class Base { protected x: number = 1;}class Derived1 extends Base { protected x: number = 5;}class Derived2 extends Base { f1(other: Derived2) { other.x = 10; } f2(other: Base) { other.x = 10;// Property 'x' is protected and only accessible through an instance ...
strictPropertyInitialization选项控制了类字段是否需要在构造函数里初始化: class BadGreeter { name: string; // Property 'name' has no initializer and is not definitely assigned in the constructor. } class GoodGreeter { name: string; constructor() { this.name = "hello"; } } 注意,字段需要在构造...
class BadGreeter {name: string;// Property 'name' has no initializer and is not definitely assigned in the constructor.setName(): void {this.name = '123'}constructor() {this.setName();}}复制代码 如果你执意要通过其他方式初始化一个字段,而不是在构造函数里(举个例子,引入外部库为你补充类的...
classBadGreeter{name:string;// Property 'name' has no initializer and is not definitely assigned in the constructor.setName():void{this.name='123'}constructor(){this.setName();}} 如果你执意要通过其他方式初始化一个字段,而不是在构造函数里(举个例子,引入外部库为你补充类的部分内容),你可以使用...
classBadGreeter{name:string;// Property 'name' has no initializer and is not definitely assigned in the constructor.}classGoodGreeter{name:string;constructor(){this.name="hello";}} 注意,字段需要在构造函数自身进行初始化。TypeScript 并不会分析构造函数里你调用的方法,进而判断初始化的值,因为一个派生...
classBadGreeter{name:string;^// Property 'name' has no initializer and is not definitely assigned in the constructor.}classGoodGreeter{name:string;constructor(){this.name="hello";}} 注意,字段需要在构造器自身内部进行初始化。TypeScript 不会分析在构造器中调用的方法以检测初始化语句,因为派生类可能会...
Property 'msg' has no initializer and is not definitely assigned in the constructor. 没有修改任何文件,创建默认项目后运行报错。 Member yyx990803 commented Feb 13, 2018 无法重现,可能是你的 npm 缓存问题。看下你的 components/HelloWorld.vue 文件是否是这样的: export default class HelloWorld extends...
1. Property 'name' has no initializer and is not definitely assigned in the constructor.ts 属性"名称"没有初始化程序,并且在构造函数中未明确分配 Strict Class Initialization --strictPropertyInitialization https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-7.html#strict-class-init...
例如： class MyClass { public static string ConnectionString = GetConnectionString(); pr...
class BadGreeter { name: string; //Property 'name' has no initializer and is not definitely assigned in the constructor. } class GoodGreeter { name: string; constructor() { this.name = "hello"; } } 请注意,该字段需要在构造函数本身中进行初始化。 TypeScript 不会分析你从构造函数调用的方法...