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Set unique background color to each div in page using jQuery.

 Here I will explain hoe to set unique background-color in div using jQuery.
<html>
<head>
<title></title>
<meta charset="utf-8" />
<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<style type="text/css">
    .bg-red {
        background-color: red;
    }

    .bg-pink {
        background-color: pink;
    }

    .bg-purple {
        background-color: purple;
    }

    .bg-green {
        background-color: green;
    }

    .bg-yellow {
        background-color: yellow;
    }

    .bg-lime {
        background-color: lime;
    }

    .bg-blue {
        background-color: blue;
    }

    div.activity_type {
        width: 100px;
        height: 100px;
        float: left;
    }
</style>

<script type="text/javascript">
    $(document).ready(function () {
        var myColors = ['bg-red', 'bg-pink', 'bg-purple', 'bg-yellow', 'bg-green', 'bg-lime', 'bg-blue'];
        var i = 0;
        $('div.activity_type').length
        $('div.activity_type').each(function () {
            $(this).addClass(myColors[i]);
            i = (i + 1) % myColors.length;
        });
    });
    </script>
</head>
<body>
<div class="activity_type"></div>
<div class="activity_type"></div>
<div class="activity_type"></div>
<div class="activity_type"></div>
<div class="activity_type"></div>
<div class="activity_type"></div>
<div class="activity_type"></div>
</body>
</html>

Output:

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