<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>

    <body>
        <script type="text/javascript">
            window.onload = function() {
                new Camel('border-bottom-color');
            }

            function Camel(str) {
                this.result = '';
                this.arr = str.split('-');
                this.result += this.arr[0].toString();
                for(var i = 1; i < this.arr.length; i++) {
                    var str1 = this.arr[i].toString();
                    var str2 = str1.charAt(0).toUpperCase();
                    var str3 = str2 + str1.slice(1);
                    this.result += str3;
                }
                console.log(this.result);
            }
        </script>
    </body>

</html>