Question

我正在学习打字稿，而且我已经编写了非常基本的代码。

class School {

    nameOfStudents: Array[string];
    noOfteachers: number

    constructor(name: Array[string], no: number) {
        this.nameOfStudents = name;
        this.noOfteachers = no;
    }

    printName():void{

        for(let i=0;i<this.nameOfStudents.length;i++){
            console.log(this.nameOfStudents[i])
        }
    }
}
let arr=["a","b","c","d","e"]
let school = new School(arr,100);

school.printName();

无论我在哪里使用过数组，我都会收到以下错误：

错误TS2314：泛型类型'Array'需要1个类型参数我在哪里做错了？

Answer 1

通用数组必须定义为：

const arr = new Array<string>()
const arr = string[]

Answer 2

建议使用T [] sythax而不是Array＆lt; T> synthax

TSlint rule＆＃34; array-type＆＃34;：[true，＆＃34; array＆＃34;]：

对于你的代码，Array [string]应该是Array＆lt;字符串＆gt;为了编译。

nameOfStudents: Array<string>;
noOfteachers: number

constructor(name: Array<string>, no: number) {
    this.nameOfStudents = name;
    this.noOfteachers = no;
}

最佳做法是这样的

class School {

    nameOfStudents: string[];
    noOfteachers: number;

    constructor(name: string[], no: number) {
        this.nameOfStudents = name;
        this.noOfteachers = no;
    }

    printName(): void {
        for (const studentName of this.nameOfStudents) {
            console.log(studentName);
    }
}

我强烈建议您为项目安装tslint，它将帮助您编写干净的Typescript代码。

打字稿：错误TS2314：泛型类型'Array <t>'需要1个类型的参数

2 个答案: