JavaScript 中如何检查字符串是否包含子字符串? [英] How to check whether a string contains a substring in JavaScript?

问题描述

通常我希望有一个 String.contains() 方法，但似乎没有.

Usually I would expect a String.contains() method, but there doesn't seem to be one.

什么是合理的检查方法?

What is a reasonable way to check for this?

推荐答案

ECMAScript 6 引入 String.prototype.includes:

ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring)); // true

includes 没有 Internet Explorer 支持， 尽管.在 ECMAScript 5 或更早的环境中，使用 String.prototype.indexOf，当找不到子串时返回-1:

includes doesn’t have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:

var string = "foo";
var substring = "oo";

console.log(string.indexOf(substring) !== -1); // true

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