手写 instanceOf

个人练习，代码如下：

function myInstanceOf(o,type){
    if(typeof o !== 'object' || o === null){
        return false
    }
    if(Object.getPrototypeOf(o) === type.prototype){
        return true
    }else{
        return myInstanceOf(Object.getPrototypeOf(o),type)
    }
}