javascript - JQuery如何正确设置 slider 效果

Question

我想在 jQuery 中创建简单的背景图像 slider 。一切正常，除了动画。我认为它应该像这样:

1. 淡出图像
2. 在用户看不到时更改图像
3. 淡入新图像

但我得到了一些不同的东西，我觉得第一张照片发生了变化，然后图像淡出。

我试过delay()，没用，hide()，动画太不自然

这里我在jsfiddle中创建了示例，请看一下: https://jsfiddle.net/xpvt214o/375627/

$('.background').fadeOut(1000).css('background-image', 
'url('+images[whichone++]+')')
.fadeIn(1000);

我怎样才能改变这个？

$(document).ready(function(){
var images= ['https://images.pexels.com/photos/46710/pexels-photo-46710.jpeg?cs=srgb&dl=beach-sand-summer-46710.jpg&fm=jpg','https://images.pexels.com/photos/219998/pexels-photo-219998.jpeg?cs=srgb&dl=beach-birds-calm-219998.jpg&fm=jpg','https://images.pexels.com/photos/207962/pexels-photo-207962.jpeg?cs=srgb&dl=artistic-blossom-bright-207962.jpg&fm=jpg'];

var howmany = images.length;
var whichone = 0;

function slideSwitch(){
if(whichone >= howmany-1 ) { whichone = 0}
$('.background').fadeOut(1000).css('background-image', 'url('+images[whichone++]+')')
.fadeIn(1000);
}
	setInterval(slideSwitch, 5000);


});

.background{
   background: cover;
    position:fixed;
    width: 100%;
    height: 100%;
    left:0;
    top:0;
    background-image: url("https://images.pexels.com/photos/207962/pexels-photo-207962.jpeg?cs=srgb&dl=artistic-blossom-bright-207962.jpg&fm=jpg") ;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="background"></div>

<div class="content">

Answer 1

尝试如下所示

添加了 transition: background-image 2s; 并稍微更改了您的 js。此外，您的 background:cover 样式错误。它应该是 background-size: cover;

$(document).ready(function() {
  var images = ['https://images.pexels.com/photos/46710/pexels-photo-46710.jpeg?cs=srgb&dl=beach-sand-summer-46710.jpg&fm=jpg', 'https://images.pexels.com/photos/219998/pexels-photo-219998.jpeg?cs=srgb&dl=beach-birds-calm-219998.jpg&fm=jpg', 'https://images.pexels.com/photos/207962/pexels-photo-207962.jpeg?cs=srgb&dl=artistic-blossom-bright-207962.jpg&fm=jpg'];

  var howmany = images.length;
  var whichone = 0;

  function slideSwitch() {
    if (whichone >= howmany - 1) {
      whichone = 0
    }
    $('.background').css('background-image', 'url(' + images[whichone++] + ')');
  }
  setInterval(slideSwitch, 5000);


});

.background {
  background-size: cover;
  position: fixed;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  transition: background-image 2s;
  background-image: url("https://images.pexels.com/photos/207962/pexels-photo-207962.jpeg?cs=srgb&dl=artistic-blossom-bright-207962.jpg&fm=jpg");
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="background"></div>

<div class="content">