夜间模式的开启与关闭，父模板的制作
夜间模式的开启与关闭
- 放置点击的按钮或图片。
- 定义开关切换函数。
- onclick函数调用。
父模板的制作
- 制作网站网页共有元素的父模板html，包括顶部导航，中间区块划分，底部导航，底部说明等。
- 汇总相关的样式形成独立的css文件。
- 汇总相关的js代码形成独立的js文件。
- 形成完整的base.html+css+js
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <link href="https://cdn.bootcss.com/bootstrap/4.0.0-beta/css/bootstrap.css" rel="stylesheet"> <link href="https://cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.css" rel="stylesheet"> <link rel="stylesheet" href="bootstrap.css"> <script> function mySitch(){ var myele=document.getElementById("on_off") if (myele.src.match("timg")){ myele.src="timg.jpg"; document.getElementById("myBody").style.background="gray" document.getElementById("demo").style.color="white" } else { myele.src="timg(1).jpg"; document.getElementById("myBody").style.background="white" document.getElementById("demo").style.color="gray" } } </script> </head> <body id="myBody"> <header> <nav class="navbar navbar-expand-lg navbar-light bg-light "> <img width="30px" src="timg.jpg" onclick="mySitch()" id="on_off"> <a class="navbar-brand" href="#">Navbar</a> <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button> <div class="collapse navbar-collapse" id="navbarSupportedContent"> <ul class="navbar-nav mr-auto"> <li class="nav-item active"> <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item dropdown"> <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> Dropdown </a> <div class="dropdown-menu" aria-labelledby="navbarDropdown"> <a class="dropdown-item" href="#">Action</a> <a class="dropdown-item" href="#">Another action</a> <div class="dropdown-divider"></div> <a class="dropdown-item" href="#">Something else here</a> </div> </li> <li class="nav-item"> <a class="nav-link disabled" href="#">Disabled</a> </li> </ul> <form class="form-inline my-2 my-lg-0"> <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search"> <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button> </form> </div> </nav> </header> <main style="height: 680px;" > </main> <footer> <nav class=" navbar-light bg-dark text-center"> <a href="">ddd</a> </nav> </footer> </body> </html>
