检查对象是否包含 Javascript 中称为 format 的属性

Question

我在 Web 应用程序中有一个电影对象数组，每个对象都有 title(string)、release year(int)、rating(int) 和 genre(an array of string e.g ['Action','Sci-Fi] 的属性，现在一些电影对象有 format(string) 的属性而其他人则没有。我所需要的只是帮助遍历这些对象并检查哪些对象没有format 属性并将该属性添加到这些对象并使用Film 为那些没有的对象设置值.. . 这是我到目前为止尝试的js代码

var fractured={
  title:"Fractured",
  release:2019,
  rating:8,
  format:"digital",
  genre:[
    "Mystery","Sci-Fi","Western"]
};
var countdown={
  title:"Countdown",
  release:2018,
  rating:5,
  genre:["Sci-Fi","Mystery","Western"]
}
var bloodshot={
  title:"Bloodshot",
  release:2020,
  rating:6,
  format:"digital",
  genre:["Sci-Fi","Action"]
}
var revenant={
  title:"Revenant",
  release:2015,
  rating:3,
  genre:["History","Western","Action"]
}
var crisis={
  title:"Crisis",
  release:2016,
  rating:10,
  genre:["Action","Drama","Reality"]
}
var life={
  title:"Life",
  release:2017,
  rating:9,
  format:"digital",
  genre:["Sci-Fi","Action","Mystery"]
}
var nmovies=new Array(fractured,life,crisis,revenant,bloodshot,countdown);

//This line outputs the title property of the first object in nmovies;
console.log(nmovies[0].title);

//this is the iteration that needs to check if an object has a format property and add it with the value 'Film'
nmovies.forEach(myfunction());

function myfunction(item, index){
//Code to check please
}

感谢您的意见。

Answer 1

我是 JavaScript 新手，但希望它可以工作。

function myfunction(item, index) {
  if (!item.hasOwnProperty("format")) {
    item.format = "Film";
  }
}