javascript - JQuery event dosen't work after .addClass -


why div#1 dosen't change text. i'm doing wrong?

<div id="1" class="a" style="width: 300px;height: 300px; background-color: #003366"></div> <div id="2" class="b" style="width: 300px;height: 300px; background-color: #003366"></div>  <script> $(document).ready(function(){     $(".b").click(function(){        $(this).text("hello");     });      $(".a").mouseover(function(){       $(this).addclass("b");     }); }); </script>

try 

$("body") .on('click', '.a', function (){    $(this).addclass("b"); }) .on('click', '.b', function (){     $(this).text("hello"); })

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