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demo.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>问题</title>
<style>
.p1,
.p2,
.s1,
.s2,
.s5,
.s6 {
margin: 1em;
border: 1px solid green;
padding: 1em;
}
.p1 {font-size: 16px; line-height: 32px;}
.s1 {font-size: 2em;}
.s2 {font-size: 2em; line-height: 2em;}
.p2 {font-size: 16px; line-height: 2;}
.s5 {font-size: 2em;}
.s6 {font-size: 2em; line-height: 2em;}
</style>
</head>
<body>
<div class="p1">
我是p1
<div class="s1">我是s1<br></div>
<div class="s2">我是s2<br></div>
</div>
<div class="p2">
我是p2
<div class="s5">我是s5<br></div>
<div class="s6">我是s6<br></div>
</div>
<script>
var p1 = document.querySelector('.p1');
var p2 = document.querySelector('.p2');
var s1 = document.querySelector('.s1');
var s2 = document.querySelector('.s2');
var s5 = document.querySelector('.s5');
var s6 = document.querySelector('.s6');
var ruleList = document.styleSheets[0].cssRules;
function renderSetStyle(dom) {
var name = '.' + dom.className;
var arr = [].filter.call(ruleList, (x => x.selectorText === name));
if (arr.length > 0) {
dom.appendChild(document.createTextNode('我的css设置值是：' + arr[0].cssText));
dom.appendChild(document.createElement('br'));
}
}
function renderComputedStyle(dom) {
var cs = getComputedStyle(dom);
dom.appendChild(document.createTextNode('我的css计算值是：font-size: ' + cs.fontSize + '; line-height: ' + cs.lineHeight));
}
renderSetStyle(p1)
renderSetStyle(p2)
renderSetStyle(s1)
renderSetStyle(s2)
renderSetStyle(s5)
renderSetStyle(s6)
renderComputedStyle(p1)
renderComputedStyle(p2)
renderComputedStyle(s1)
renderComputedStyle(s2)
renderComputedStyle(s5)
renderComputedStyle(s6)
</script>
</body>
</html>