如何在 TypeScript 中将字符串转换为数字? [英] How to convert a string to number in TypeScript?

问题描述

给定一个数字的字符串表示，如何在 TypeScript 中将其转换为 number 类型?

var numberString: string = "1234";var numberValue: number =/* 我应该如何处理 `numberString`?*/;

解决方案

表格取自 这个答案

Given a string representation of a number, how can I convert it to number type in TypeScript?

var numberString: string = "1234";
var numberValue: number = /* what should I do with `numberString`? */;

解决方案

Exactly like in JavaScript, you can use the parseInt or parseFloat functions, or simply use the unary + operator:

var x = "32";
var y: number = +x;

All of the mentioned techniques will have correct typing and will correctly parse simple decimal integer strings like "123", but will behave differently for various other, possibly expected, cases (like "123.45") and corner cases (like null).

Table taken from this answer

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