javascript - 单击导航或指示器时，幻灯片放映速度会加快

Question

在以下代码中，当我单击导航或指示器时，幻灯片放映速度会加快。如何让控件正常工作但保持相同的时间？

当点击向左箭头时，幻灯片应该返回一张幻灯片。单击向右箭头时，幻灯片应在幻灯片上前进。单击指标 (1、2、3、4) 时，应选择该幻灯片。然后恢复当前计时。

 var slideIndex = 0;
  showSlides(slideIndex);

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

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

  function showSlides() {
      var i;
      var slides = document.getElementsByClassName("mySlides");
      var dots = document.getElementsByClassName("dot");
      for (i = 0; i < slides.length; i++) {
         slides[i].style.display = "none";  
      }
      slideIndex++;
      if (slideIndex > slides.length) {slideIndex = 1;}
      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";
      setTimeout(showSlides, 10000); // 1000 = 1 sec
  }

/* Slideshow container */
.slideshow-container {
  width: 600px;
  position: relative;
  margin: auto;
  /*top: 50px;*/
  height: 600px;
}
  
.mySlides {
  width: auto;
}
  
/* The dots/bullets/indicators */
.dot {
  height: 13px;
  width: 13px;
  margin: 0 2px;
  background-color: lightgray;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}

.active, .dot:hover {
  background-color: #717171;
}

/* Next & previous buttons */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 20px;
  width: auto;
  padding: 6px;
  color: black;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
}

/* Position the "next button" to the right */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

.prev:hover, .next:hover {
  background-color: black;
  color: white;
}

<div class="slideshow-container">
  
    <a class="prev" onclick="plusSlides(-2)">&#10094;</a>
    <div style="text-align:center; padding-top: 30px;">
      <span class="dot" onclick="currentSlide(0)"></span>
      <span class="dot" onclick="currentSlide(1)"></span>
      <span class="dot" onclick="currentSlide(2)"></span>
      <span class="dot" onclick="currentSlide(3)"></span>
    </div>
    <a class="next" onclick="plusSlides(0)">&#10095;</a>
     
  <!--Slide 1-->  
  <div class="mySlides">
    <p>Image 1</p>
    <img src="//dummyimage.com/600">
  </div>

  <!--Slide 2-->
  <div class="mySlides">
    <p>Image 2</p>
    <img src="//dummyimage.com/600">
  </div>

  <!--Slide 3-->
  <div class="mySlides">
    <p>Image 3</p>
    <img src="//dummyimage.com/600">
  </div>

  <!--Silde 4-->
  <div class="mySlides">
    <p>Image 4</p>
    <img src="//dummyimage.com/600"> 
  </div>

</div>

Answer 1

您的方法有几个错误。以下是基于 setInterval 函数的解决方案:

    var slideIndex = 1;
    var millis = 2000;
    
    nextSlide();
    var interval = setInterval(nextSlide, millis);
    
    function nextSlide() {
        showSlide();
        slideIndex++;
    }
    
    function plusSlides(n) {
        clearInterval(interval);
        slideIndex += n;
        nextSlide();
        interval = setInterval(nextSlide, millis);
    }
    
    function currentSlide(n) {
        clearInterval(interval);
        slideIndex = n + 1;
        nextSlide();
        interval = setInterval(nextSlide, millis);
    }
    
    function showSlide() {
      var i;
      var slides = document.getElementsByClassName("mySlides");
      var dots = document.getElementsByClassName("dot");
      for (i = 0; i < slides.length; i++) {
         slides[i].style.display = "none";  
      }
      if (slideIndex > slides.length) {slideIndex = 1;}
      if (slideIndex < 1) {slideIndex = slides.length;}
      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";
  }

/* Slideshow container */
.slideshow-container {
  width: 600px;
  position: relative;
  margin: auto;
  /*top: 50px;*/
  height: 600px;
}
  
.mySlides {
  width: auto;
}
  
/* The dots/bullets/indicators */
.dot {
  height: 13px;
  width: 13px;
  margin: 0 2px;
  background-color: lightgray;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}

.active, .dot:hover {
  background-color: #717171;
}

/* Next & previous buttons */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 20px;
  width: auto;
  padding: 6px;
  color: black;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
}

/* Position the "next button" to the right */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

.prev:hover, .next:hover {
  background-color: black;
  color: white;
}

<div class="slideshow-container">
  
    <a class="prev" onclick="plusSlides(-2)">&#10094;</a>
    <div style="text-align:center; padding-top: 30px;">
      <span class="dot" onclick="currentSlide(0)"></span>
      <span class="dot" onclick="currentSlide(1)"></span>
      <span class="dot" onclick="currentSlide(2)"></span>
      <span class="dot" onclick="currentSlide(3)"></span>
    </div>
    <a class="next" onclick="plusSlides(0)">&#10095;</a>
     
  <!--Slide 1-->  
  <div class="mySlides">
    <p>Image 1</p>
    <img src="//dummyimage.com/600">
  </div>

  <!--Slide 2-->
  <div class="mySlides">
    <p>Image 2</p>
    <img src="//dummyimage.com/600">
  </div>

  <!--Slide 3-->
  <div class="mySlides">
    <p>Image 3</p>
    <img src="//dummyimage.com/600">
  </div>

  <!--Silde 4-->
  <div class="mySlides">
    <p>Image 4</p>
    <img src="//dummyimage.com/600"> 
  </div>

</div>