title: JS how to check empty String and Space
body: <p>Help me pls</p>
  
  <pre><code>if(value == ""){
  // do anything
  }
  </code></pre>
  
  <p>but I need to check space " " (2,3,... space is include) is the same way of empty String</p>
  
  <p>ps. sorry in my English</p>