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iframe与css基础
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iframe写一个简单的小后台

代码

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.   <meta charset="UTF-8">
  5.   <meta name="viewport" content="width=device-width, initial-scale=1.0">
  6.   <title>Document</title>
  7. </head>
  8. <body>
  9. <div>网站后台管理系统</div>
  10. <div>
  11.   <a href="https://www.php.cn/course/list/1.html" target="content">HTML</a>
  12.   <a href="https://www.php.cn/course/list/2.html" target="content">javaScript</a>
  13.   <a href="https://www.php.cn/course/list/2.html" target="content">javaScript</a>
  14.   <a href="https://www.php.cn/course/list/10.html" target="content">网站建设</a>
  15.   <a href="https://www.php.cn/course/list/7.html" target="content">ASP.NET</a>
  16.   <a href="https://www.php.cn/course/list/4.html" target="content">数据库</a>
  17. </div>
  18. <div>
  19.   <iframe srcdoc="点击上方链接" name="content" width="1000" height="700"></iframe>
  20. </div>
  21. </body>
  22. </html>

关于css选择器优先级

  • ID选择器>class选择器>标签选择器 ，如果需要标签选择器权重最高，可添加!important提权。
  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  6.     <title>Document</title>
  7. </head>
  8. <style>
  9.     /* class选择器 */
  10. .one{
  11.     color: red;
  12. }
  13. /* ID选择器 */
  14. #two {
  15.     color: blue;
  16. }
  17. /* 标签选择器 */
  18. h3 {
  19.     color: pink !important;
  20. }
  21. </style>
  22. <body>
  24. <h1 class="one">标签选择器</h1>
  25. <h2 id="two">ID选择器</h2>
  26. <h3>标签选择器</h3>
  28. </body>
  29. </html>

关于元素样式

1 一个元素样式会受到四个级别声明的影响：

  • 继承的：根据元素在文档结构和层级关系确定它最终的样式
  • 浏览器：用户代理样式，大多数浏览器表现基本一致
  • 自定义: HTML文档中<style>标签
  • 行内样式：写在标签的<style>属性中

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：
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