在我之前的问题中，在（Jan）的帮助下，我解决了自动背景更改的问题。
我之前的问题：使用JavaScript和CSS实现自动背景更改
但是当背景更改时，颜色的跳跃是可见的，我希望颜色的变化可以无缝且缓慢地进行。
2
895var i = 0;
function changeBackgroundColor() {
var background = document.getElementById("background");
if (i % 2 === 0) {
background.classList.remove("background-body");
} else {
background.classList.add("background-body");
}
i = i + 1;
}
setInterval(changeBackgroundColor, 3 * 1000);
html,body{
width: 100%;
overflow-x: hidden !important;
height: 100%;
overflow-y: hidden !important;
}
#background{
width: 100%;
height: 100%;
background: #39c787;
background-image: -webkit-gradient(linear, 15% 0%, 75% 84%, from(#ca83ddc4), to(#7874e3f3), color-stop(70%, #dfa450ab));
transition: all 5s ease;
-webkit-transition: all 5s ease;
-moz-transition: all 5s ease;
-o-transition: all 5s ease;
-ms-transition: all 5s ease;
}
.background-body{
background: #e0922d !important;
background-image: -webkit-gradient(linear, 15% 0%, 75% 84%, from(#9283ddc4), to(#22ff12d1), color-stop(70%, #c550dfab)) !important;
transition: all 5s ease;
-webkit-transition: all 5s ease;
-moz-transition: all 5s ease;
-o-transition: all 5s ease;
-ms-transition: all 5s ease;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <body id="background"></body>
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要使背景颜色平滑变化，您需要将过渡属性添加到background-color属性中。以下代码可以实现这一效果：
#background{ width: 100%; height: 100%; background: #39c787; background-image: -webkit-gradient(linear, 15% 0%, 75% 84%, from(#ca83ddc4), to(#7874e3f3), color-stop(70%, #dfa450ab)); transition: background-color 5s ease; -webkit-transition: background-color 5s ease; -moz-transition: background-color 5s ease; -o-transition: background-color 5s ease; -ms-transition: background-color 5s ease; } .background-body{ background: #e0922d !important; background-image: -webkit-gradient(linear, 15% 0%, 75% 84%, from(#9283ddc4), to(#22ff12d1), color-stop(70%, #c550dfab)) !important; transition: background-color 5s ease; -webkit-transition: background-color 5s ease; -moz-transition: background-color 5s ease; -o-transition: background-color 5s ease; -ms-transition: background-color 5s ease; }使用一个绝对定位的伪元素，具有不同的背景，然后在其上进行不透明度的变化过渡。
function changeBackgroundColor() { document.body.classList.toggle("alt-background") setTimeout(changeBackgroundColor, 4000) } changeBackgroundColor()html, body { width: 100%; height: 100%; } body { position: relative; margin: 0; background-image: linear-gradient(135deg, rgba(131,58,180,1) 0%, rgba(253,29,29,1) 50%, rgba(252,176,69,1) 100%); } body::before { position: absolute; top: 0; left: 0; width: 100%; height: 100%; content: ''; background-image: linear-gradient(135deg, rgba(2,0,36,1) 0%, rgba(9,9,121,1) 35%, rgba(0,212,255,1) 100%); opacity: 0; transition: opacity 2s ease-in-out; } body.alt-background::before { opacity: 1; }