TypeScript转换数组 [英] TypeScript casting arrays

问题描述

我试图为希望使用数组作为输入参数的库使用包装器。

I'm trying to use a wrapper for a library that wants an Array as an input parameter.

我尝试转换数组，但出现错误：无法将'any []'转换为'Array'

I tried casting the Array, but I get an error: Cannot convert 'any[]' to 'Array'

有没有办法做到这一点？

Is there a way to make this work?

var rows = new Array(10);
var rows2 = <Array>rows; //<--- Cannot convert 'any[]' to 'Array'

推荐答案

TypeScript中有4种可能的数组转换方法：

There are 4 possible conversion methods in TypeScript for arrays:

let x = []; //any[]

let y1 = x as number[];
let z1 = x as Array<number>;
let y2 = <number[]>x;
let z2 = <Array<number>>x;

as 运算符主要用于 *。tsx 文件以避免语法歧义。

The as operator's mostly designed for *.tsx files to avoid the syntax ambiguity.

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