How to correctly retrieve index values for events registered in batches using the for loop in javascript _ javascript tips

This article mainly introduces how javascript uses for loop batch registration events to correctly retrieve index values, and compares and analyzes the problematic code and the modified code, the methods implemented by using closures are provided for reference, if you need it, refer to the example in this article to describe how to correctly retrieve the index value for events that javascript uses for loop batch registration. Share it with you for your reference. The specific analysis is as follows:

Many may encounter a problem, that is, when the for loop is used to register event processing functions in batches, and finally the Event Processing function is used to obtain the index value of the current element, it will fail, let's take a look at a code example:

The code is as follows:

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