javascript - Why does badge count go from 1 to 12? -


when receiving message in chat program, count should increment 1. jumps 1 12. why that?

$("#btn").click(function(){    var count = number($('.badge').text());    $('.badge').text(count + 1);  });
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-kj3o2dktikvyik3uenzmm7kckrr/re9/qpg6aazgjwfdmvna/gpgff93hxpg5kkn" crossorigin="anonymous"></script>  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js" integrity="sha384-b/u6ypibehpof/4+1nzfpr53nxss+glckfwbdfntxtclqqenisfwazpkamnfnmj4" crossorigin="anonymous"></script>  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0abixch4zdo7tp9hkz4tshbi047nrkglo3sejag45jxxngifyzk4si90rdiqnm1" crossorigin="anonymous"></script>  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <span class="badge">0</span>    <button id="btn"></button>

i able reproduce problem putting two elements class badge in same page. causes $('.badge').text() return 11, incremented 12 stored in each badge. if intended have 1 badge, rid of other one. or perhaps meant give them each different names?

otherwise, increment each badge separately:

$(".badge").each(function(idx){     var count = number($(this).text());     $(this).text(count + 1); });

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