• h5-12


    1、复习

     1 <style>
     2         *{
     3             margin: 0;
     4             padding: 0;
     5         }
     6         a{
     7             display: block;
     8             width: 150px;
     9             height: 50px;
    10             background-color: #00ffff;
    11             font-size: 18px;
    12             font-family: "微软雅黑";
    13             line-height: 50px;
    14             text-align:center;
    15             color:#444;
    16             text-decoration:none;
    17         }
    18         a:hover{
    19             background-color: yellowgreen;
    20         }
    21         .box{
    22             width: 300px;
    23             height: 1200px;
    24             border:1px solid #000;
    25             background: fixed url(images/2.jpg) no-repeat 0 0 rgba(255,255,0,0.5);
    26         }
    27     </style>
     <a href="#" target="_blank">按钮</a>
        <!-- target="_blank"    作用:在新窗口中打开被链接文档 -->
        <div class="box"></div>

    2、相对定位  position  做微调时使用

     1 <style>
     2         *{
     3             margin: 0;
     4             padding: 0;
     5         }
     6         div{
     7             width: 100px;
     8             height: 100px;
     9             background: pink;
    10             margin-bottom: 10px;
    11         }
    12         .box{
    13             background: skyblue;
    14             position: relative; /* 设置定位为相对定位 相对于原来位置*/
    15             top: -50px; /* 正数往下 负数按该方向移动*/    /*或写做bottom:50px;*/
    16             /*left: 30px;*/
    17             right: -80px;    /*或写做left:80px;*/
    18         }
    19     </style>
    <div></div>
        <div class="box"></div>
        <div></div>
        <div></div>

     3、相对定位-制作导航栏特效

    <style>
            *{
                margin: 0;
                padding: 0;
            }
            ul{
                list-style: none;    /*去掉原点*/
                width: 960px;
                height: 40px;
                margin: 100px auto;/*
                overflow: hidden;*/
            }
            ul li{
                float: left;
                width: 160px;
                height: 40px;
                background: skyblue;
                text-align: center;
                line-height: 40px;    /*行高可以被继承*/
            }        
            ul li a{
                /*
                  a尺寸 160*40
                  块级元素不设置宽宽默认是父亲的100% 
                   160px
                  高度是继承父亲的行高 
                */
                display: block;
                text-decoration: none;
                color: #333;
            }
            ul li a:hover{
                position: relative;
                top: -3px; 
                border-top: 3px solid #ff0;
            }
        </style>
    <ul>
            <li><a href="#">首页</a></li>
            <li><a href="#">首页</a></li>
            <li><a href="#">首页</a></li>
            <li><a href="#">首页</a></li>
            <li><a href="#">首页</a></li>
            <li><a href="#">首页</a></li>
        </ul>

    如果去掉css中

     ul li a中  display: block;

    5、相对定位-文字微调

     1 <style>
     2         *{
     3             margin: 0;
     4             padding: 0;
     5         }
     6         p{
     7             width: 400px;
     8             border: 1px solid #000;
     9             font-size: 16px;
    10             line-height: 28px;
    11         }
    12         p span{
    13             position: relative;
    14             top: -5px;
    15             font-size: 12px;
    16             color: blue;
    17         }
    18     </style>
    <p>1988年,林丹开始接触羽毛球。<span>[1]</span> 1992年,进福建体校。<span>[2]</span>  1995年,进入福州八一体工队。<span>[3]</span> 2000年,进入国家队。<span>[4]</span>  2002年8月,登上国际羽联排名第一的位置。<span>[5]</span>  2005年,苏迪曼杯决赛中,第二场出场的林丹战胜了当时已是奥运冠军的陶菲克·希达亚特,赛后他行军礼致意也成为其标志性的动作之一。<span>[6]</span> </p>

     绝对定位  position:absolute;

     1 <style>
     2         *{
     3             margin: 0;
     4             padding: 0;
     5         }
     6         .demo{
     7             margin: 100px;
     8         }
     9         .demo div{
    10             width: 100px;
    11             height: 100px;
    12             background: pink;
    13             margin-bottom: 10px;
    14         }
    15 
    16     </style>
    <div class="demo">
            <div>1</div>
            <div class="box">2</div>
            <div>3</div>
            <div>4</div>
        </div>

    <style>
            *{
                margin: 0;
                padding: 0;
            }
            .demo{
                margin: 100px;
            }
            .demo div{
                width: 100px;
                height: 100px;
                background: pink;
                margin-bottom: 10px;
            }
            .demo .box{
                background: skyblue;
                position: absolute; /*绝对定位的元素脱离标准文档流 本案例中绝对定位参考点body*/
                top: 10px;
                left: 100px;
            }
        </style>

     绝对定位-body为参考元素的参考点

     1 <style>
     2         *{
     3             margin: 0;
     4             padding: 0;
     5         }
     6         .demo{
     7             height: 1200px;
     8             margin: 100px;
     9         }
    10         
    11         .demo .box{
    12             width: 100px;
    13             height: 100px;
    14             background: skyblue;
    15             position: absolute;
    16             bottom: 50px;
    17             left: 100px;
    18             /* right: 100px; */
    19         }
    20     </style>
    <div class="demo">        
            <div class="box"></div>        
        </div>

     1 <style>
     2         *{
     3             margin: 0;
     4             padding: 0;
     5         }
     6         .box1{
     7             position: relative; /*只设置定位是相对定位 并没有设置left top 还是在原来位置*/
     8             width: 400px;
     9             height: 400px;
    10             padding: 50px;
    11             border: 10px solid red;
    12         }
    13         .box2{
    14             position: absolute;
    15             top: 100px;
    16             left: 100px;
    17             width: 280px;
    18             height: 280px;
    19             padding: 50px;
    20             border: 10px solid green;
    21         }
    22         .box3{
    23             position: relative;
    24             width: 160px;
    25             height: 160px;
    26             padding: 50px;
    27             border: 10px solid blue;
    28         }
    29         p{
    30             position: absolute;
    31             top: 50px;
    32             left: 50px;
    33             width: 50px;
    34             height: 50px;
    35             background: gold;
    36         }
    37 
    38         /*
    39            绝对定位参考的是最近的带有定位(相对 绝对 固定任一)的祖先元素,假如祖先元素中没有任何定位元素
    40            则以body为参考
    41         */
    42     </style>
        <div class="box1">
            <div class="box2">
                <div class="box3">
                    <p></p>
                </div>
            </div>
        </div>

     绝对定位制作压盖

     1     <style>
     2         *{
     3             margin: 0;
     4             padding: 0;
     5         }
     6         .box{
     7             position: relative;
     8             width: 300px;
     9             height: 300px;
    10             padding: 20px;
    11             border: 1px solid #000;
    12             margin: 100px auto;
    13         }
    14         .box1{
    15             width: 300px;
    16             height: 300px;
    17             background: pink;
    18         }
    19         .box2{
    20             position: absolute;
    21             bottom: 40px;
    22             left: 140px;
    23             width: 60px;
    24             height: 20px;
    25             background: yellowgreen;
    26 
    27         }
    28     </style>
        <div class="box">
            <div class="box1"></div>
            <div class="box2"></div>
        </div>

     1     <style>
     2         *{
     3             margin: 0;
     4             padding: 0;
     5         }
     6         .box{
     7             position: relative;
     8             width: 700px;
     9             height: 300px;
    10             padding: 20px;
    11             border: 1px solid #000;
    12             margin: 100px auto;
    13         }
    14         .box1{
    15             width: 700px;
    16             height: 300px;
    17             background: pink;
    18         }
    19         .box2{
    20             position: absolute;
    21             bottom: 50%; /*170px*/
    22             left: 50%; /* 370px*/
    23             width: 60px;
    24             height: 20px;
    25             background: yellowgreen;
    26             margin-left: -30px;
    27             margin-bottom: -10px;
    28         }
    29     </style>
        <div class="box">
            <div class="box1"></div>
            <div class="box2"></div>
        </div>

     固定定位

     1 <style>
     2         *{
     3             margin: 0;
     4             padding: 0;
     5         }
     6         body{
     7             height: 3000px;
     8             background: url(images/3.jpg) repeat-y;
     9         }
    10         .box{
    11             position: fixed; /*以浏览器窗口做参考*/
    12             bottom: 100px;
    13             right: 100px;
    14             width: 100px;
    15             height: 100px;
    16             background: #ff0;
    17         }
    18         .demo{
    19             width: 200px;
    20             height: 200px;
    21             background: pink;
    22         }
    23     </style>
    <div class="box"></div>
        <div class="demo"></div>

     1     <style>
     2         *{
     3             margin: 0;
     4             padding: 0;
     5         }
     6         
     7         .box1{
     8             position: fixed;
     9             top: 100px;
    10             left: 100px;
    11             width: 100px;
    12             height: 100px;
    13             background: #ff0;
    14         }
    15         .box2{
    16             position: absolute;
    17             top: 50px;
    18             left: 50px;
    19             width: 150px;
    20             height: 150px;
    21             background: skyblue;
    22         }
    23         .demo{
    24             position: relative;
    25             width: 200px;
    26             height: 200px;
    27             background: pink;
    28         }
    29         /* 脱标的压在标准流上,脱标的谁在后谁在上面 */
    30     </style>
        <div class="demo"></div>
        <div class="box1"></div>
        <div class="box2"></div>

     自定义压盖顺序

     1     <style>
     2         *{
     3             margin: 0;
     4             padding: 0;
     5         }
     6 
     7         /*z-index调整层级关系 只对定位元素有效
     8           z-index 值越大 层级高
     9         */
    10         
    11         .box1{
    12             position: fixed;
    13             top: 100px;
    14             left: 100px;
    15             width: 100px;
    16             height: 100px;
    17             background: #ff0;
    18             z-index: 1;
    19         }
    20         .box2{
    21             position: absolute;
    22             top: 50px;
    23             left: 50px;
    24             width: 150px;
    25             height: 150px;
    26             background: skyblue;
    27             z-index: 1;
    28         }
    29         .demo{
    30             /*float: left;*/
    31             width: 200px;
    32             height: 200px;
    33             background: pink;
    34             z-index: 100; /*z-index无效*/
    35         }
    36     </style>
        <div class="box2"></div>
        <div class="box1"></div>
        <div class="demo"></div>

     自定义压盖顺序-父子都定位

     1     <style>
     2         *{
     3             margin: 0;
     4             padding: 0;
     5         }
     6         .box1{
     7             position: relative;
     8             width: 0;
     9             height: 0;
    10             z-index: 2;
    11         }
    12         .box2{
    13             position: relative;
    14             width: 0;
    15             height: 0;
    16             z-index: 3;
    17         }
    18         .small{
    19             position: absolute;
    20             top: 0;
    21             left: 0;
    22             width: 100px;
    23             height: 100px;
    24             background: #ff0;
    25             z-index: 333;
    26         }
    27         .big{
    28             position: absolute;
    29             top: 0;
    30             left: 0;
    31             width: 200px;
    32             height: 200px;
    33             background: yellowgreen;
    34             z-index: 2;
    35         }
    36     </style>
        <div class="box1">
            <div class="small"></div>
        </div>
        <div class="box2">
            <div class="big"></div>
        </div>

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  • 原文地址:https://www.cnblogs.com/qianfur/p/12450453.html
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