Javascript: 实例化对象数组的最佳方式

Question

最简单的是用构造函数创建的大量对象填充数组？

我有一个构造函数，而不是制作电视和电影对象：

function Media(name, boxCover) {
    this.name = name;
    this.boxCover = boxCover;
};

我正在制作许多要放入数组中的对象。这不起作用：

var table = [
var avengers = new Media("avengers",'../assets/boxcovers/avengers.jpg');
var blade_runner = new Media("blade_runner",'../assets/boxcovers/blade_runner.jpg');
var brave = new Media("brave",'../assets/boxcovers/brave.jpg');
var catching_fire = new Media("catching_fire",'../assets/boxcovers/catching_fire.jpg');
var django = new Media("django",'../assets/boxcovers/django.jpg');
var finding_nemo = new Media("finding_nemo",'../assets/boxcovers/finding_nemo.jpg');
];

我也试过把table.push(放在每行的开头。我真的需要像这样在数组中再次列出每个对象，或者我可以节省重复的工作：

table = [avengers, blade_runner, etc.

Answer 1

语法为

var table = {
    mykey: myproperty,
    mykey2: myproperty2
};

如果您希望您的变量是一个对象，即您可以通过调用 f.e table.avengers 来访问属性，您的声明应该如下所示：

var table = {
    avengers: new Media("avengers",'../assets/boxcovers/avengers.jpg'),
    blade_runner: new Media("blade_runner",'../assets/boxcovers/blade_runner.jpg'),
    brave: new Media("brave",'../assets/boxcovers/brave.jpg')
    //... and so on and so forth
};

如果只想循环遍历它们，可以将其创建为数组：

var table = [
    new Media("avengers",'../assets/boxcovers/avengers.jpg'),
    new Media("blade_runner",'../assets/boxcovers/blade_runner.jpg'),
    new Media("brave",'../assets/boxcovers/brave.jpg')
    //... and so on and so forth
];

Answer 2

您使用了错误的语法。试试这个：

function Media(name, boxCover) {
    this.name = name;
    this.boxCover = boxCover;
};

var table = [
 new Media('avengers','../assets/boxcovers/avengers.jpg'),
 new Media('blade_runner','../assets/boxcovers/blade_runner.jpg')         
];

Answer 3

像这样重写你的 var table，这就是所有需要的：

var table = [
  new Media("avengers",'../assets/boxcovers/avengers.jpg'),
  new Media("blade_runner",'../assets/boxcovers/blade_runner.jpg'),
  new Media("brave",'../assets/boxcovers/brave.jpg'),
  new Media("catching_fire",'../assets/boxcovers/catching_fire.jpg'),
  new Media("django",'../assets/boxcovers/django.jpg'),
  new Media("finding_nemo",'../assets/boxcovers/finding_nemo.jpg')
];

Answer 4

您也可以使用简单的语法，例如：

var mediatable = [];
var entry = {
    name: {},
    boxCover: {}
};
mediatable.push({
    name: "avengers",
    boxCover: '../assets/boxcovers/avengers.jpg'
});
mediatable.push({
    name: "blade_runner",
    boxCover: '../assets/boxcovers/blade_runner.jpg'
});
alert(mediatable.length);

或使用对象推送它：

entry.name = "brave";
entry.boxCover = '../assets/boxcovers/brave.jpg';
mediatable.push(entry);
alert(mediatable.length + ":" + mediatable[1].name);

Answer 5

function Media(name, boxCover) {
    this.name = name;
    this.boxCover = boxCover;
};

function MediaTable(data) {
    var table = {};
    data.forEach(function(el){
        table[el[0]] = new Media(el[0], el[1])
    })

    return table;
};

var tableData = [
        ["avengers", '../assets/boxcovers/avengers.jpg'],
        ["blade_runner", '../assets/boxcovers/blade_runner.jpg'],
        ["brave" , '../assets/boxcovers/brave.jpg'],
        ["catching_fire", '../assets/boxcovers/catching_fire.jpg'],
        ["django", '../assets/boxcovers/django.jpg'],
        ["finding_nemo", '../assets/boxcovers/finding_nemo.jpg']
    ],
    table = new MediaTable(tableData);

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