Node.js 是一个基于Chrome JavaScript 运行时建立的

目前最大的限制是属性必须是可变的（译者注：即可写的），对象初始化器才能工作：它们首先调用对象的构造函数(本例中是默认的无参数构造函数)，然后赋值给属性 setter。

仅初始化(init-only)属性解决了这个问题！它引入了一个 init 访问器，它是 set 访问器的变体，只能在对象初始化时调用：

public class Person
{
public string FirstName { get; init; }
public string LastName { get; init; }
}
有了这个声明，上面的客户端代码仍然是合法的，但是随后对 FirstName 和 LastName 属性的任何赋值都是错误的。

初始化(init) 访问器和只读(readonly)字段
因为 init 访问器只能在初始化期间调用，所以允许它们更改封闭类的只读(readonly)字段，就像在构造函数中一样。

public class Person
{
private readonly string firstName;
private readonly string lastName;

public string FirstName
{
get => firstName;
init => firstName = (value ?? throw new ArgumentNullException(nameof(FirstName)));
}
public string LastName
{
get => lastName;
init => lastName = (value ?? throw new ArgumentNullException(nameof(LastName)));
}
}
二、记录（record）
译者注：
原文中声明一个记录的 data class ** 联合关键字现在已经变成 record 关键字了，所以翻译过程中做了修正。

如果您想使单个属性不可变，那么仅初始化(init-only)属性是极好的。如果您想要整个对象是不可变的，行为像一个值，那么你应该考虑声明它为一个记录(record)

https://lanfc.com/ask/detail/25520.html

https://lanfc.com/ask/detail/25518.html

https://lanfc.com/ask/detail/25515.html

https://lanfc.com/ask/detail/25511.html

https://lanfc.com/ask/detail/25509.html

https://lanfc.com/ask/detail/25507.html

https://lanfc.com/ask/detail/25497.html

https://lanfc.com/ask/detail/25494.html

https://lanfc.com/ask/detail/25491.html

https://lanfc.com/ask/detail/25486.html

https://lanfc.com/ask/detail/25483.html

https://lanfc.com/ask/detail/25481.html

https://lanfc.com/ask/detail/25477.html

https://lanfc.com/ask/detail/25474.html

https://lanfc.com/ask/detail/25469.html

https://lanfc.com/ask/detail/25467.html

https://lanfc.com/ask/detail/25461.html

https://lanfc.com/ask/detail/25459.html

https://lanfc.com/ask/detail/25455.html

https://lanfc.com/ask/detail/25453.html

https://lanfc.com/ask/detail/25448.html

https://lanfc.com/ask/detail/25444.html

https://lanfc.com/ask/detail/25441.html

https://lanfc.com/ask/detail/25438.html

https://lanfc.com/ask/detail/25435.html

https://lanfc.com/ask/detail/25432.html

https://lanfc.com/ask/detail/25426.html

https://lanfc.com/ask/detail/25423.html

https://lanfc.com/ask/detail/25420.html

https://lanfc.com/ask/detail/25416.html

https://lanfc.com/ask/detail/25412.html

https://lanfc.com/ask/detail/25407.html

https://lanfc.com/ask/detail/25405.html

https://lanfc.com/ask/detail/25402.html

https://lanfc.com/ask/detail/25399.html

https://lanfc.com/ask/detail/25396.html

https://lanfc.com/ask/detail/25393.html

https://lanfc.com/ask/detail/25391.html

https://lanfc.com/ask/detail/25386.html

https://lanfc.com/ask/detail/25383.html

https://lanfc.com/ask/detail/25380.html

https://lanfc.com/ask/detail/25375.html

https://lanfc.com/ask/detail/25373.html

https://lanfc.com/ask/detail/25371.html

https://lanfc.com/ask/detail/25365.html

https://lanfc.com/ask/detail/25362.html

https://lanfc.com/ask/detail/25359.html

https://lanfc.com/ask/detail/25354.html

https://lanfc.com/ask/detail/25352.html

https://lanfc.com/ask/detail/25350.html

https://lanfc.com/ask/detail/25348.html

https://lanfc.com/ask/detail/25345.html

https://lanfc.com/ask/detail/25340.html

https://lanfc.com/ask/detail/25337.html

https://lanfc.com/ask/detail/25334.html

https://lanfc.com/ask/detail/25331.html

https://lanfc.com/ask/detail/25327.html

https://lanfc.com/ask/detail/25325.html

https://lanfc.com/ask/detail/25322.html

https://lanfc.com/ask/detail/25318.html

https://lanfc.com/ask/detail/25316.html

https://lanfc.com/ask/detail/25313.html

https://lanfc.com/ask/detail/25310.html

https://lanfc.com/ask/detail/25308.html

https://lanfc.com/ask/detail/25306.html

https://lanfc.com/ask/detail/25304.html

https://lanfc.com/ask/detail/25302.html

https://lanfc.com/ask/detail/25299.html

https://lanfc.com/ask/detail/25296.html

https://lanfc.com/ask/detail/25293.html

https://lanfc.com/ask/detail/25291.html

https://lanfc.com/ask/detail/25289.html

https://lanfc.com/ask/detail/25287.html

https://lanfc.com/ask/detail/25281.html

https://lanfc.com/ask/detail/25278.html

https://lanfc.com/ask/detail/25276.html

https://lanfc.com/ask/detail/25275.html

https://lanfc.com/ask/detail/25273.html

https://lanfc.com/ask/detail/25271.html

https://lanfc.com/ask/detail/25269.html

https://lanfc.com/ask/detail/25266.html

https://lanfc.com/ask/detail/25265.html

https://lanfc.com/ask/detail/25263.html

https://lanfc.com/ask/detail/25261.html

https://lanfc.com/ask/detail/25259.html

https://lanfc.com/ask/detail/25255.html

https://lanfc.com/ask/detail/25253.html

https://lanfc.com/ask/detail/25250.html

https://lanfc.com/ask/detail/25248.html

https://lanfc.com/ask/detail/25245.html

https://lanfc.com/ask/detail/25243.html

https://lanfc.com/ask/detail/25235.html

https://lanfc.com/ask/detail/25233.html

https://lanfc.com/ask/detail/25229.html

https://lanfc.com/ask/detail/25225.html

https://lanfc.com/ask/detail/25221.html

https://lanfc.com/ask/detail/25218.html

https://lanfc.com/ask/detail/25215.html

https://lanfc.com/ask/detail/25213.html

https://lanfc.com/ask/detail/25211.html

https://lanfc.com/ask/detail/25210.html

https://lanfc.com/ask/detail/25207.html

https://lanfc.com/ask/detail/25204.html

https://lanfc.com/ask/detail/25202.html

https://lanfc.com/ask/detail/25199.html

https://lanfc.com/ask/detail/25195.html

https://lanfc.com/ask/detail/25191.html

https://lanfc.com/ask/detail/25188.html

https://lanfc.com/ask/detail/25186.html

https://lanfc.com/ask/detail/25184.html

https://lanfc.com/ask/detail/25180.html

https://lanfc.com/ask/detail/25179.html

https://lanfc.com/ask/detail/25177.html

https://lanfc.com/ask/detail/25175.html

https://lanfc.com/ask/detail/25174.html

https://lanfc.com/ask/detail/25173.html

https://lanfc.com/ask/detail/25171.html

https://lanfc.com/ask/detail/25168.html

https://lanfc.com/ask/detail/25165.html

https://lanfc.com/ask/detail/25163.html

https://lanfc.com/ask/detail/25159.html

https://lanfc.com/ask/detail/25157.html

https://lanfc.com/ask/detail/25154.html

https://lanfc.com/ask/detail/25151.html

https://lanfc.com/ask/detail/25147.html

https://lanfc.com/ask/detail/25145.html

https://lanfc.com/ask/detail/25140.html

https://lanfc.com/ask/detail/25135.html

https://lanfc.com/ask/detail/25132.html

https://lanfc.com/ask/detail/25128.html

https://lanfc.com/ask/detail/25125.html

https://lanfc.com/ask/detail/25122.html

https://lanfc.com/ask/detail/25119.html

https://lanfc.com/ask/detail/25115.html

https://lanfc.com/ask/detail/25112.html

https://lanfc.com/ask/detail/25109.html

https://lanfc.com/ask/detail/25102.html

https://lanfc.com/ask/detail/25100.html

https://lanfc.com/ask/detail/25098.html

https://lanfc.com/ask/detail/25094.html

https://lanfc.com/ask/detail/25091.html

https://lanfc.com/ask/detail/25088.html

https://lanfc.com/ask/detail/25085.html

https://lanfc.com/ask/detail/25084.html

https://lanfc.com/ask/detail/25082.html

https://lanfc.com/ask/detail/25080.html

https://lanfc.com/ask/detail/25079.html

https://lanfc.com/ask/detail/25077.html

https://lanfc.com/ask/detail/25075.html

https://lanfc.com/ask/detail/25074.html

https://lanfc.com/ask/detail/25073.html

https://lanfc.com/ask/detail/25071.html

https://lanfc.com/ask/detail/25068.html

https://lanfc.com/ask/detail/25067.html

https://lanfc.com/ask/detail/25066.html

https://lanfc.com/ask/detail/25065.html

https://lanfc.com/ask/detail/25064.html

https://lanfc.com/ask/detail/25063.html

https://lanfc.com/ask/detail/25062.html

https://lanfc.com/ask/detail/25060.html

https://lanfc.com/ask/detail/25059.html

https://lanfc.com/ask/detail/25057.html

https://lanfc.com/ask/detail/25055.html

https://lanfc.com/ask/detail/25054.html

https://lanfc.com/ask/detail/25053.html

https://lanfc.com/ask/detail/25051.html

https://lanfc.com/ask/detail/25049.html

https://lanfc.com/ask/detail/25048.html

https://lanfc.com/ask/detail/25047.html

https://lanfc.com/ask/detail/25046.html

https://lanfc.com/ask/detail/25045.html

https://lanfc.com/ask/detail/25044.html

https://lanfc.com/ask/detail/25043.html

https://lanfc.com/ask/detail/25042.html

https://lanfc.com/ask/detail/25041.html

https://lanfc.com/ask/detail/25039.html

https://lanfc.com/ask/detail/25037.html

https://lanfc.com/ask/detail/25034.html

https://lanfc.com/ask/detail/25033.html

https://lanfc.com/ask/detail/25032.html

https://lanfc.com/ask/detail/25031.html

https://lanfc.com/ask/detail/25029.html

https://lanfc.com/ask/detail/25028.html

https://lanfc.com/ask/detail/25027.html

https://lanfc.com/ask/detail/25026.html

https://lanfc.com/ask/detail/25025.html

https://lanfc.com/ask/detail/25024.html

https://lanfc.com/ask/detail/25022.html

https://lanfc.com/ask/detail/25020.html

https://lanfc.com/ask/detail/25019.html

https://lanfc.com/ask/detail/25018.html

https://lanfc.com/ask/detail/25016.html

https://lanfc.com/ask/detail/25015.html

https://lanfc.com/ask/detail/25013.html

https://lanfc.com/ask/detail/25011.html

https://lanfc.com/ask/detail/25010.html

https://lanfc.com/ask/detail/25007.html

https://lanfc.com/ask/detail/25006.html

https://lanfc.com/ask/detail/25005.html

最后

以上就是平常黑夜为你收集整理的Node.js 是一个基于Chrome JavaScript 运行时建立的的全部内容，希望文章能够帮你解决Node.js 是一个基于Chrome JavaScript 运行时建立的所遇到的程序开发问题。

如果觉得靠谱客网站的内容还不错，欢迎将靠谱客网站推荐给程序员好友。