javascript - jquery.data API and event binding[Unable to understand] -


please explain following snippet [read on internet , couldn't understand]:

var $this = $(this); $this.data('key', $this);  $this.on('click.key', function(e) {     // });

i know jquery.data dumps in jquery cache can accessed via $.cache how can use key css selector when binding event.

edit

found out answer question. doesn't have data api, rather, more related event namespacing.

jquery api reference here


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