创建空构造函数并在类中初始化数组时出现问题

Question

我之前尝试过在构造函数之后移动数组。我很确定此时我的语法错误，我已经尝试研究了很长一段时间但没有运气。任何帮助，将不胜感激。class dataService {  constructor() {  }  //I need to be able to initialize this array of objects and create an empty constructor which does nothing  var data = [ // Error: Construcotr, method, accessor, or property was expected  name1 = { name: "Mitchell", gender: "male", address: "201 Burns Street East", age: 20, phoneNumber: "905-550-7379" },  name2 = { name: "Bob", gender: "male", address: "555 Hello Street", age: 25, phoneNumber: "123-456-7891" },  name3 = { name: "Gillian", gender: "female", address: "457 Baker Street", age: 23, phoneNumber: "555-111-999" }];getData(numRecords) {  numRecords = numRecords || undefined;  if (numRecords == undefined) {    return data;  }};}

Answer 1

嘿，我的朋友，你在如何定义类的属性方面有几个错误，我建议你查看 javascript 类

首先你在数组定义上有错误，这是正确的方法：

  this.data = [ 
  { name: "Mitchell", gender: "male", address: "201 Burns Street East", age: 20, phoneNumber: "905-550-7379" },
   { name: "Bob", gender: "male", address: "555 Hello Street", age: 25, phoneNumber: "123-456-7891" },
  { name: "Gillian", gender: "female", address: "457 Baker Street", age: 23, phoneNumber: "555-111-999" }
];

其次，您可以在构造函数上初始化数组并使用“this”关键字分配给类。