javascript - 向我的图像 slider 添加过渡效果

Question

我正在使用图像 slider ，我正在尝试从零开始做一个，这样我就可以在这个过程中学习。我能做的很简单，我想添加一个过渡效果，比如淡出，或类似的东西。如果有人知道如何将它添加到我的代码中，那将对我有很大帮助。这是我到目前为止所做的:

var currentIndex = 0,
  items = $('.container div'),
  itemAmt = items.length;

function cycleItems() {
  var item = $('.container div').eq(currentIndex);
  items.hide();
  item.css('display','inline-block');
}

var autoSlide = setInterval(function() {
  currentIndex += 1;
  if (currentIndex > itemAmt - 1) {
    currentIndex = 0;
  }
  cycleItems();
}, 3000);

$('.next').click(function() {
  clearInterval(autoSlide);
  currentIndex += 1;
  if (currentIndex > itemAmt - 1) {
    currentIndex = 0;
  }
  cycleItems();
});

$('.prev').click(function() {
  clearInterval(autoSlide);
  currentIndex -= 1;
  if (currentIndex < 0) {
    currentIndex = itemAmt - 1;
  }
  cycleItems();
});

.container {
  max-width: 200px;
  background-color: black;
  margin: 0 auto;
  text-align: center;
  position: relative;
}
.container div {
  background-color: white;
  width: 100%;
  display: inline-block;
  display: none;
}
.container img {
  width: 100%;
  height: auto;
}

button {
  position: absolute;
}

.next {
  right: 5px;
}

.prev {
  left: 5px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<section class="demo">
  <button class="next">Next</button>
  <button class="prev">Previous</button>
  <div class="container">
    <div style="display: inline-block;">
      <img src="https://placeimg.com/400/200/people"/>
    </div>
    <div>
     <img src="https://placeimg.com/400/200/any"/>
    </div>
    <div>
      <img src="https://placeimg.com/400/200/nature"/>
    </div>
    <div>
      <img src="https://placeimg.com/400/200/architecture"/>
    </div>
    <div>
      <img src="https://placeimg.com/400/200/animals"/>
    </div>
    <div>
      <img src="https://placeimg.com/400/200/people"/>
    </div>
    <div>
      <img src="https://placeimg.com/400/200/tech"/>
    </div>
  </div>
</section>

Answer 1

您可以使用 .fadeIn()来自 jQuery。

item.fadeIn();

运行这段代码:

var currentIndex = 0,
  items = $('.container div'),
  itemAmt = items.length;

function cycleItems() {
  var item = $('.container div').eq(currentIndex);
  items.hide();
  item.fadeIn();//css('display','inline-block');
}

var autoSlide = setInterval(function() {
  currentIndex += 1;
  if (currentIndex > itemAmt - 1) {
    currentIndex = 0;
  }
  cycleItems();
}, 3000);

$('.next').click(function() {
  clearInterval(autoSlide);
  currentIndex += 1;
  if (currentIndex > itemAmt - 1) {
    currentIndex = 0;
  }
  cycleItems();
});

$('.prev').click(function() {
  clearInterval(autoSlide);
  currentIndex -= 1;
  if (currentIndex < 0) {
    currentIndex = itemAmt - 1;
  }
  cycleItems();
});

.container {
  max-width: 200px;
  background-color: black;
  margin: 0 auto;
  text-align: center;
  position: relative;
}
.container div {
  background-color: white;
  width: 100%;
  display: inline-block;
  display: none;
}
.container img {
  width: 100%;
  height: auto;
}

button {
  position: absolute;
}

.next {
  right: 5px;
}

.prev {
  left: 5px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<section class="demo">
  <button class="next">Next</button>
  <button class="prev">Previous</button>
  <div class="container">
    <div style="display: inline-block;">
      <img src="https://placeimg.com/400/200/people"/>
    </div>
    <div>
     <img src="https://placeimg.com/400/200/any"/>
    </div>
    <div>
      <img src="https://placeimg.com/400/200/nature"/>
    </div>
    <div>
      <img src="https://placeimg.com/400/200/architecture"/>
    </div>
    <div>
      <img src="https://placeimg.com/400/200/animals"/>
    </div>
    <div>
      <img src="https://placeimg.com/400/200/people"/>
    </div>
    <div>
      <img src="https://placeimg.com/400/200/tech"/>
    </div>
  </div>
</section>