JQuery Gets the tag attribute value problem

jquery attr () cannot get property value issues
The CSS has already been set up:

Can still not get:

Guidance.

• It must be that undefined,attr is used to get or set the Tag property, not to get the CSS property. If you have a tag with an ID of nn1, you can use ww=$ ("#nn1"). CSS ("top") to get CSS properties.

• How tag properties differ from CSS properties

  Chase Answer

  <script type= "Text/javascript" >
          $ (document). Ready (function () {
              Alert ($ ("#nn1"). attr ("title"));    The title in the div tag is the tag attribute, and the ID is the tag attribute, which is the attribute that appears in the tag;
              Alert ($ ("#nn1"). CSS ("top"));    CSS properties are properties in the style sheet;
          });
      </script>
      <style type= "Text/css" >
          #nn1 {
              position:relative;
              top:30px;
          }
      </style>
      <div id= "nn1" title= "This is a div" >abc</div>

JQuery Gets the tag attribute value problem