zepto - toggleClass

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>zepto</title>
    <style>
        .main {
            font-size: 120%;
            color: red;
        }
    </style>
</head>
<body>
<h1 id="h1">This is a heading</h1>

<p>This is a paragraph.</p>

<p>This is another paragraph.</p>
<button class="btn1">切换段落的 "main" 类</button>
<script src="zepto.min.js"></script>
<script>
    $("button").click(function () {
        $("p").toggleClass("main");
    });
</script>
</body>
</html>

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>zepto</title>
    <style>
        .listitem_1, .listitem_3 {
            color: red;
        }

        .listitem_0, .listitem_2 {
            color: blue;
        }
    </style>
</head>
<body>
<h1 id="h1">This is a heading</h1>
<ul>
    <li>Apple</li>
    <li>IBM</li>
    <li>Microsoft</li>
    <li>Google</li>
</ul>
<button class="btn1">添加或移除列表项的类</button>
<script src="zepto.min.js"></script>
<script>
    $("button").click(function () {
        $('ul li').toggleClass(function () {
            return 'listitem_' + $(this).index();
        });
    });
</script>
</body>
</html>