Aggiungere tasto pause/play a slideshow javascript

[cosina]

Aggiungere tasto pause/play a slideshow javascript

Buonasera a tutti, avrei bisogno di aiuto per aggiungere un pulsante ad un semplice slideshow con autoplay per poterlo fermarlo e riavviare manualmente. Grazie mille per l'aiuto.
Il codice è questo:

CSS:

*, *:before, *:after {
  -webkit-box-sizing: border-box;
  -o-box-sizing: border-box;
  box-sizing: border-box;
}

img {
  max-width: 100%;
}
/* Slideshow container */
.slideshow-container {
  max-width: 800px;
  position: relative;
  margin: 40px auto;
  width: 100%;
  overflow: hidden;
}

.slideshow-nav {
  text-align: center;
  width: 100%;
  position: absolute;
  bottom: 2%;
}

.mySlides {
  width: auto;
}
  
/* The dots/bullets/indicators */
.dot {
  height: 13px;
  width: 13px;
  margin: 0 2px;
  background-color: #f9f6f6;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}

.active, .dot:hover {
  background-color: #ff0000;
}

/* Next & previous buttons */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  padding: 6px;
  color: #fff;
  color: rgba(255, 255, 255, 0.5);
  font-weight: bold;
  font-size: 3.0rem;
  border-radius: 0 3px 3px 0;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
  -webkit-transition: 0.6s ease-out;
  -moz-transition: 0.6s ease-out;
  -o-transition: 0.6s ease-out;
  transition: 0.6s ease-out;
}

/* 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;
  cursor: pointer;
}

.fadeIn {
  -webkit-animation-name: fadeIn;
  animation-name: fadeIn;
  -webkit-animation-duration: 1s;
  animation-duration: 1s;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
}

@-webkit-keyframes fadeIn {
  0% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}

@keyframes fadeIn {
  0% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}

HTML:
[HTML]
<!-- start slider -->
<div class="slideshow-container">
<!--Slide 1-->
<div class="mySlides fadeIn">
<img src="01.jpg">
</div>
<!--Slide 2-->
<div class="mySlides fadeIn">
<img src="02.jpg">
</div>
<!--Slide 3-->
<div class="mySlides fadeIn">
<img src="03.jpg">
</div>
<!--Silde 4-->
<div class="mySlides fadeIn">
<img src="04.jpg">
</div>
<a class="prev" onclick="plusSlides(-2);">❮</a>
<a class="next" onclick="plusSlides(0)">❯</a>
<div class="slideshow-nav">
<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>
</div>
[/HTML]

JAVASCRIPT:

var slideIndex = 1;
  var millis = 5000;
  var interval;
  var timeout;

  startSlides();
  function startSlides(){
    pauseSlides();
    nextSlide();
    interval = setInterval(nextSlide, millis);
  }
  function resumeSlides() {
    nextSlide();
  }
  function pauseSlides() {
    clearInterval(interval);
  }
  function nextSlide() {
    showSlide();
    slideIndex++;
  }
  function plusSlides(n) {
    clearInterval(interval);
    clearTimeout(timeout);
    slideIndex += n;
    nextSlide();
    timeout = setTimeout(startSlides, millis * 2)
  }
  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*.style.display = "none";
    }
    if (slideIndex > slides.length) {
      slideIndex = 1;
    }
    if (slideIndex < 1) {
      slideIndex = slides.length;
    }
    for (i = 0; i < dots.length; i++) {
      dots*.className = dots*.className.replace(" active", "");
    }
    slides[slideIndex - 1].style.display = "block";
    dots[slideIndex - 1].className += " active";
  }

[flaviors200]

Ciao,

aggiungi questo codice nell'HTML, dovrebbe andare

[HTML]
<input type="button" value="Pause" onclick="javascript:if ('Play' === this.value) {this.value = 'Pause'; startSlides();} else {this.value = 'Play'; pauseSlides();}">
[/HTML]

[cosina]

Grazie mille flaviors, dovrebbe funzionare, ci lavoro..