如何自动播放w3school javascript报价幻灯片？

Question

我正在尝试自动播放此javascript滑块，但无法执行此操作。如何自动播放w3school javascript报价幻灯片？

<script>
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_nws");
  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";
}
</script>

Answer 1

使用setInterval函数进行自动滑动，在javascript中使用以下代码

class InputDialog(QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.first = QLineEdit(self)
        self.second = QLineEdit(self)
        buttonBox = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Cancel, self);

        layout = QFormLayout(self)
        layout.addRow("First text", self.first)
        layout.addRow("Second text", self.second)
        layout.addWidget(buttonBox)

        buttonBox.accepted.connect(self.accept)
        buttonBox.rejected.connect(self.reject)

    def getInputs(self):
        return (self.first.text(), self.second.text())

if __name__ == '__main__':

    import sys
    app = QApplication(sys.argv)
    dialog = InputDialog()
    if dialog.exec():
        print(dialog.getInputs())
    exit(0)

window.onload= function () {
 setInterval(function(){ 
     plusSlides(1);
 }, 3000);
 }

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";
}
window.onload= function () {
 setInterval(function(){ 
     plusSlides(1);
 }, 3000);
 }

* {box-sizing: border-box}
body {font-family: Verdana, sans-serif; margin:0}

/* Slideshow container */
.slideshow-container {
  position: relative;
  background: #f1f1f1f1;
}

/* Slides */
.mySlides {
  display: none;
  padding: 80px;
  text-align: center;
}

/* Next & previous buttons */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  margin-top: -30px;
  padding: 16px;
  color: #888;
  font-weight: bold;
  font-size: 20px;
  border-radius: 0 3px 3px 0;
  user-select: none;
}

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

/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
  background-color: rgba(0,0,0,0.8);
  color: white;
}

/* The dot/bullet/indicator container */
.dot-container {
    text-align: center;
    padding: 20px;
    background: #ddd;
}

/* The dots/bullets/indicators */
.dot {
  cursor: pointer;
  height: 15px;
  width: 15px;
  margin: 0 2px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}

/* Add a background color to the active dot/circle */
.active, .dot:hover {
  background-color: #717171;
}

/* Add an italic font style to all quotes */
q {font-style: italic;}

/* Add a blue color to the author */
.author {color: cornflowerblue;}