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前端css(完)

时间:2020-05-14 22:37:59      阅读:101      评论:0      收藏:0      [点我收藏+]

标签:opened   position   margin   验证   司机   并且   小米   play   link   

解决浮动带来的影响

# 浮动带来的影响
会造成父标签塌陷的问题

"""
解决浮动带来的影响 推导步骤
    1.自己加一个div设置高度
    2.利用clear属性
        #d4 {
            clear: left;  /*该标签的左边(地面和空中)不能有浮动的元素*/
        }
  3.通用的解决浮动带来的影响方法
      在写html页面之前 先提前写好处理浮动带来的影响的 css代码
      .clearfix:after {
            content: ‘‘;
            display: block;
            clear:both;
        }
    之后只要标签出现了塌陷的问题就给该塌陷的标签加一个clearfix属性即可
    上述的解决方式是通用的 到哪都一样 并且名字就叫clearfix
"""
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
        body {
            margin: 0;
        }
        #d1 {
            border: 3px solid black;
        }
        #d2 {
            height: 100px;
            width: 100px;
            background-color: red;
            float: left;
        }
        #d3 {
            height: 100px;
            width: 100px;
            background-color: greenyellow;
            float: left;
        }
        /*#d4 {*/
        /*    !*height: 50px;*!*/
        /*    clear: left;  !*该标签的左边(地面和空中)不能有浮动的元素*!*/
        /*}*/
        .clearfix:after {
            content: ‘‘;
            display: block;
            clear:both;
        }
    </style>
</head>
<body>
<div id="d1" class="clearfix">
    <div id="d2"></div>
    <div id="d3"></div>
<!--    <div id="d4"></div>-->
</div>
</body>
</html>

溢出属性

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
        p {
            height: 100px;
            width: 100px;
            border: 3px solid red;
            /*overflow: visible;  !*默认就是可见 溢出还是展示*!*/
            /*overflow: hidden;  !*溢出部分直接隐藏*!*/
            /*overflow: scroll;  !*设置成上下滚动条的形式*!*/
            /*overflow: auto;*/
        }
    </style>

</head>
<body>
    <p>我还在起始点  刚刚换上2档 准备发车!我还在起始点  刚刚换上2档 准备发车!我还在起始点  刚刚换上2档 准备发车!我还在起始点  刚刚换上2档 准备发车!我还在起始点  刚刚换上2档 准备发车!我还在起始点  刚刚换上2档 准备发车!我还在起始点  刚刚换上2档 准备发车!我还在起始点  刚刚换上2档 准备发车!我还在起始点  刚刚换上2档 准备发车!我还在起始点  刚刚换上2档 准备发车!我还在起始点  刚刚换上2档 准备发车!我还在起始点  刚刚换上2档 准备发车!我还在起始点  刚刚换上2档 准备发车!我还在起始点  刚刚换上2档 准备发车!</p>
</body>
</html>

溢出的应用

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
        body {
            margin: 0;
            background-color: #4e4e4e;
        }
        #d1 {
            height: 120px;
            width: 120px;
            border-radius: 50%;
            border: 5px solid white;
            margin: 20px auto;
            overflow: hidden;
        }
        #d1>img {
            /*max-width: 100%;*/
            width: 100%;
            /*占标签100%比例*/
        }
    </style>
</head>
<body>
<div id="d1">
    <img src="111.jpg" alt="">
</div>
</body>
</html>

定位

  • 静态

    所有的标签默认都是静态的static,无法改变位置

  • 相对定位(了解)

    相对于标签原来的位置做移动relative

  • 绝对定位(常用)

    相对于已经定位过的父标签做移动(如果没有父标签那么就以body为参照)

    eg:小米网站购物车

    当你不知道页面其他标签的位置和参数,只给了你一个父标签的参数,让你基于该标签左定位

  • 固定定位(常用)

    相对于浏览器窗口固定在某个位置

    eg:右侧小广告

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
        body {
            margin: 0;
        }
        #d1 {
            height: 100px;
            width: 100px;
            background-color: red;
            left: 50px;  /*从左往右   如果是负数 方向则相反*/
            top: 50px;  /*从上往下    如果是负数 方向则相反*/
            /*position: static;  !*默认是static无法修改位置*!*/
            position: relative;
            /*相对定位
            标签由static变为relative它的性质就从原来没有定位的标签变成了已经定位过的标签
            虽然你哪怕没有动 但是你的性质也已经改变了
            */
        }

        #d2 {
            height: 100px;
            width: 200px;
            background-color: red;
            position: relative;  /*已经定位过了*/
        }
        #d3 {
            height: 200px;
            width: 400px;
            background-color: yellowgreen;
            position: absolute;
            left: 200px;
            top: 100px;
        }

        #d4 {
            position: fixed;  /*写了fixed之后 定位就是依据浏览器窗口*/
            bottom: 10px;
            right: 20px;

            height: 50px;
            width: 100px;
            background-color: white;
            border: 3px solid black;
        }
    </style>
</head>
<body>
<!--    <div id="d1"></div>-->

<!--<div id="d2">-->
<!--    <div id="d3"></div>-->
<!--</div>-->

<div style="height: 500px;background-color: red"></div>
<div style="height: 500px;background-color: greenyellow"></div>
<div style="height: 500px;background-color: blue"></div>
<div id="d4">回到顶部</div>

</body>
</html>

ps:浏览器是优先展示文本内容的

验证浮动和定位是否脱离文档流(原来的位置是否还保留)

"""
浮动
相对定位
绝对定位
固定定位
"""
# 不脱离文档流
    1.相对定位
# 脱离文档流
    1.浮动
  2.绝对定位
  3.固定定位
  
<!--<div style="height: 100px;width: 200px;background-color: red;position: relative;left: 500px"></div>-->
<!--<div style="height: 100px;width: 200px;background-color: greenyellow"></div>-->

<!--<div style="height: 100px;width: 200px;background-color: red;"></div>-->
<!--<div style="height: 100px;width: 200px;background-color: greenyellow;position: absolute;left: 500px"></div>-->
<!--当没有父标签做到位 就参照与body-->
<!--<div style="height: 100px;width: 200px;background-color: blue;"></div>-->

<div style="height: 100px;width: 200px;background-color: red;"></div>
<div style="height: 100px;width: 200px;background-color: greenyellow;position: fixed;bottom: 10px;right: 20px"></div>
<div style="height: 100px;width: 200px;background-color: blue;"></div>

z-index模态框

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
        body {
            margin: 0;
        }
        .cover {
            position: fixed;
            left: 0;
            top: 0;
            right: 0;
            bottom: 0;
            background-color: rgba(0,0,0,0.5);
            z-index: 99;
        }
        .modal {
            background-color: white;
            height: 200px;
            width: 400px;
            position: fixed;
            left: 50%;
            top: 50%;
            z-index: 100;
            margin-left: -200px;
            margin-top: -100px;

        }
        h1  {
            text-align: center;
        }

        #d1, #d2 {
            text-align: center;
        }
        button {
            margin-bottom: 10px;
            margin-left: 40%;
        }
    </style>
</head>
<body>
<div>这是最底层的页面内容</div>
<div class="cover"></div>
<div class="modal">
    <h1>登陆页面</h1>
    <p id="d1">username:<input type="text"></p>
    <p id="d2">password:<input type="text"></p>
    <button>点我点我~</button>
</div>
</body>
</html>

透明度opacity

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
        #d1 {
            background-color: rgba(0,0,0,0.5);
        }
        #d2 {
            background-color: rgb(0,0,0);
            opacity: 0.5;
            color: blue;
        }
    </style>
</head>
<body>
    <p id="d1">111</p>
    <p id="d2">22asdasdasd2</p>
</body>
</html>

博客园页面搭建

技术图片
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>博客园</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="blog.css">
</head>
<body>
    <div class="blog-left">
        <div class="blog-avatar">
            <img src="111.jpg" alt="">
        </div>
        <div class="blog-title">
            <p>老司机的博客</p>
        </div>
        <div class="blog-info">
            <p>该老司机车速太快,什么都没有留下!</p>
        </div>
        <div class="blog-link">
            <ul>
                <li><a href="">关于我</a></li>
                <li><a href="">微博</a></li>
                <li><a href="">微信公众号</a></li>
            </ul>
        </div>
        <div class="blog-tag">
            <ul>
                <li><a href="">#Python</a></li>
                <li><a href="">#Java</a></li>
                <li><a href="">#Golang</a></li>
            </ul>
        </div>
    </div>
    <div class="blog-right">
        <div  class="article">
            <div class="article-title">
                <span class="title">论开车的重要性</span>
                <span class="date">2020/5/14</span>
            </div>
            <div class="article-body">
                <p>jason老师从来不开车,非常正儿八经的!</p>
            </div>
            <hr>
            <div class="article-bottom">
                <span>#Python&nbsp;&nbsp;</span>
                <span>#JavaScript</span>
            </div>
        </div>
        <div  class="article">
            <div class="article-title">
                <span class="title">论开车的重要性</span>
                <span class="date">2020/5/14</span>
            </div>
            <div class="article-body">
                <p>jason老师从来不开车,非常正儿八经的!</p>
            </div>
            <hr>
            <div class="article-bottom">
                <span>#Python&nbsp;&nbsp;</span>
                <span>#JavaScript</span>
            </div>
        </div>
        <div  class="article">
            <div class="article-title">
                <span class="title">论开车的重要性</span>
                <span class="date">2020/5/14</span>
            </div>
            <div class="article-body">
                <p>jason老师从来不开车,非常正儿八经的!</p>
            </div>
            <hr>
            <div class="article-bottom">
                <span>#Python&nbsp;&nbsp;</span>
                <span>#JavaScript</span>
            </div>
        </div>
        <div  class="article">
            <div class="article-title">
                <span class="title">论开车的重要性</span>
                <span class="date">2020/5/14</span>
            </div>
            <div class="article-body">
                <p>jason老师从来不开车,非常正儿八经的!</p>
            </div>
            <hr>
            <div class="article-bottom">
                <span>#Python&nbsp;&nbsp;</span>
                <span>#JavaScript</span>
            </div>
        </div>
        <div  class="article">
            <div class="article-title">
                <span class="title">论开车的重要性</span>
                <span class="date">2020/5/14</span>
            </div>
            <div class="article-body">
                <p>jason老师从来不开车,非常正儿八经的!</p>
            </div>
            <hr>
            <div class="article-bottom">
                <span>#Python&nbsp;&nbsp;</span>
                <span>#JavaScript</span>
            </div>
        </div>
        <div  class="article">
            <div class="article-title">
                <span class="title">论开车的重要性</span>
                <span class="date">2020/5/14</span>
            </div>
            <div class="article-body">
                <p>jason老师从来不开车,非常正儿八经的!</p>
            </div>
            <hr>
            <div class="article-bottom">
                <span>#Python&nbsp;&nbsp;</span>
                <span>#JavaScript</span>
            </div>
        </div>
        <div  class="article">
            <div class="article-title">
                <span class="title">论开车的重要性</span>
                <span class="date">2020/5/14</span>
            </div>
            <div class="article-body">
                <p>jason老师从来不开车,非常正儿八经的!</p>
            </div>
            <hr>
            <div class="article-bottom">
                <span>#Python&nbsp;&nbsp;</span>
                <span>#JavaScript</span>
            </div>
        </div>
        <div  class="article">
            <div class="article-title">
                <span class="title">论开车的重要性</span>
                <span class="date">2020/5/14</span>
            </div>
            <div class="article-body">
                <p>jason老师从来不开车,非常正儿八经的!</p>
            </div>
            <hr>
            <div class="article-bottom">
                <span>#Python&nbsp;&nbsp;</span>
                <span>#JavaScript</span>
            </div>
        </div>
        <div  class="article">
            <div class="article-title">
                <span class="title">论开车的重要性</span>
                <span class="date">2020/5/14</span>
            </div>
            <div class="article-body">
                <p>jason老师从来不开车,非常正儿八经的!</p>
            </div>
            <hr>
            <div class="article-bottom">
                <span>#Python&nbsp;&nbsp;</span>
                <span>#JavaScript</span>
            </div>
        </div>
        <div  class="article">
            <div class="article-title">
                <span class="title">论开车的重要性</span>
                <span class="date">2020/5/14</span>
            </div>
            <div class="article-body">
                <p>jason老师从来不开车,非常正儿八经的!</p>
            </div>
            <hr>
            <div class="article-bottom">
                <span>#Python&nbsp;&nbsp;</span>
                <span>#JavaScript</span>
            </div>
        </div>
    </div>
</body>
</html>
html端
技术图片
/*这是博客园首页的样式文件*/

/*通用样式*/
body {
    margin: 0;
    background-color: #eeeeee;
}
a {
    text-decoration: none;
}
ul {
    list-style-type: none;
    padding-left: 0;
}
/*左侧样式*/
.blog-left {
    float: left;
    width: 20%;
    height: 100%;
    /*position: fixed;*/
    background-color: #4e4e4e;
}

.blog-avatar {
    height: 200px;
    width: 200px;
    border-radius: 50%;
    border: 5px solid white;
    margin: 20px auto;
    overflow: hidden;
}
.blog-avatar img {
    max-width: 100%;
}

.blog-title,.blog-info {
    color: darkgray;
    font-size: 18px;
    text-align: center;
}

.blog-link,.blog-tag {
    font-size: 24px;
}

.blog-link a,.blog-tag a {
    color: darkgray;
}

.blog-link a:hover,.blog-tag a:hover {
    color: white;
}

.blog-link ul,.blog-tag ul {
    text-align: center;
    margin-top: 100px;
}


/*右侧样式*/
.blog-right {
    float: left;
    width: 80%;
    height: 1000px;
}

.article {
    background-color: white;
    margin: 20px 40px 10px 10px;
    box-shadow: 5px 5px 5px rgba(0,0,0,0.5);
}

.title {
    font-size: 36px;
}
.date {
    float: right;
    margin: 20px 20px;
    font-weight: bolder;
}
.article-title {
    border-left: 8px solid red;
    text-indent: 16px;
}

.article-body {
    font-size: 18px;
    text-indent: 30px;
    /*border-bottom: 1px solid black;*/
}

.article-bottom {
    padding-left: 30px;
    padding-bottom: 10px;
}
blog.css

 

前端css(完)

标签:opened   position   margin   验证   司机   并且   小米   play   link   

原文地址:https://www.cnblogs.com/BoyGc/p/12891675.html

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