共计 3884 个字符，预计需要花费 10 分钟才能阅读完成。
话不多说，先上效果图
受制于网站的容量，最多只能上传 4MB 的动图，所以我调快了动画的速度，缩短了动图的工夫，实际上动画是很弛缓的。
说到动画，家喻户晓，突变是不可能应用通过 keyframes 实现动画过渡成果的，只会忽然的扭转色彩。
例如，如果关键帧代码如下
@keyframes test {
0%{background: linear-gradient(60deg, rgba(84,58,183,1) 0%, rgba(0,172,193,1) 100%);
}
100%{background: linear-gradient(60deg, rgb(173, 162, 218) 0%, rgb(201, 14, 189) 100%);
}
}
能够看到背景色并不会平滑的过渡，只会十分生硬忽然的色彩变动，显然不是咱们想要的成果。
换个想法，没必要局限于在 keyframes 中应用 linear-gradient 来实现突变动画成果，linear-gradient不可能平滑过渡，然而 position 能够呀，所以咱们先实现这样的成果
html 代码如下
<div class="header">
<div class="inner-header flex">
<svg version="1.1" class="logo" baseProfile="tiny" id="Layer_1" xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" viewBox="0 0 500 500" xml:space="preserve">
<path fill="#FFFFFF" stroke="#000000" stroke-width="10" stroke-miterlimit="10" d="M57,283" />
<g>
<path fill="#fff"
d="M250.4,0.8C112.7,0.8,1,112.4,1,250.2c0,137.7,111.7,249.4,249.4,249.4c137.7,0,249.4-111.7,249.4-249.4
C499.8,112.4,388.1,0.8,250.4,0.8z M383.8,326.3c-62,0-101.4-14.1-117.6-46.3c-17.1-34.1-2.3-75.4,13.2-104.1
c-22.4,3-38.4,9.2-47.8,18.3c-11.2,10.9-13.6,26.7-16.3,45c-3.1,20.8-6.6,44.4-25.3,62.4c-19.8,19.1-51.6,26.9-100.2,24.6l1.8-39.7 c35.9,1.6,59.7-2.9,70.8-13.6c8.9-8.6,11.1-22.9,13.5-39.6c6.3-42,14.8-99.4,141.4-99.4h41L333,166c-12.6,16-45.4,68.2-31.2,96.2 c9.2,18.3,41.5,25.6,91.2,24.2l1.1,39.8C390.5,326.2,387.1,326.3,383.8,326.3z" />
</g>
</svg>
</div>
<div>
<svg class="waves" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
viewBox="0 24 150 28" preserveAspectRatio="none" shape-rendering="auto">
<defs>
<path id="gentle-wave" d="M-160 44c30 0 58-18 88-18s 58 18 88 18 58-18 88-18 58 18 88 18 v44h-352z" />
</defs>
<g class="parallax">
<use xlink:href="#gentle-wave" x="48" y="0" fill="rgba(255,255,255,0.7" />
<use xlink:href="#gentle-wave" x="48" y="3" fill="rgba(255,255,255,0.5)" />
<use xlink:href="#gentle-wave" x="48" y="5" fill="rgba(255,255,255,0.3)" />
<use xlink:href="#gentle-wave" x="48" y="7" fill="#fff" />
</g>
</svg>
</div>
</div>css 代码如下
body {margin:0;}
h1 {
font-family: 'Lato', sans-serif;
font-weight:300;
letter-spacing: 2px;
font-size:48px;
user-select: none;
}
p {
font-family: 'Lato', sans-serif;
letter-spacing: 1px;
font-size:14px;
color: #333333;
}
.header {
position: relative;
text-align: center;
background: linear-gradient(45deg, rgb(84 58 181), rgb(84 58 181 / 70%), rgb(0 172 193 / 70%), rgb(87 228 246),rgb(255 255 255));
color: white;
box-shadow: 1px 1px 6px #00000087;
}
.logo {
width:50px;
fill:white;
padding-right:15px;
display:inline-block;
vertical-align: middle;
}
.inner-header {
height:65vh;
width:100%;
margin: 0;
padding: 0;
}
.flex { /*Flexbox for containers*/
display: flex;
justify-content: center;
align-items: center;
text-align: center;
}
.waves {
position:relative;
width: 100%;
height:15vh;
margin-bottom:-7px; /*Fix for safari gap*/
min-height:100px;
max-height:150px;
}
.content {
position:relative;
height:20vh;
text-align:center;
background-color: white;
}
/* Animation */
.parallax > use {animation: move-forever 25s cubic-bezier(.55,.5,.45,.5) infinite;
}
.parallax > use:nth-child(1) {
animation-delay: -2s;
animation-duration: 7s;
}
.parallax > use:nth-child(2) {
animation-delay: -3s;
animation-duration: 10s;
}
.parallax > use:nth-child(3) {
animation-delay: -4s;
animation-duration: 13s;
}
.parallax > use:nth-child(4) {
animation-delay: -5s;
animation-duration: 20s;
}
@keyframes move-forever {
0% {transform: translate3d(-90px,0,0);
}
100% {transform: translate3d(85px,0,0);
}
}
/*Shrinking for mobile*/
@media (max-width: 768px) {
.waves {
height:40px;
min-height:40px;
}
.content {height:30vh;}
h1 {font-size:24px;}
}
再而后，咱们把背景放大，也就是在 .header 中加上这一行代码 background-size: 400%
而后写一个背景挪动的关键帧动画
@keyframes gradient {
0% {background-position: 0% 50%;}
50% {background-position: 100% 50%;}
100% {background-position: 0% 50%;}
}利用到 .head 中
.header {
position: relative;
text-align: center;
background: linear-gradient(45deg, rgb(84 58 181), rgb(84 58 181 / 70%), rgb(0 172 193 / 70%), rgb(87 228 246),rgb(255 255 255));
background-size: 400%;
color: white;
box-shadow: 1px 1px 6px #00000087;
animation: gradient 5s linear infinite;
}调整动画速度只有批改 animation 中的 5s 就行了，轻易改成什么数字就行。
底部的突变波纹动画来自于该网站
https://codepen.io/goodkatz/p…
正文完