[jQuery] each function(for 대신 $(대상이 되는 selector).each)

* do something for every element returned from selector

$(document).ready(function(){
    $('#items').on("click", function(){
        $('.progress-bar').each(function() {

            var randomPct = Math.round(Math.random() * 100);

            $(this).attr("aria-valuenow", randomPct);
            $(this).css("width", randomPct = "%");
            $(this).text(randomPct);
        })
    })
})

 

출처 : https://www.youtube.com/watch?v=EwJjQe0TtPM