js 淡入淡出的tab选项卡

代码如下

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<style>
    body {font-family: "Lato", sans-serif;}

    /* Style the tab */
    div.tab {
        overflow: hidden;
        border: 1px solid #ccc;
        background-color: #f1f1f1;
    }

    /* Style the buttons inside the tab */
    div.tab button {
        background-color: inherit;
        float: left;
        border: none;
        outline: none;
        cursor: pointer;
        padding: 14px 16px;
        transition: 0.3s;
        font-size: 17px;
    }

    /* Change background color of buttons on hover */
    div.tab button:hover {
        background-color: #ddd;
    }

    /* Create an active/current tablink class */
    div.tab button.active {
        background-color: #ccc;
    }

    /* Style the tab content */
    /*.tabcontent {*/
        /*display: none;*/
        /*padding: 6px 12px;*/
        /*border: 1px solid #ccc;*/
        /*border-top: none;*/
    /*}*/

    /* Style the tab content */
    .tabcontent {
        display: none;
        padding: 6px 12px;
        -webkit-animation: fadeEffect 1s;
        animation: fadeEffect 1s;
    }

    /* Fade in tabs */
    @-webkit-keyframes fadeEffect {
        from {opacity: 0;}
        to {opacity: 1;}
    }

    @keyframes fadeEffect {
        from {opacity: 0;}
        to {opacity: 1;}
    }
</style>
<body>
<p>点击各个选项卡查看内容:</p>

<div class="tab">
    <button id="defaultOpen" class="tablinks" onclick="openCity(event, 'London')">London</button>
    <button class="tablinks" onclick="openCity(event, 'Paris')">Paris</button>
    <button class="tablinks" onclick="openCity(event, 'Tokyo')">Tokyo</button>
</div>

<div id="London" class="tabcontent">
    <h3>London</h3>
    <p>London is the capital city of England.</p>
</div>

<div id="Paris" class="tabcontent">
    <h3>Paris</h3>
    <p>Paris is the capital of France.</p>
</div>

<div id="Tokyo" class="tabcontent">
    <h3>Tokyo</h3>
    <p>Tokyo is the capital of Japan.</p>
</div>
</body>
</html>
<script>
    function openCity(evt, cityName) {
        var i, tabcontent, tablinks;

        //所有tab-content移除block效果，tab-links先移除active。
        tabcontent = document.getElementsByClassName("tabcontent");
        for (i = 0; i < tabcontent.length; i++) {
            tabcontent[i].style.display = "none";
        }
        tablinks = document.getElementsByClassName("tablinks");
        for (i = 0; i < tablinks.length; i++) {
            tablinks[i].className = tablinks[i].className.replace(" active", "");
        }

        //根据字符串把对应的tab-content和tab-links加上效果。
        document.getElementById(cityName).style.display = "block";
        evt.currentTarget.className += " active";

//        tabcontent[i].style.display = "none";
    }

    // 触发 id="defaultOpen" click 事件,默认让第I一个tabcontent显示。
    document.getElementById("defaultOpen").click();
    
//    var tabcontent = document.getElementsByClassName("tabcontent");
//    tabcontent[0].style.display = "block";
//
//    var tablinks = document.getElementsByClassName("tablinks");
//    tablinks[0].className += " active";
</script>

二.淡入弹出效果

如果要淡入弹出的动画效果。则把上面的tabcontent样式加上animation属性。并加上动画的效果fadeEffect定义。

/* Style the tab content */
.tabcontent {
    display: none;
    padding: 6px 12px;
    -webkit-animation: fadeEffect 1s;
    animation: fadeEffect 1s;
}

/* Fade in tabs */
@-webkit-keyframes fadeEffect {
    from {opacity: 0;}
    to {opacity: 1;}
}

@keyframes fadeEffect {
    from {opacity: 0;}
    to {opacity: 1;}
}

js 淡入淡出的tab选项卡

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