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Editor to share with you how to use indexof in vue, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

In vue, indexof () can be used to return the position where a specified string value first appears in the string, or to use the return value to determine whether the specified string exists or not, the syntax "stringObject.indexOf (searchvalue,fromindex)".

The operating environment of this tutorial: windows7 system, vue2.9.6 version, DELL G3 computer.

Indexof in vue

The indexOf () method returns the position where a specified string value first appears in the string.

Grammar

StringObject.indexOf (searchvalue,fromindex)

Parameter description

Searchvalue: required. Specifies the string value to retrieve.

Fromindex: optional integer parameter. Specifies where to start the retrieval in the string. Its legal value is 0 to stringObject.length-1. If this parameter is omitted, it will be retrieved from the first character of the string.

Description

This method retrieves the string stringObject from beginning to end to see if it contains the substring searchvalue. The retrieval starts at the fromindex of the string or at the beginning of the string (when no fromindex is specified). If a searchvalue is found, the location where the searchvalue first appeared is returned. The character position in stringObject starts at 0.

Tips and comments

Note: the indexOf () method is case sensitive!

Note: if the string value to be retrieved does not appear, the method returns-1.

Example

How to use indexOf () to retrieve within a string.

If (whiteList.indexOf (to.path)! =-1) {undefined// is in the login-free whitelist, go directly to next ()} else {undefinednext (`/ login?redirect=$ {undefinedto.path}`) / / otherwise redirect to the login page NProgress.done ()}} above is all the content of this article "how to use indexof in vue". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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