css 背景 平移 动画

<!DOCTYPE html>
<html lang="zh">

    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <meta http-equiv="X-UA-Compatible" content="ie=edge" />
        <title>动画</title>
        <style>
            * {
                margin: 0;
                padding: 0;
            }

            .aa {
                position: absolute;
                top: 0;
                width: 200px;
                height: 200px;
                border: 1px solid red;
                z-index: 2;
                background: transparent;
            }

            .aa:nth-child(1) {
                left: 0;
            }

            .aa:nth-child(2) {
                left: 210px;
            }

            .aa:nth-child(3) {
                left: 420px;
            }

            .aa:nth-child(4) {
                left: 630px;
            }

            .aa:nth-child(5) {
                left: 840px;
            }

            .bj {
                position: absolute;
                top: 0;
                left: 0;
                width: 200px;
                height: 200px;
                background-color: #008000;
                transition: all 1s;
            }

            .p {
                position: relative;
            }
        </style>
    </head>

    <body>
        <div class="p">
            <div class="aa">
                1
            </div>
            <div class="aa">
                2
            </div>
            <div class="aa">
                3
            </div>
            <div class="aa">
                4
            </div>
            <div class="aa">
                5
            </div>
            <div class="bj">

            </div>
        </div>
        <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
        <script type="text/javascript">
            $('.aa').click(function() {
                let index = $(this).index();
                $('.bj').css('transform', 'translateX(' + $('.aa').eq(index).css('left') + ')');
            })
        </script>
    </body>

</html>