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Cannot get the index of keyup, always get the index corresponding to the last class
is written backwards, it should be $(this).index($(".select2-input"))
$(this).index($(".select2-input"))
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
is written backwards, it should be
$(this).index($(".select2-input"))