typescript 为什么要在 angular4 的打字稿类的字段中添加下划线？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/45167199/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Why are underscores added to fields of a typescript class in angular4?
提问by Dan
I am building an Angular4project and using IntelliJ. Whenever I create a new class, and then add gettersand setters. The IDE adds underscores to the fields.
我正在构建一个Angular4项目并使用IntelliJ。每当我创建一个新类，然后添加getter和setter。IDE 会向字段添加下划线。
Being that typescript syntax seems to be recognised automatically by the IDE and yet creates the fields in this way, leaves me to think that this is a best practice, but I have also read that this should not be done.
由于打字稿语法似乎被 IDE 自动识别，但仍以这种方式创建字段，这让我认为这是最佳实践，但我也读到不应该这样做。
Why does the IDE do this? And should I allow it to do this for an angular project? Thanks for any help!
为什么 IDE 会这样做？我应该允许它为角度项目执行此操作吗？谢谢你的帮助！
Before creating the getters and setters
在创建 getter 和 setter 之前
export class Test {
hello:string;
world:string;
}
After creating the getters and setters
创建 getter 和 setter 之后
export class Test {
private _hello:string;
private _world:string;
get hello(): string {
return this._hello;
}
set hello(value: string) {
this._hello = value;
}
get world(): string {
return this._world;
}
set world(value: string) {
this._world = value;
}
}
回答by Max Koretskyi
The getter/setter cannot have the name that matches the property name - the following won't work:
getter/setter 的名称不能与属性名称匹配 - 以下将不起作用：
class A {
get world() {
return this.world;
}
}
So the general pattern is to name the internal properties just like a setter/getter only with the edition of an underscore:
所以一般的模式是像 setter/getter 一样命名内部属性，只使用下划线的版本：
class A {
get world() {
return this._world;
}
}
Since JS and therefore TS lacks runtime encapsulation, an underscore usually signifies internal/private/encapsulated property/variable.
由于 JS 和 TS 缺乏运行时封装，下划线通常表示内部/私有/封装的属性/变量。
But nothing forces you to use underscores. If you name your getter/setter differently, you can avoid adding underscores:
但是没有什么会强迫您使用下划线。如果您以不同的方式命名 getter/setter，则可以避免添加下划线：
class A {
get getWorld() {
return this.world;
}
}
回答by lena
You can specify a different prefix to be used for fields in Settings | Editor | Code Style | TypeScript | Code Generation, Naming conventions/Field prefix. But note that leaving the prefix empty will result in TS2300:Duplicate identifiererrors
您可以指定要用于场不同的前缀Settings | Editor | Code Style | TypeScript | Code Generation，Naming conventions/Field prefix。但请注意，将前缀留空会导致TS2300:Duplicate identifier错误
