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In this article Xiaobian for you to introduce in detail "how to use indexOf () method to judge a string contains a character in js", the content is detailed, the steps are clear, and the details are handled properly. I hope that this article "how to use the indexOf () method to determine that a string contains a character in js" can help you solve your doubts.

1. IndexOf () method

Returns the index number in a string where you want to search for the first occurrence of the string value

If the string value to be retrieved does not appear, the method returns-1.

2. Use grammar

StrObj.indexOf (subString [, startIndex])

3. Parameters

StrObj (required): String object or text.

SubString (required): the substring to find in the String object.

StarIndex (optional): this integer value indicates the index to start the lookup within the String object. If omitted, look at the beginning of the string.

4. Use the indexOf () method to judge that a string contains a character

The let str= "abc" console.log (str.indexOf ("b")! =-1) / / true//indexOf () method returns the position where a specified string value first appears in the string. If the string value to be retrieved does not exist, return-1. This is the end of the article "how to use the indexOf () method in js to determine that a string contains a character." If you want to master the knowledge of this article, you still need to practice and use it. If you want to know more about the articles, you are welcome to follow the industry information channel.

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