1.     <style>
  2.         .s1{color: rebeccapurple;font-size: 25px;}
  3.         .s2{color: red;}
  4.         .s3{color: blue;}
  5.         .s4{color:yellow;}
  6.         
  7.     </style>
  8.     <div id="div">
  9.         <span>1</span>
  10.         <span>2</span>
  11.         <span>1</span>
  12.         <span>3</span>
  13.         <span>1</span>
  14.     </div>
  15.     <script>
  16.         var div=document.getElementById('div');
  17.         var child=div.children;
  18.         var ar=[];
  19.         for(i=0;i<child.length;i++){
  20.             var n=child[i].innerHTML;
  21.             ar.push(n);
  22.         }
  24.         for(i=0;i<ar.length;i++){
  25.             child[i].className='s'+ar[i];
  26.         }
  27.     </script>

 

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