• HTML css


    一、整体布局

    1、创建一个html标签

    2、创建三个div标签(分别是网页的头部,中间,和底部三部分)

    3、一般都用class选择器

    4、用css给body标签加个 margin:0(用于消除body边框和浏览器间的空白部分)

    5、使div(块状)标签居中---------->先定义宽度,高度----------->margin:0 auto(自动离俩边距离相同)

    6、list-style: none; 去除无序列表前面的符号(不能除去有序列表的)

    7、padding:(1)上   (2)右   (3)下    (4)左             padding:(1)上下     (2) 左右

    8、去掉a标签下面的下划线------------------>text-decoration = none

    9、设置图片的高度用margin-top = xxxpx;

    10、line-height = 行高  ------------>文本上下居中

    11、text-again = center------------>文本左右居中

    12、设置透明度方法:1、opacity:0-1

               2、background:rgba(0,0,0,0-1)

    13、absolute 绝对定位,如果父标签中有reverse ,则相对于父标签进行定位,如果没有,则相对于body标签进行定位,脱离文档流,其下面的部分会顶上去

    14、cursor: pointer;  变小手

    二、标签种类

     dispaly:inline 变内联标签   ----------无法使用高度,宽度

    display:block  变块级标签

    display:inline-block 变内联标签 -----可以使用高度,宽度

    三、页面中的小图标(实际上是通过一面墙上的洞看图片中的图标,我们可以通过调节洞的大小和图片的位置来显示不同的样式)

    1、先定义洞口的大小  width:18px   height:16px

    2、通过backgroud-position:值1  值2   通过调整值1,值2的大小来移动位置来得到不同的图片

    四、z-index 在同一位置定义俩标签(都钉住,那么后面的标签会把前面的标签覆盖掉,这样我们就可以用z-index=xx的大小来决定位置)

    <div style="position: fixed; left:0; right:0;height: 50px; "></div>

    <div style="position: fixed; left:0; right:0;height: 50px; "></div>

    五、子类漂浮,父类背景消失问题(由于子类漂浮,无法支撑起父类)

        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .w{
                background-color: gold;
            }
            .w .item{
                float: left;
            }
        </style>
    </head>
    <body>
        <div class="w">
            <div class="item">111</div>
            <div class="item">222</div>
        </div>
    </body>
    </html>
    子类漂浮,父类背景无

    解决方法一:再新加一个标签,样式设置成clear = both

    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .w{
                background-color: gold;
            }
            .w .item{
                float: left;
            }
        </style>
    </head>
    <body>
        <div class="w">
            <div class="item">111</div>
            <div class="item">222</div>
            <div style="clear: both"></div>
        </div>
    </body>
    </html>
    加clear = both

    解决方法二:利用伪类

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .w{
                background-color: gold;
            }
            .w .item{
                float: left;
            }
            .w:after{
                content: "777";  #在标签后面加一个内联标签
                display: block;  #设置成块级标签,让其换行
                clear: both;     
                visibility: hidden;  #隐藏掉添加的部分
            }
        </style>
    </head>
    <body>
        <div class="w">
            <div class="item">111</div>
            <div class="item">222</div>
        </div>
    </body>
    </html>
    利用伪类

    六、hover

    1、hover后加选择器点上去以后俩个不同的东西同时变化的情况

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .c1{
                width: 300px;
                height: 50px;
                border: 2px solid transparent;
            }
            .c1:hover{   #表示点上去以后c1变化
                border: 2px solid rebeccapurple;      # rebeccapurple为透明色
            }
            .c1:hover .c2{    #表示点上去以后c1的变化的同时c2变化
                color: #e20052;
            }
        </style>
    </head>
    <body>
        <div class="c1">
            <span class="c2">123</span>
            <div class="c3">456</div>
        </div>
    </body>
    </html>
    同时变化

    static(静态) 没有特别的设定,遵循基本的定位规定,不能通过z-index进行层次分级

    relative(相对定位) 对象不可层叠、不脱离文档流,参考自身静态位置通过 top,bottom,left,right 定位,并且可以通过z-index进行层次分级。

    absolute(绝对定位) 脱离文档流,通过 top,bottom,left,right 定位。选取其最近一个最有定位设置的父级对象进行绝对定位,如果对象的父级没有设置定位属性,absolute元素将以body坐标原点进行定位,可以通过z-index进行层次分级。

    fixed(固定定位) 这里所固定的参照对像是可视窗口而并非是body或是父级元素。可通过z-index进行层次分级。

    2、鼠标点上去换背景

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .c1{
                position: relative;
                width: 200px;
                height: 200px;
                overflow: hidden;
            }
            .c2{
                position: absolute;   #设置以后脱离文档流
                left: 0;
                right: 0;               #对c1进行绝对定位,上下左右边距都为0,就设置成了一个和c1面积一样大小
                top: 0;
                bottom: 0;
                background: rgba(0,0,0, 0.7);   #设置背景色以及透明度
                visibility: hidden;             #隐藏这部分
            }
            .c1:hover .c2{                      # 点上c1后c2变化
                visibility: visible;            #鼠标点到c1上后c2显示
            }
            .c2{
                padding-left: 30px;
                padding-top: 10px;
                color: white;
            }
        </style>
    </head>
    <body>
        <div class="c1">
            <img src="1.png" alt="">
            <div class="c2">
                <div class="c3">ALEX</div>
                <div class="c4">1000</div>
            </div>
        </div>
    </body>
    </html>
    覆盖

    七、小三角

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .c1{
                display: inline-block;
                border-left: 30px solid saddlebrown;
                border-right: 30px solid red;
                border-top: 30px solid yellow;
                border-bottom: 30px solid firebrick;
            }
        </style>
    </head>
    <body>
        <div class="c1"></div>
    </body>
    </html>
    小尖角
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .up{
                display: inline-block;
                border: 30px solid transparent;
                border-bottom: 30px solid firebrick;
            }
            .up:hover{
                display: inline-block;
                border: 30px solid transparent;
                border-top: 30px solid firebrick;
            }
        </style>
    </head>
    <body>
        <div class="up"></div>
    </body>
    </html>
    使用伪类出现上下尖角
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .up{
                display: inline-block;
                border: 30px solid transparent;
                border-bottom: 30px solid firebrick;
            }
            .up:hover{
                display: inline-block;
                border: 30px solid transparent;
                border-top: 30px solid firebrick;
                margin-top: 30px;  #保证变化前后在同一位置
            }
        </style>
    </head>
    <body>
        <div class="up"></div>
    </body>
    </html>
    上下尖角变化实例

    对于块级标签,margin-top 允许出现负值,一直往上走,可以脱离屏幕
    对于内联标签,margin-top不允许出现负值,负值无效,不会脱离屏幕

    八、页面中的小图标

    1、自己用css画

    2、用别人的    http://fontawesome.io/3.2.1/icons/   下载并导入<link rel="stylesheet" href="font-awesome/css/font-awesome.css">

    九、目录格式

    HTML文件放到APP中

    css样式文件放到css文件夹中

    js文件放到script文件夹中

    下载的第三方插件放到plugin中 

    十、img默认是有边框的(如果加在a标签中间,a标签中的字体颜色会带给img的边框)

    解决方法:在样式中加一个img{border = 0 }  把边框提前设置为0

    十一、样式的就近原则

    如果给同一个标签的同一类型,设置俩个不同的属性,那么就按照样式的就近原则进行渲染

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .c2{
                color: #e20052;
            }
            .c1{
                color: gold;  #金色离标签近,所以使用这里的样式
            }
        </style>
    </head>
    <body>
        <div class="c1 c2">qqqqqqqqqqq</div>
    </body>
    </html>
    就近原则

    如果想要是某一样式不被改变的话,就在样式中添加 !important

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .c2{
                color: #e20052 !important;
            }
            .c1{
                color: gold;
            }
        </style>
    </head>
    <body>
        <div class="c1 c2">qqqqqqqqqqq</div>
    </body>
    </html>
    !important

    十二、布局

    1、对于上图中的布局的方法一:固定上面标题部分和左半部分

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            body{
                margin: 0;
            }
            .head{
                position: fixed;
                height: 40px;
                width: 100%;
                background-color: #9f9f9f;
                z-index: 10;    #不定的话不知道谁在上面
            }
            .body .l{
                position: fixed;
                width: 200px;
                background-color: bisque;
                top: 40px;
            }
            .body .r{
                position: absolute;
                left: 210px;
                right: 0;
                top: 40px;
                background-color: black;
                color: white;
            }
        </style>
    </head>
    <body>
        <div class="head"></div>
        <div class="body">
            <div class="l">
                <div>1</div><div>1</div><div>1</div><div>1</div><div>1</div><div>1</div>
                <div>1</div><div>1</div><div>1</div><div>1</div><div>1</div><div>1</div>
                <div>1</div><div>1</div><div>1</div><div>1</div><div>1</div><div>1</div>
            </div>
            <div class="r">
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
            </div>
        </div>
        <div class="foot"></div>
    </body>
    </html>
    固定上 左

    2、对右半部分进行操作(overflow = "auto")

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            body{
                margin: 0;
            }
            .head{
                height: 40px;
                width: 100%;
                background-color: #9f9f9f;
            }
            .body .l{
                width: 200px;
                background-color: bisque;
                top: 40px;
            }
            .body .r{
                position: absolute;
                left: 210px;
                right: 0;
                bottom: 0   #为了给显示的部分定义一个大小;
                top: 40px;
                background-color: black;
                color: white;
                overflow: auto; #超出的部分进行隐藏,滚动滑轮可见
            }
        </style>
    </head>
    <body>
        <div class="head"></div>
        <div class="body">
            <div class="l">
                <div>1</div><div>1</div><div>1</div><div>1</div><div>1</div><div>1</div>
                <div>1</div><div>1</div><div>1</div><div>1</div><div>1</div><div>1</div>
                <div>1</div><div>1</div><div>1</div><div>1</div><div>1</div><div>1</div>
            </div>
            <div class="r">
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
                <div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div><div>2</div>
            </div>
        </div>
        <div class="foot"></div>
    </body>
    </html>
    右半部分溢出操作

    十三、提示框

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .td{
                position: relative;
            }
            .div{
                position: absolute;
                margin-top: 10px;
                margin-left: 20px;
            }
            .inp{
                margin-top: -3px;
                margin-left: -4px;
            }
            .c1{
                position: absolute;
                border: 10px solid transparent;
                border-right: 10px solid darkgrey;
                margin-left: -26px;
                margin-top: 0px;
            }
        </style>
    </head>
    <body>
        <table>
            <tr>
                <td>第一行</td>
                <td>第二行</td>
                <td>第三行</td>
                <td><a href="111">删除</a></td>
                <td class="td">
                    <div class="c1"></div>
                    <input class="inp" type="submit" value="确定">
                    <input class="inp" type="submit" value="取消">
                </td>
            </tr>        <tr>
                <td>第一行</td>
                <td>第二行</td>
                <td>第三行</td>
                <td><a href="111">删除</a></td>
    
            </tr>        <tr>
                <td>第一行</td>
                <td>第二行</td>
                <td>第三行</td>
                <td><a href="111">删除</a></td>
            </tr>        <tr>
                <td>第一行</td>
                <td>第二行</td>
                <td>第三行</td>
                <td><a href="111">删除</a></td>
            </tr>
        </table>
    </body>
    </html>
    提示框

    十四、输入框

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .c{
                position: relative;
            }
            .c .c1{
                width: 150px;
                height: 20px;
                padding-left: 20px;
            }
            .c .c2{
                position: absolute;
                margin-left: 8px;
                margin-top: -22px;
            }
        </style>
    </head>
    <body>
        <div class="c">
            <input class="c1" type="text">
            <div class="c2">R</div>
        </div>
    </body>
    </html>
    输入框

    十五、模态对话框

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .c{
                position: fixed;
                left: 0;
                top:0;
                right: 0;
                bottom: 0;
                background:rgba(0,0,0,.7);
            }
            .d{
                position: fixed;
                width: 200px;
                height: 100px;
                background-color: white;
                top: 150px;
                left: 500px;
            }
        </style>
    </head>
    <body>
    <input type="submit" value="模态对话框">
        <div class="c"></div>
        <div class="d">asasasa</div>
    </body>
    </html>
    模态对话框

    十六、输入框加减操作

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
        <style>
            .a{
                height: 30px;
                width: 160px;
                border: 1px solid #dddddd;
            }
            .min{
                height: 30px;
                width: 30px;
                text-align: center;
                line-height: 30px;
                float: left;
                cursor: pointer;
            }
            .max{
                height: 30px;
                width: 30px;
                text-align: center;
                line-height: 30px;
                float: left;
                cursor: pointer;
            }
            .inp1{
                width: 98px;
                height: 30px;
                float: left;
                padding: 0;
                border: 0;
                border-left: 1px solid #dddddd;
                border-right: 1px solid #dddddd;
            }
    
        </style>
    </head>
    <body>
        <div class="a">
            <div class="min" onclick="min();">-</div>
            <div class="inp">
                <input id="count" value="0" class="inp1" type="text">
            </div>
            <div class="max" onclick="max();">+</div>
        </div>
    
        <script type="text/javascript">
            function min() {
                var old_str= document.getElementById("count").value;
                var old_int = parseInt(old_str);
                var new_int = old_int - 1;
                document.getElementById("count").value = new_int
            }
        function max() {
                var old_str= document.getElementById("count").value;
                var old_int = parseInt(old_str);
                var new_int = old_int + 1;
                document.getElementById("count").value = new_int
            }
        </script>
    </body>
    </html>
    输入框加减
  • 相关阅读:
    rmq +二分暴力 hdu 5726
    8.25 ccpc 比赛总结
    莫比乌斯反演题目总结
    HDU 4848 Wow! Such Conquering! (搜索+floyd)
    Codeforces 982 C Cut 'em all!(DFS)
    Codefoces 986C AND Graph(DFS)
    CodeForces 986A Fair(BFS)
    ACM经验贴
    Kattis A+B Problem(FFT)
    CF E. Porcelain (双向dp)
  • 原文地址:https://www.cnblogs.com/luxiaojun/p/5628381.html
Copyright © 2020-2023  润新知