英文:
Explain "document.styleSheets[0].cssRules[0].style;"
问题
document.styleSheets[0].cssRules[0].style;
这段代码用于访问文档中第一个样式表的第一个 CSS 规则的样式属性。
* {
padding: 0;
margin: 0;
box-sizing: border-box;
font-family:'Times New Roman', Times, serif;
}
@keyframes fadeIn {
from {
opacity: 0;
}
to {
opacity: 1;
}
}
body{
background-color: rgb(216, 54, 54);
}
.wrapper {
width: 400px;
position: absolute;
transform: translate(50%,50%);
bottom: 50%;
right: 50%;
/* animation: fadeIn 2s ease-in; */
}
这段代码是一个示例 CSS 样式表，其中包含了一些常见的 CSS 规则和属性，例如设置页面的默认样式，定义了一个名为 "fadeIn" 的 CSS 动画，以及设置了页面背景颜色和一个名为 "wrapper" 的元素的样式。这个示例用于说明前面的代码是如何访问 CSS 样式规则中的样式属性的。
英文:
Can anyone explain the block of code:
document.styleSheets[0].cssRules[0].style;
It will be good, if you use the below code as an example to explain:
* {
padding: 0;
margin: 0;
box-sizing: border-box;
font-family:'Times New Roman', Times, serif;
}
@keyframes fadeIn {
from {
opacity: 0;
}
to {
opacity: 1;
}
}
body{
background-color: rgb(216, 54, 54);
}
.wrapper {
width: 400px;
position: absolute;
transform: translate(50%,50%);
bottom: 50%;
right: 50%;
/* animation: fadeIn 2s ease-in; */
}
i just want to understand the code, I found it on net.
答案1
得分: 1
document是您的document对象，您可以从中访问样式表。document.styleSheets是一个只读属性，返回一个 StyleSheetList。请参阅 https://developer.mozilla.org/en-US/docs/Web/API/Document/styleSheetsdocument.styleSheets[0]从样式表列表中提取第一个样式表。document.styleSheets[0].cssRules是一个 CSSRuleList 只读属性，参见 https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleSheet/cssRulesdocument.styleSheets[0].cssRules[0]是 CSSRuleList 中的第一个 CSSRule 对象。document.styleSheets[0].cssRules[0].style是给定 CSSRule 对象的样式。
您可以按照以下代码片段进行探索：
console.log(document.styleSheets[0].cssRules[0].style);
* {
padding: 0;
margin: 0;
box-sizing: border-box;
font-family: 'Times New Roman', Times, serif;
}
@keyframes fadeIn {
from {
opacity: 0;
}
to {
opacity: 1;
}
}
body {
background-color: rgb(216, 54, 54);
}
.wrapper {
width: 400px;
position: absolute;
transform: translate(50%, 50%);
bottom: 50%;
right: 50%;
/* animation: fadeIn 2s ease-in; */
}
英文:
documentis yourdocumentobject from which you can reach your stylesheetsdocument.styleSheetsis a read-only property that returns a StyleSheetList. See https://developer.mozilla.org/en-US/docs/Web/API/Document/styleSheetsdocument.styleSheets[0]extracts the first stylesheet from the stylesheetlistdocument.styleSheets[0].cssRulesis a CSSRuleList read-only property, see https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleSheet/cssRulesdocument.styleSheets[0].cssRules[0]is the first CSSRule object in the CSSRuleListdocument.styleSheets[0].cssRules[0].styleis the style of the given CSSRule object
You can explore this as per the snippet below:
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
console.log(document.styleSheets[0].cssRules[0].style);
<!-- language: lang-css -->
* {
padding: 0;
margin: 0;
box-sizing: border-box;
font-family:'Times New Roman', Times, serif;
}
@keyframes fadeIn {
from {
opacity: 0;
}
to {
opacity: 1;
}
}
body{
background-color: rgb(216, 54, 54);
}
.wrapper {
width: 400px;
position: absolute;
transform: translate(50%,50%);
bottom: 50%;
right: 50%;
/* animation: fadeIn 2s ease-in; */
}
<!-- end snippet -->
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