Question

我的HTML代码与我在stackoverflow上发现的许多代码不同，我认为使用他们的答案并不适用于我。

我有一个左右按钮的旋转木马，允许用户转到上一张和下一张图片。然而，在平均时间里，我希望我的旋转木马每3秒从右侧滑动自动过渡（因此图像2将从右侧滑入以替换图像1）。我已尝试在我的JS文件中执行此操作，但它确实每3秒转换一次（没有滑动部分），当您单击按钮时它会以某种方式加速轮播（当我添加时，后退按钮似乎也不起作用自动过渡，即使没有它，它工作得很好）。

我的HTML代码：

<body>
  <div class="slideshow-container">

  <div class="mySlides">
    <div class="numbertext">1 / 5</div>
    <img src="https://static.pexels.com/photos/236047/pexels-photo-236047.jpeg" style="width:100%">
    <div class="carousel-caption">
      <h3>Caption 1</h3>
      <p>Caption 1 text</p>
    </div>
  </div>

  <div class="mySlides">
    <div class="numbertext">2 / 5</div>
    <img src="https://www.nature.org/cs/groups/webcontent/@web/documents/media/2016-photocontest-yosemite-w-1.jpg" style="width:100%">
    <div class="carousel-caption">
      <h3>Caption 2</h3>
      <p>Caption 2 text</p>
    </div>
  </div>

  <div class="mySlides">
    <div class="numbertext">3 / 5</div>
    <img src="https://static.pexels.com/photos/33109/fall-autumn-red-season.jpg" style="width:100%">
    <div class="carousel-caption">
      <h3>Caption 2</h3>
      <p>Caption 2 text</p>
    </div>
  </div>
  ...
  <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
  <a class="next" onclick="plusSlides(1)">&#10095;</a>

  </div>
  <br>

  <div style="text-align:center">
    <span class="dot" onclick="currentSlide(1)"></span>
    <span class="dot" onclick="currentSlide(2)"></span>
    <span class="dot" onclick="currentSlide(3)"></span>
    <!-- <span class="dot" onclick="currentSlide(4)"></span>
    <span class="dot" onclick="currentSlide(5)"></span> -->
  </div>
</body>
<script type="text/javascript" src="interactions.js"> </script>
<script src="js/bootstrap.js"></script>

我的JS代码：

var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
  showSlides(slideIndex += n);
}

function currentSlide(n) {
  showSlides(slideIndex = n);
}

function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("dot");
  if (n > slides.length) {slideIndex = 1}
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
      slides[i].style.display = "none";
  }
  for (i = 0; i < dots.length; i++) {
      dots[i].className = dots[i].className.replace(" active", "");
  }
  slides[slideIndex-1].style.display = "block";
  dots[slideIndex-1].className += " active";
}

更新

我已经更新了我的JS以包含这个变量，但是当它在showSlides函数中时它不起作用，但是当它在外面并在全局环境中设置时它可以工作。

var timer = setInterval( function(){ plusSlides(1); }, 3000 );

我需要添加哪些功能才能使此自动转换工作并使其从右向左滑动？或者我只是编辑我现有的一个功能？

谢谢！

Answer 1

设置间隔并将其分配给变量...

var timer = setInterval( function(){ plusSlides(1); }, 3000 );

在您的代码中，请务必清除间隔并重置它...

function showSlides(n) {
  clearInterval( timer );
  ...
  timer = setInterval( function(){ plusSlides(1); }, 3000 );
}

<强>更新

我再试一次，但这次使用超时。当showSlides（）函数执行时，它会清除计时器，然后在定义的时间后再次触发整个过程。

＆＃13;

var slideIndex = 1;
showSlides(slideIndex);

var timer;

function plusSlides(n) {
  showSlides(slideIndex += n);
}

function currentSlide(n) {
  showSlides(slideIndex = n);
}

function showSlides(n) {
  if (timer) {
    clearTimeout(timer);
  }
  var i;
  var slides = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("dot");
  if (n > slides.length) {slideIndex = 1}
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
      slides[i].style.display = "none";
  }
  for (i = 0; i < dots.length; i++) {
      dots[i].className = dots[i].className.replace(" active", "");
  }
  slides[slideIndex-1].style.display = "block";
  dots[slideIndex-1].className += " active";
  timer = setTimeout( function(){ plusSlides(1); }, 5000 );
}

＆＃13;

.dot, .slideNav a{
  height: 10px;
  width: 10px;
  float: left;
  display: block;
  margin: 0 10px;
  cursor: pointer;
}

.slideNav{
  width: 200px;
  margin: auto;
}

.dot{
  background-color: white;
  border: solid 3px black;
  border-radius: 10px;
}

.dot.active{ background-color: black; }

.carousel-caption{ 
  margin-top: -100px;
  padding: 5px 5%;
  background-color: rgba( 255, 255, 255, 0.5);
  width: 90%;
  height: 100px;
  position: absolute;
}

＆＃13;

<div class="slideshow-container">

  <div class="mySlides">
    <div class="numbertext">1 / 3</div>
    <img src="https://static.pexels.com/photos/236047/pexels-photo-236047.jpeg" style="width:100%">
    <div class="carousel-caption">
      <h3>Caption 1</h3>
      <p>Caption 1 text</p>
    </div>
  </div>

  <div class="mySlides">
    <div class="numbertext">2 / 3</div>
    <img src="https://www.nature.org/cs/groups/webcontent/@web/documents/media/2016-photocontest-yosemite-w-1.jpg" style="width:100%">
    <div class="carousel-caption">
      <h3>Caption 2</h3>
      <p>Caption 2 text</p>
    </div>
  </div>

  <div class="mySlides">
    <div class="numbertext">3 / 3</div>
    <img src="https://static.pexels.com/photos/33109/fall-autumn-red-season.jpg" style="width:100%">
    <div class="carousel-caption">
      <h3>Caption 3</h3>
      <p>Caption 3 text</p>
    </div>
  </div>
  </div>
  <br>

  <div class="slideNav" style="text-align:center">
    <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
    <span class="dot" onclick="currentSlide(1)"></span>
    <span class="dot" onclick="currentSlide(2)"></span>
    <span class="dot" onclick="currentSlide(3)"></span>
    <a class="next" onclick="plusSlides(1)">&#10095;</a>
  </div>

＆＃13;

从右侧滑动的旋转木马自动过渡

1 个答案: