javascript - 如何在JavaScript中检查字符串是否包含子字符串？(How to check whether a string contains a substring in JavaScript?)

Question

(This post is a Community Wiki) .

((这篇文章是社区维基)

。) Edit existing answers to improve this post.

(编辑现有答案以改善此职位。)

It is not currently accepting new answers.

(它当前不接受新的答案。)

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

(通常我希望使用String.contains()方法，但是似乎没有。)

What is a reasonable way to check for this?

(有什么合理的方法来检查？)

  ask by community wiki translate from so

Answer 1

ECMAScript 6 introduced String.prototype.includes :

(ECMAScript 6引入了String.prototype.includes ：)

 var string = "foo", substring = "oo"; console.log(string.includes(substring)); 

includes doesn't have Internet Explorer support , though.

(includes 不支持Internet Explorer 。)

In ECMAScript 5 or older environments, use String.prototype.indexOf , which returns -1 when a substring cannot be found:

(在ECMAScript 5或更旧的环境中，使用String.prototype.indexOf ，如果找不到子字符串，则返回-1：)

 var string = "foo", substring = "oo"; console.log(string.indexOf(substring) !== -1);