javascript - How to add multiple classes, one with incrementing numbers, on a dynamic element? -


i've been trying create slides using swipe slider custom classes.

<!-- swiper --> <div class="swiper-container">     <div class="swiper-wrapper">         <div class="swiper-slide">slide 1</div>         <div class="swiper-slide">slide 2</div>         <div class="swiper-slide">slide 3</div>         <div class="swiper-slide">slide 4</div>         <div class="swiper-slide">slide 5</div>         <div class="swiper-slide">slide 6</div>         <div class="swiper-slide">slide 7</div>         <div class="swiper-slide">slide 8</div>         <div class="swiper-slide">slide 9</div>         <div class="swiper-slide">slide 10</div>     </div>     <!-- add pagination -->     <div class="swiper-pagination"></div> </div> <!-- swiper js --> <script src="../dist/js/swiper.min.js"></script> <!-- initialize swiper --> <script> var swiper = new swiper('.swiper-container', {     pagination: '.swiper-pagination',     paginationclickable: true,     paginationbulletrender: function (swiper, index, classname) {         return '<span class="' + classname + '">' + (index + 1) + '</span>';     } }); </script>

the swipe pagination dynamically created , generates 

<span class="swiper-pagination-bullet">1</span> <span class="swiper-pagination-bullet">2</span> <span class="swiper-pagination-bullet">3</span> <span class="swiper-pagination-bullet">4</span> <span class="swiper-pagination-bullet">5</span> <span class="swiper-pagination-bullet">6</span>

i want have div class swiper pagination 

<span class="swiper-pagination-bullet color-0">1</span> <span class="swiper-pagination-bullet color-1">2</span> <span class="swiper-pagination-bullet color-2">3</span>

how add additional custom class of color-0, color-1, color-2? thank much.

return '<span class="'+ classname +' color-'+index+'" >'+(index+1)+'</span>';

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