夜间模式的开启与关闭，父模板的制作

  1. 夜间模式的开启与关闭
    1. 放置点击的按钮或图片。
    2. 定义开关切换函数。
    3. onclick函数调用。
  2. 父模板的制作
    1. 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。
    2. 汇总相关的样式形成独立的css文件。
    3. 汇总相关的js代码形成独立的js文件。
    4. 形成完整的base.html+css+js 
      <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>夜晚模式</title>
    <script>
        function mySwitch(){
            var oBody=document.getElementById("myBody");
            var oOnoff=document.getElementById("myOnOff");
            if(oOnoff.src.match("bulbon")){
                oOnoff.src="https://www.runoob.com/images/pic_bulboff.gif";
                oBody.style.background="black";
                oBody.style.color="white";
            }else{
                oOnoff.src="https://www.runoob.com/images/pic_bulbon.gif";
                oBody.style.background="white";
                oBody.style.color="black";
            }
        }
    </script>
</head>
<body id="myBody">
<img id="myOnOff" onclick="mySwitch()" src="https://www.runoob.com/images/pic_bulbon.gif"　width="40px">
<script>
    document.write(Date())
</script>
</body>
</html>

      HTML

      <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>夜间模式</title>
    <link rel="stylesheet" type="text/css" href="../static/css/switch.css">
    <script src ="../static/js/switch.js"></script>
    <link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css">
    <script src="http://cdn.static.runoob.com/libs/jquery/2.1.1/jquery.min.js"></script>
    <script src="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body id="myBody">
 
<h2>Night</h2>
 
<nav>
    <img id="myOnOff" onclick="mySwitch()"
         src="https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=1241908247,1796600239&fm=200&gp=0.jpg" width="50px">
    <script>
        document.write(Date())
    </script>
<ul class="nav nav-pills">
    <li class="active"><a href="http://localhost:63342/20171102/templates/base.html?_ijt=o1hdmoofeia6snqa8m8effsoo4#">首页</a></li>
    <li><a href="https://baike.baidu.com/item/%E4%BA%94%E6%9C%88%E5%A4%A9/17011?fr=aladdin">百度百科</a></li>
    <li><a href="http://v.baidu.com/person_intro/?id=158809&video_uri=person_card">参加综艺</a></li>
    <li><a href="http://www.1905.com/mdb/star/224">电影作品</a></li>
    <li><a href="http://www.xiami.com/artist/3110">音乐作品</a></li>
    <li><a href="http://tieba.baidu.com/f?kw=%CE%E5%D4%C2%CC%EC&fr=ala0&loc=rec">贴吧</a></li>
</ul>
 
</nav>
<div class="area">
</div>
 
<div class="wuyuetian">
    <div class="img">
        <a href="http://tieba.baidu.com/p/1479820595"><img
                src="http://imgsrc.baidu.com/forum/w%3D580/sign=981b43943a292df597c3ac1d8c305ce2/4af8d72a6059252dd8df9bbf349b033b5ab5b946.jpg"></a>
        <div class="desc"><a href="http://tieba.baidu.com/p/1479820595">阿信 </a></div>
    </div>
 
    <div class="img">
        <a href="http://tieba.baidu.com/p/1479820595"><img
                src="http://imgsrc.baidu.com/forum/w%3D580/sign=e06f694f51da81cb4ee683c56267d0a4/3c50f3deb48f8c54d9ef44943a292df5e0fe7f4a.jpg"></a>
        <div class="desc"><a href="http://tieba.baidu.com/p/1479820595">石头</a></div>
    </div>
 
    <div class="img">
        <a href="http://tieba.baidu.com/p/1479820595"><img
                src="http://imgsrc.baidu.com/forum/w%3D580/sign=5fb4fe662e738bd4c421b239918a876c/2a13c8fcc3cec3fd790326ced688d43f87942749.jpg"></a>
        <div class="desc"><a href="http://tieba.baidu.com/p/1479820595">怪兽</a></div>
    </div>
 
   <div class="img">
        <a href="http://tieba.baidu.com/p/1479820595"><img
                src="http://imgsrc.baidu.com/forum/w%3D580/sign=a58b1295a8d3fd1f3609a232004f25ce/022297dda144ad347e82063cd0a20cf431ad8549.jpg"></a>
        <div class="desc"><a href="http://tieba.baidu.com/p/1479820595">玛莎</a></div>
    </div>
   <div class="img">
        <a href="http://tieba.baidu.com/p/1479820595"><img
                src="http://imgsrc.baidu.com/forum/w%3D580/sign=d5da0ab39b504fc2a25fb00dd5dce7f0/9af690529822720ef60764417bcb0a46f31fab46.jpg"></a>
        <div class="desc"><a href="http://tieba.baidu.com/p/1479820595">丸尾 </a></div>
    </div></body>
</html>

      js

      function mySwitch() {
    var oBody = document.getElementById("myBody");
    var oOnoff = document.getElementById("myOnOff");
    if (oOnoff.src.match("100x100")){
        oOnoff.src = "https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=1241908247,1796600239&fm=200&gp=0.jpg"
        oBody.style.background = "black";
        oBody.style.color ="white";
    }else {
        oOnoff.src = "https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=3952690403,2307372256&fm=200&gp=0.jpg"
        oBody.style.background ="white";
        oBody.style.color ="black";
    }

      css

      .img {
    border: 1px solid #cccccc;
     95px;
    margin: 5px;
    float: left;
 
}
 
div.img img {
     100%;
    height: auto;
}
 
div.desc {
    text-align: center;
    padding: 5px;
}
 
div.img:hover {
    border: 1px solid #000000;
}
 
.area {
    height: 300px;
}
 
 
.wuyuetian {
    height: 180px;
}
 
h2{
    color: red;
    font-family: 'Consolas', 'Deja Vu Sans Mono', 'Bitstream Vera Sans Mono', monospace;
}
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原文地址：https://www.cnblogs.com/xiaojiaqi/p/7774596.html