我用 CSS 制作了这颗星星，我喜欢它的方框阴影。 我需要在恒星星系中使用它，但是由于盒子阴影，它在有很多恒星的情况下变得很慢。页面滚动受到很大影响。 我尝试使用 PNG 图像而不是 DIV，它提高了性能，现在滚动没有问题。
但是，我找不到将这颗星星转换为 PNG 的方法。我检查过 HTML2Canvas，但它不支持阴影。 我能做的最好的事情就是截屏并删除空白背景以使其透明，但是由于阴影不透明，它看起来不干净。
任何帮助将不胜感激。
对我来说，最后一件事就是找到另一个用 SVG 制作的漂亮星星。但是，我认为这里有很多专家。请帮忙!
.holder {
position: absolute;
left: 0%;
top: 0%;
width: 100%;
height: 100%;
background-color: #000000;
}
.star {
position: absolute;
left: 50%;
top: 50%;
width: 50px;
height: 50px;
transform: translateX(-50%) translateY(-50%);
}
.star div {
position: absolute;
left: 50%;
top: 50%;
width: 100%;
height: 100%;
transform: translateX(-50%) translateY(-50%) rotateX(-85deg) rotateZ(45deg);
background-color: #ffffff;
box-shadow:
0 0 10px #fff,
0 0 20px #fff,
0 0 30px #fff,
0 0 40px rgb(27, 53, 97),
0 0 70px rgb(27, 53, 97),
0 0 80px rgb(27, 53, 97),
0 0 100px rgb(27, 53, 97),
0 0 150px rgb(27, 53, 97);
}
.star div:nth-child(2) {
transform: translateX(-50%) translateY(-50%) rotateZ(90deg) rotateX(-85deg) rotateZ(45deg);
}
.star div:nth-child(3) {
width: 50%;
height: 50%;
transform: translateX(-50%) translateY(-50%) rotateZ(45deg) rotateX(-85deg) rotateZ(45deg);
}
.star div:nth-child(4) {
width: 50%;
height: 50%;
transform: translateX(-50%) translateY(-50%) rotateZ(-45deg) rotateX(-85deg) rotateZ(45deg);
}<div class="holder">
<div class="star"><div></div><div></div><div></div><div></div></div>
</div>最佳答案
下面是两个没有优化的png版本，使用这个页面优化tinypng和svg版本。它可能不是 100% 相同但非常接近:)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
body {
background-color: #000;
}
</style>
</head>
<body>
<svg width="100%" height="100%" viewBox="0 0 127 129" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" xmlns:serif="http://www.serif.com/" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:2;"><g id="lopatk"><use xlink:href="#_Image1" x="61.525" y="0" width="9.481px" height="128.976px" transform="matrix(0.948079,0,0,0.999817,-5.45697e-14,2.72848e-14)"/><use xlink:href="#_Image2" x="0" y="55.061" width="126.142px" height="18.979px" transform="matrix(0.993242,0,0,0.998877,-5.45697e-14,2.72848e-14)"/><path d="M97.182,64.511c0,0 -20.204,-2.312 -34.042,-2.312c-13.838,0 -34.18,2.174 -34.18,2.174c0,0 20.342,2.405 34.042,2.405c13.699,0 34.18,-2.267 34.18,-2.267Z" style="fill:#fff;"/><use xlink:href="#_Image3" x="53.642" y="26.492" width="18.979px" height="75.996px" transform="matrix(0.998877,0,0,0.999948,-5.45697e-14,2.72848e-14)"/><path d="M63.094,29.69c0,0 -2.312,20.611 -2.312,34.728c0,14.116 2.173,34.868 2.173,34.868c0,0 2.405,-20.752 2.405,-34.727c0,-13.976 -2.266,-34.869 -2.266,-34.869Z" style="fill:#fff;"/><use xlink:href="#_Image4" x="32.681" y="34.011" width="60.893px" height="60.978px" transform="matrix(0.99825,0,0,0.999646,-5.45697e-14,2.72848e-14)"/><path d="M50.888,52.354c0,0 8.017,6.387 12.949,11.319c4.932,4.933 11.417,12.949 11.417,12.949c0,0 -8.098,-6.403 -12.981,-11.286c-4.883,-4.883 -11.385,-12.982 -11.385,-12.982Z" style="fill:#fff;"/><use xlink:href="#_Image5" x="49.135" y="50.74" width="27.972px" height="27.891px" transform="matrix(0.99899,0,0,0.996114,-5.45697e-14,2.72848e-14)"/><path d="M75.254,52.354c0,0 -8.016,6.387 -12.949,11.319c-4.932,4.933 -11.417,12.949 -11.417,12.949c0,0 8.098,-6.403 12.982,-11.286c4.883,-4.883 11.384,-12.982 11.384,-12.982Z" style="fill:#fff;"/></g><defs><image id="_Image1" width="10px" height="129px" xlink:href="data:image/png;base64,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"/><image id="_Image2" width="127px" height="19px" 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</html>关于css - 将带有 box-shadow 的 CSS star 转换为 PNG 图像以提高性能，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57183803/