title: How to find element's id equal var value?
body: <p>How to find element's id equal variable value?<br>
  $('.el'[id="var"]) not work..</p>
  
  <pre><code>$('.a').hover(function(){
      var current_id = $(this).attr('id'); // console.log(current_id);
      $('.b[id="current_id"]').css({'font-size':'22px'}); // not work
      // console.log($('.b')); get[&lt;div class="b" id="0"&gt;0&lt;/div&gt; , &lt;div class="b" id="1"&gt;1&lt;/div&gt; , &lt;div class="b" id="2"&gt;2&lt;/div&gt;]
  }, function(){
  
  });
  </code></pre>
  
  <p>html</p>
  
  <pre><code>&lt;div class="a" id="0"&gt;0&lt;/div&gt;
  
  &lt;div class="b" id="0"&gt;0&lt;/div&gt;
  &lt;div class="b" id="1"&gt;1&lt;/div&gt;
  &lt;div class="b" id="2"&gt;2&lt;/div&gt;
  ...
  </code></pre>