Here is jsFiddle.

HTML

<h3 class="profileRightAboutMeText">Heya,this is all the text.</h3>     
<textarea class="profileRightAboutMeTextarea"></textarea>

JQUERY

$(document).on('click','h6.editMyProfileSection',function() {
  var originalText = $('h3.profileRightAboutMeText').text();

  $('h3.profileRightAboutMeText').fadeOut('fast',function() {
    $('textarea.profileRightAboutMeTextarea').text(originalText).fadeIn('fast');
  });
  alert(originalText);
});

警报和< textarea>显示文字双重如下：

Heya,这是所有的文字.Heya,这是所有的文字.