JavaScript201708/FREE/WEEK1/Reference/2-lineChange.html at master · lixiangqi-github/JavaScript201708 · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>隔行变色-珠峰培训</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            font-size: 14px;
        }

        ul {
            list-style: none;
        }

        .cataLog {
            margin: 50px;
            width: 300px;
        }

        .cataLog li {
            line-height: 35px;
            border-bottom: 1px dashed #999;
        }

        .bg1 {
            background: lightcyan;
        }

        .bg2 {
            background: lightgoldenrodyellow;
        }

        .bg3 {
            background: lightgrey;
        }

        .bg {
            background: lightpink;
        }
    </style>
</head>
<body>
<ul class="cataLog" id="cataLog">
    <li>HTML(HTML5)</li>
    <li>CSS(CSS3)</li>
    <li>JS(JQ/ZEPTO...)</li>
    <li>移动端开发</li>
    <li>VUE</li>
    <li>REACT</li>
    <li>NODE</li>
</ul>

<script>
    var cataLog = document.getElementById('cataLog'),
            cataLogList = cataLog.getElementsByTagName('li');
    for (var i = 0, len = cataLogList.length; i < len; i++) {
        cataLogList[i].className = 'bg' + (i % 2 + 1);
    }
</script>
</body>
</html>