how to add class using attr in jquery code example
Example 1: addclass jquery
$( "p" ).addClass( "selected highlight" );
Example 2: jquery addclass
$( "p" ).addClass( "myClass yourClass" );
Example 3: javascript add class to element
var someElement= document.getElementById("myElement");
someElement.className += " newclass";//add "newclass" to element (space in front is important)