Question

我有一个用JavaScript制作幻灯片的功能。在尝试添加功能时，在点击时更改幻灯片，我的功能停止工作，它有什么问题？完整代码on Khan Academy

var slideShow = function(container, time, effect) {
  container = document.querySelector(container);
  this.images = [];
  this.curImage = 0;

  if (effect === "click_fade") {
    for (i = 0; i < container.childElementCount; i++) {
      this.images.push(container.children[i]);
      this.images[i].style.opacity = 0;
    }

    // Handle going to to the next slide
    var nextSlideClick = function() {
      for (var i = 0; i < this.images.length; i++) {
        if (i != this.curImage) this.images[i].style.opacity = 0;
      }
      this.images[this.curImage].style.opacity = 1;
      this.curImage++;
      if (this.curImage >= this.images.length) this.curImage = 0;
      window.setTimeout(nextSlide.bind(document.getElementById(this)), time);
    };
    container.addEventListener("click", nextSlideClick)

  }

  nextSlide.call(this);

};
slideShow("#slideshow", 2000, "click_fade");

.slide {
  transition: opacity 0.5s;
  position: absolute;
  top: 0;
}

<div id="slideshow">
  <img class="slide" src="https://www.kasandbox.org/programming-images/animals/birds_rainbow-lorakeets.png" alt="Rainbow lorakeets" />
  <img class="slide" src="https://www.kasandbox.org/programming-images/animals/butterfly.png" alt="Butterfly" />
  <img class="slide" src="https://www.kasandbox.org/programming-images/animals/cat.png" alt="Cat" />
  <img class="slide" src="https://www.kasandbox.org/programming-images/animals/crocodiles.png" alt="Crocodiles" />
  <img class="slide" src="https://www.kasandbox.org/programming-images/animals/fox.png" alt="Fox" />

</div>

没有结果，出了什么问题？谢谢！

Answer 1

您可以尝试以下操作：

<style>
   .slide {
  transition: opacity 0.5s;
  position: absolute;
  top: 0;
}
</style>

<div id="slideshow">
     <img class="slide" src="https://www.kasandbox.org/programming-images/animals/birds_rainbow-lorakeets.png" alt="Rainbow lorakeets" />
    <img class="slide" src="https://www.kasandbox.org/programming-images/animals/butterfly.png" alt="Butterfly" />
   <img class="slide" src="https://www.kasandbox.org/programming-images/animals/cat.png" alt="Cat" />
   <img class="slide" src="https://www.kasandbox.org/programming-images/animals/crocodiles.png" alt="Crocodiles" />
   <img class="slide" src="https://www.kasandbox.org/programming-images/animals/fox.png" alt="Fox" />
</div>

<script>
    var slideShow = function(container, time, effect) {
    container = document.querySelector(container);
    this.images = [];
    this.curImage = 0;

  if (effect === "click_fade") {
  for (i = 0; i < container.childElementCount; i++) {
        this.images.push(container.children[i]);
        this.images[i].style.opacity = 0;
    }

    // Handle going to to the next slide
    var nextSlideClick = function() {
    for (var i = 0; i < this.images.length; i++) {
            if (i != this.curImage) this.images[i].style.opacity = 0;
      }
        this.images[this.curImage].style.opacity = 1;
        this.curImage++;
        if (this.curImage >= this.images.length) this.curImage = 0;
    window.setTimeout(nextSlideClick.bind(document.getElementById(this)), time);
        };
        container.addEventListener("click", nextSlideClick)

  nextSlideClick.call(this);
}
};
slideShow("#slideshow", 2000, "click_fade");
</script>

在这个jsfiddle中做了一些小改动：Here

为什么我的事件监听器不在函数内部工作？

1 个答案: