编程狮在线代码实例

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<!DOCTYPE html>
<html>
​
<head>
    <title>W3.CSS(w3cschool.cn)</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" charset="UTF-8">
    <link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
</head>
​
<body>
​
<h2 class="w3-center">手动幻灯片放映</h2>
​
<div class="w3-content w3-display-container">
    <img class="mySlides" src="https://atts.w3cschool.cn/img_snowtops.jpg" style="width:100%">
    <img class="mySlides" src="https://atts.w3cschool.cn/img_lights.jpg" style="width:100%">
    <img class="mySlides" src="https://atts.w3cschool.cn/img_mountains.jpg" style="width:100%">
    <img class="mySlides" src="https://atts.w3cschool.cn/img_forest.jpg" style="width:100%">
​
    <button class="w3-button w3-black w3-display-left" onclick="plusDivs(-1)">&#10094;</button>
    <button class="w3-button w3-black w3-display-right" onclick="plusDivs(1)">&#10095;</button>
</div>
​
<script>
    var slideIndex = 1;
    showDivs(slideIndex);
​
    function plusDivs(n) {
        showDivs(slideIndex += n);
    }
​
    function showDivs(n) {
        var i;
        var x = document.getElementsByClassName("mySlides");
        if (n > x.length) {slideIndex = 1}
        if (n < 1) {slideIndex = x.length}
        for (i = 0; i < x.length; i++) {
            x[i].style.display = "none";
        }
        x[slideIndex-1].style.display = "block";
    }
</script>
​
</body>
</html>
实例代码
运行结果