This post is about how to effectively use the String.prototype.substring() method in JavaScript. We go through a few examples to understand how it works, play around to observe a few patterns and ...

When you want to extract only a part of a string, you use the "substring() method" in JavaScript. In this article, I will explain the basic usage of substring(), as well as its behavior when arguments ...

The basic function common to both methods is that they extract a string within a specified range and return it as a new string. It is common to specify two indices as arguments: the "start position" ...

原创 最新推荐文章于 2026-05-02 07:21:11 发布 · 3.8k 阅读 本文介绍JavaScript中使用substring、indexOf及lastIndexOf方法截取和查找字符串的方法。通过实例演示如何高效地从复杂字符串中提取所需部分。

1. substring ()到底在做什么：先理解它的设计逻辑 substring () 是JavaScript中String对象的一个原生方法，用来从字符串中提取一段连续字符，返回一个新的字符串，而不修改原字符串。乍一听很简单，但它真正有意思的地方在于参数规则和边界行为。