属性的迭代进入无限循环

var employee = {
  "firstName" : "Krishna",
  "lastName" : "Majety",
  "age" : 29,
  "address" : {
    "city" : "Bangalore",
    "area" : "Marthalli"
  }
}


function printProperties(object, objectName, tab){
  var props = Object.keys(object);

  for(i = 0; i < props.length; i++){
    property = props[i];

    if(object[property] instanceof Object){
      printProperties(object[property], objectName+"."+property, "  " + tab);
    }else{
       console.log(tab + objectName + "." + property + " => " + object[property]); 
    }
  }
}

printProperties(employee, "employee", "")

如果有人能解释这种行为的原因,那就太好了。