Question

我刚刚使用TypeScript下载了Ionic 2示例项目，并希望创建以下类：

export class Accomodation {
     private longitude:number;
     private latitude:number;
     private name:string;


    constructor(public long, public lat, public name) {
        this.longitude = long;
        this. latitude = lat;
        this.name = name;
    }


    get longitude():number {
        return this.longitude;
    }

    set longitude(value:number) {
        this.longitude = value;
    }

    get latitude():number {
        return this.latitude;
    }

    set latitude(value:number) {
        this.latitude = value;
    }

    get name():string {
        return this.name;
    }

    set name(value:string) {
        this.name = value;
    }
}

我这样使用它：

    import  {Injectable} from 'angular2/core';
import {Accomodation} from "../model/Accomodation";



@Injectable()
export class LocationService{
     static getLocations(){
        var location1 = new Accomodation(10, 10, "A beautiful place");
        var location2 = new Accomodation(20, 20, "A wonderful place");

        var allLocations = [location1, location2];

        return Promise.resolve(allLocations);
    }
}

然而，我遇到了错误：

****/Accomodation.ts
Error:(6, 14) TS2300: Duplicate identifier 'longitude'.
Error:(7, 14) TS2300: Duplicate identifier 'latitude'.
Error:(8, 14) TS2300: Duplicate identifier 'name'.
Error:(11, 49) TS2300: Duplicate identifier 'name'.
Error:(18, 9) TS2300: Duplicate identifier 'longitude'.
Error:(22, 9) TS2300: Duplicate identifier 'longitude'.
Error:(26, 9) TS2300: Duplicate identifier 'latitude'.
Error:(30, 9) TS2300: Duplicate identifier 'latitude'.
Error:(34, 9) TS2300: Duplicate identifier 'name'.
Error:(38, 9) TS2300: Duplicate identifier 'name'.

我不知道发生了什么事。谷歌搜索没有帮助任何想法我能做什么？

Answer 1

声明像constructor(public long, public lat, public name)这样的构造函数，就是这样的语法糖：

public longitude:number;
public latitude:number;
public name:string;

constructor(longitude, latitude, name) {
    this.longitude = longitude;
    this.latitude = latitude;
    this.name = name;
}

但是你已经声明了这些属性（作为私有），因此Typescript编译器会为每个属性看到两个不同的声明。

您可以执行以下操作之一：

private longitude:number;
private latitude:number;
private name:string;

constructor(long, lat, name) {
    this.longitude = long;
    this.latitude = lat;
    this.name = name;
}

或（未先声明任何内容）

constructor(private longitude:number, private latitude:number, private name:string) {}

此外，您的getter / setter与私有属性具有相同的名称可能是一个问题。通常的做法是使用_前缀命名私有属性。

离子2 - 重复标识符

1 个答案: