor function
function Person(name) {
this.name = name
}
const person = new Person('John');
console.log(person instanceof Person) // true
console.log(person instanceof Object) // true
console.log([] instanceof Array) // true
console.log('-------------------- typeof -------------------');
// typeof is used to determine the type of a value or variable.
// It returns a string indicating the type of the operand.
console.log(typeof 42) //number
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