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Better CSS #13

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112 changes: 2 additions & 110 deletions css-prime.html
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,117 +1,9 @@
<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet" href="css/style.css">
<meta charset="UTF-8">
<title>CSS Prime</title>
<style>
body {
/*用body元素的counter-reset属性重置三个计数器以使它们的作用域在整个body内*/
counter-reset: nature-count prime-count nonprime-count;
display: flex;
flex-direction: column;
}

li {
list-style-type: none;
display: inline-block;
}

/*在before伪元素中插入计数器的值以实现数值递增*/
li::before {
content: counter(nature-count) ',';
}
li:last-child::before {
content: counter(nature-count);/*最后一个元素不需要逗号分隔*/
}

/*合数项选择器*/
li:first-child,
li:nth-child(2n + 4),
li:nth-child(3n + 6),
li:nth-child(5n + 10),
li:nth-child(7n + 14),
li:nth-child(11n + 22),
li:nth-child(13n + 26),
li:nth-child(17n + 34),
li:nth-child(19n + 38),
li:nth-child(23n + 46),
li:nth-child(29n + 58),
li:nth-child(31n + 62) {
/*递增自然数与合数计数器*/
counter-increment: nature-count nonprime-count;
color: #ddd;/*合数变灰*/
/*如果想只显示素数项，可以把合数全部隐藏起来*/
/*display为none并不影响计数器的计数*/
/*display: none;*/
}
/*素数项选择器*/
li:not(:first-child):not(:nth-child(2n + 4)):not(:nth-child(3n + 6)):not(:nth-child(5n + 10)):not(:nth-child(7n + 14)):not(:nth-child(11n + 22)):not(:nth-child(13n + 26)):not(:nth-child(17n + 34)):not(:nth-child(19n + 38)):not(:nth-child(23n + 46)):not(:nth-child(29n + 58)):not(:nth-child(31n + 961)) {
/*递增自然数与素数计数器*/
counter-increment: nature-count prime-count;
color: red;/*素数变红*/
}

p.count {
order: -1;/*让p元素显示在ul的前面*/
}
p.count::before {
/*通过p标签的before伪元素插入统计结果*/
content: '前 ' counter(nature-count) ' 个自然数中，有 ' counter(nonprime-count) ' 个合数，' counter(prime-count) ' 个素数' ;
}
</style>
<!-- <style>
body {
counter-reset: count prime-count;
display: flex;
flex-direction: column;
}
ul {
/*text-align: center;*/
width: 90%;
margin: auto;
padding: 0;
}
li {
counter-increment: count;
list-style: none;
display: inline-block;
width: 50px;
text-align: right;
}
li::before {
content: counter(count, decimal-leading-zero);
}
li::after {
content: ', ';
}
li:first-child,
li:nth-child(2n + 4),
li:nth-child(3n + 6),
li:nth-child(5n + 10),
li:nth-child(7n + 14),
li:nth-child(11n + 22),
li:nth-child(13n + 26),
li:nth-child(17n + 34),
li:nth-child(19n + 38),
li:nth-child(23n + 46),
li:nth-child(29n + 58),
li:nth-child(31n + 62) {
color: #ddd;
}

li:not(:first-child):not(:nth-child(2n + 4)):not(:nth-child(3n + 6)):not(:nth-child(5n + 10)):not(:nth-child(7n + 14)):not(:nth-child(11n + 22)):not(:nth-child(13n + 26)):not(:nth-child(17n + 34)):not(:nth-child(19n + 38)):not(:nth-child(23n + 46)):not(:nth-child(29n + 58)):not(:nth-child(31n + 961)) {
color: red;
counter-increment: count prime-count;
/*font-size: 50px;*/
}

.count {
order: -1;
}
.count::before {
content: '前 ' counter(count) ' 个自然数中，共有 ' counter(prime-count) ' 个素数';
}
</style> -->
</head>
<body>
<p style="order:-2">使用纯CSS进行素数的判定与筛选。实现细节相关博文：<a href="https://zhuanlan.zhihu.com/p/24718254">https://zhuanlan.zhihu.com/p/24718254</a></p>
Expand Down Expand Up @@ -1124,7 +1016,7 @@
(function() {
var hm = document.createElement("script");
hm.src = "//hm.baidu.com/hm.js?2243d09d24f5e80836f6b9d3a08d9fb0";
var s = document.getElementsByTagName("script")[0];
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
})();
</script>
Expand Down
54 changes: 54 additions & 0 deletions style.css
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,54 @@
body {
/*用body元素的counter-reset属性重置三个计数器以使它们的作用域在整个body内*/
counter-reset: nature-count prime-count nonprime-count;
display: flex;
flex-direction: column;
}

li {
list-style-type: none;
display: inline-block;
}

/*在before伪元素中插入计数器的值以实现数值递增*/
li::before {
content: counter(nature-count) ',';
}
li:last-child::before {
content: counter(nature-count);/*最后一个元素不需要逗号分隔*/
}

/*合数项选择器*/
li:first-child,
li:nth-child(2n + 4),
li:nth-child(3n + 6),
li:nth-child(5n + 10),
li:nth-child(7n + 14),
li:nth-child(11n + 22),
li:nth-child(13n + 26),
li:nth-child(17n + 34),
li:nth-child(19n + 38),
li:nth-child(23n + 46),
li:nth-child(29n + 58),
li:nth-child(31n + 62) {
/*递增自然数与合数计数器*/
counter-increment: nature-count nonprime-count;
color: #ddd;/*合数变灰*/
/*如果想只显示素数项，可以把合数全部隐藏起来*/
/*display为none并不影响计数器的计数*/
/*display: none;*/
}
/*素数项选择器*/
li:not(:first-child):not(:nth-child(2n + 4)):not(:nth-child(3n + 6)):not(:nth-child(5n + 10)):not(:nth-child(7n + 14)):not(:nth-child(11n + 22)):not(:nth-child(13n + 26)):not(:nth-child(17n + 34)):not(:nth-child(19n + 38)):not(:nth-child(23n + 46)):not(:nth-child(29n + 58)):not(:nth-child(31n + 961)) {
/*递增自然数与素数计数器*/
counter-increment: nature-count prime-count;
color: red;/*素数变红*/
}

p.count {
order: -1;/*让p元素显示在ul的前面*/
}
p.count::before {
/*通过p标签的before伪元素插入统计结果*/
content: '前 ' counter(nature-count) ' 个自然数中，有 ' counter(nonprime-count) ' 个合数，' counter(prime-count) ' 个素数' ;
}