11、JavaScript 对象创建模式与音频文件加载抽象

JavaScript 对象创建模式与音频文件加载抽象

1. 动态对象扩展

在 JavaScript 中，我们可以使用工厂函数为对象属性创建默认值。例如：

function makeRecord(title, artist, year) {
  let record = {};
  record.title = title;
  record.artist = artist;
  record.year = year;
  record.fullAlbum = true;
  return record;
}
let weAreHardcore = makeRecord("We Are Hardcore", "The Psycho Electros", 2030);
console.log(weAreHardcore.fullAlbum); // true

工厂函数还可以包含方法，示例如下：

function makeRecord(title, artist, year) {
  let record = {};
  record.title = title;
  record.artist = artist;
  record.year = year;
  record.summary = function() {
    return "Title:" + record.title + ". Artist:" + record.artist + ". Year:" + record.year;
  };