w3css 在线编辑器 | w3css代码测试

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.cainiaomax.com/w3css/4/w3.css">
<style>.mySlides {display:none}
</style>
<body>

<div class="w3-container">
  <h2>幻灯片指示器</h2>
  <p>使用按钮指示幻灯片放映中有多少张幻灯片以及用户当前正在查看的幻灯片的示例。</p>
</div>

<div class="w3-content" style="max-width:800px">
  <img class="mySlides" src="img_nature_wide.jpg" style="width:100%">
  <img class="mySlides" src="img_snow_wide.jpg" style="width:100%">
  <img class="mySlides" src="img_mountains_wide.jpg" style="width:100%">
</div>

<div class="w3-center">
  <div class="w3-section">
    <button class="w3-button w3-light-grey" onclick="plusDivs(-1)">❮ Prev</button>
    <button class="w3-button w3-light-grey" onclick="plusDivs(1)">Next ❯</button>
  </div>
  <button class="w3-button demo" onclick="currentDiv(1)">1</button> 
  <button class="w3-button demo" onclick="currentDiv(2)">2</button> 
  <button class="w3-button demo" onclick="currentDiv(3)">3</button> 
</div>

<script>
var slideIndex = 1;
showDivs(slideIndex);

function plusDivs(n) {
  showDivs(slideIndex += n);
}

function currentDiv(n) {
  showDivs(slideIndex = n);
}

function showDivs(n) {
  var i;
  var x = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("demo");
  if (n > x.length) {slideIndex = 1}    
  if (n < 1) {slideIndex = x.length}
  for (i = 0; i < x.length; i++) {
    x[i].style.display = "none";  
  }
  for (i = 0; i < dots.length; i++) {
    dots[i].className = dots[i].className.replace(" w3-red", "");
  }
  x[slideIndex-1].style.display = "block";  
  dots[slideIndex-1].className += " w3-red";
}
</script>

</body>
</html>