SOURCE

function myInstance(instance,origin){
    if(instance==null) return false

    if(typeof instance !=='function' && typeof instance !=='object'){
        return false//值类型
    }

    let tempInstance=instance
    while(tempInstance){
        if(tempInstance.__proto__==origin.prototype){
            return true//匹配上了
        }
    tempInstance=tempInstance.tempInstance__proto__//顺着原型链查找

    }
    return false
}


console.log(myInstance([],Array))
console.log(myInstance([],Object))
console.log(myInstance({},Object))
console.log(myInstance({},Array))