javascript - 在 JavaScript 中从数组中的对象访问变量？

Question

我想要实现的是:

1. 声明一个将容纳所有项目的数组。
2. 构造函数创建一个对象，该对象将成为一个新项目。然后，构造函数立即将其推送到 allProject 数组。
3. 然后，我想在对象已位于数组中后显示对象中的某些变量，例如 ._hours。

我的代码需要:

//Declare Array that will Host Projects
const allProjects = [];

//Create Parent Class that creates objects (Project)
class Project {

constructor(projTitle, projDescription, projHours) {

    //Declare variables
    this._name = projTitle;
    this._description =  projDescription;
    this._hours = projHours;

    //Send newly constructed object directly to next space in array.
    allProjects.push(constructor(projTitle, projDescription, projHours));

    }
}

//Create new object.
const DataEntry = new Project('Data Entry', 'Enter Data into Amazon', '4 Hours');

//Display the name variable housed in the object that was pushed into allProjects array.
console.log(allProjects[0].DataEntry._name);

输出如下所示:

/Users/ervin/WebstormProjects/untitled/Project Management.js:30
console.log(allProjects[0].DataEntry._name);
                                 ^

TypeError: Cannot read property '_name' of undefined
    at Object.<anonymous> (/Users/ervin/WebstormProjects/untitled/Project 
Management.js:30:38)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Function.Module.runMain (module.js:693:10)
    at startup (bootstrap_node.js:191:16)
    at bootstrap_node.js:612:3

Process finished with exit code 1

我们会考虑并感谢任何帮助。如果我需要澄清任何事情，请告诉我。

Answer 1

在构造函数中更新此行

allProjects.push(this);

我测试了它，它按照你的预期工作。