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表单和css选择器 2018_8_15作业
小程_武汉_214945
Original
629 people have browsed it

表单:

实例

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
    </head>
    <body>
    <form action="" method="get">   <!--get/post提交方式-->
        <table width="500px" align="center" style="background-color: skyblue" cellspacing="0" cellpadding="8px">
            <caption><h2>用户注册</h2></caption>
            <tr>
                <td colspan="2">
                    <hr />
                </td>
            </tr>
            <tr>
                <td align="right"><label for="num">帐号:</label></td>
                <td><input type="text" name="num" id="num" /></td>
            </tr>
            <tr>
                <td align="right"><label for="password">密码:</label></td>
                <td><input type="password" name="password" id="password" /></td>
            </tr>
            <tr>
                <td align="right">性别:</td>
                <td>
                    <input type="radio" name="sex" id="" value="男" />男
                    <input type="radio" name="sex" id="" value="女" />女
                    <input type="radio" name="sex" id="" value="保密" />保密
                </td>
            </tr>
            <tr>
                <td align="right">爱好:</td>
                <td>
                    <input type="checkbox" name="hobby[]" id="" name="game" />打游戏
                    <input type="checkbox" name="hobby[]" id="" name="wash" />洗
                    <input type="checkbox" name="hobby[]" id="" name="篮球" />篮球
                    <input type="checkbox" name="hobby[]" id="" name="足球" />足球
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <hr />
                </td>
            </tr>
            <tr>
                <td colspan="2">
                    <input type="submit" value="提交" style="margin-left: 100px;border-radius: 8px;cursor:pointer" />
                    <input type="reset" value="重置" style="margin-left: 100px;border-radius: 8px;cursor:pointer" />
                </td>
            </tr>
        </table>
    </form>

    </body>
</html>

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3种单位的区别


实例

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
    </head>
    <title>3种单位的区别</title>
    <body>
    <div class="px">px</div>
    <div class="em">em</div>
    <div class="rem">rem</div>
    <style>
        /*
            浏览器默认字体16px
            最小12px
         */
        .px{
            font-size:20px;
            width:100px;
            line-height:100px;
            text-align:center;
            background-color:#666666;
        }
        .em{    /*em =16px 默认值*/
            font-size:20px;
            width:5em;
            line-height:5em;
            text-align:center;
            background-color:red;
        }
        .rem{
            width:10rem;
            line-height:10rem;
            text-align:center;
            background-color:blue;
        }
    </style>
    </body>
</html>

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样式继承:


实例

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
    </head>
    <title>样式继承</title>
    <body>
    <style>
        /*在文档中 字体、颜色、字体大小、列表样式、表格可继承*/
        /*元素外部的属性 边框 内外边距不可继承*/

        body{
            font-size:22px;   /*可继承*/
        }
        ul{
            font-weight:bold;   /*可继承*/
            border:1px solid red;  /*不可继承*/
            padding:1rem;     /*不可继承*/
        }
        ul li{
            border:inherit;   /*强制继承*/
            padding:inherit;  /*强制继承*/
        }
    </style>


    <nav>
        <ul>
            <li class="item1"><a href="">导航1</a></li>
            <li class="item2"><a href="">导航2</a></li>
            <li class="item3"><a href="">导航3</a></li>
            <li class="item4"><a href="">导航4</a></li>
        </ul>
    </nav>

    </body>
</html>

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CSS选择器:


实例

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
    </head>
    <title>样式冲突</title>
    <body>
    <!--
        样式优先级
        内联:style属性声明在元素内部,仅对当前元素有效
        内部:style标签,对当前文件有效
        外部:通过link引入css样式
        优先级:内联>内部>外部
        同名样式后面定义的会覆盖前面的
        强制优先级:!import

     -->
    <style>
        h2{
            /*color:blue;*/
        }
    </style>
    <h2 style="color: red">hello  world</h2>

    <style>
        ul{
            margin:0;
            padding:20px 5px;
            width:600px;
            border:1px dashed #666;
        }
        /*子块撑开父级*/
        ul:after{
            content:'';
            display:block;
            clear:both;
        }
        ul li{
            list-style:none;
            float:left;
            width:40px;
            height:40px;
            line-height:40px;
            border-radius:50%;
            background-color:skyblue;
            text-align:center;
            margin:0 5px;
            box-shadow:3px 3px 3px #666666;
        }
        /*属性选择器*/
        ul li[id]{
            background-color:red;
        }
        ul li[class]{
            background-color:green;
        }
        ul li[class="item2"]{
            background-color:yellow;
        }
        /*以***开头*/
        ul li[class^="cat"]{
            background-color:blue;
        }
        /*以***结尾*/
        ul li[class$="big"]{
            background-color:#f24f24;
        }
        /*属性值中包含**的*/
        ul li[class*="t"]{
            background-color:#f56f56;
        }
        /*层级选择器*/
        body ul li{
            border:1px solid #000;
        }
        /*子选择器*/
        ul>li[class="item2"]{
            background-color:cyan;
        }
        /*相邻选择器*/
        ul li[class$="big"] ~ *{
            background-color:black;
            color:#fff;
        }
        /*相邻兄弟选择器*/
        ul li[class$="big"]+li{
            background-color:pink;
        }
        /*群组选择器*/
        h2,p{
            font-size:33px;
            font-weight:bold;
        }
        /*伪类*/
        a{
            font-size:22px;
        }
        /*访问后*/
        a:link{
            color:blue;
        }
        /*访问前*/
        a:visited{
            color:red;
        }
        /*获取焦点*/
        a:focus{
            color:pink;
        }
        /*鼠标悬停*/
        a:hover{
            color:#000;
        }
        /*鼠标点击激活的时候*/
        a:active {
            color: aquamarine;
        }
        /*伪类选择器  位置*/
        ul li:first-child{  /*第一个*/
            background-color:#fff !important;
        }
        ul li:last-child{   /*倒数第一个*/
            color:red;
        }
        ul li:nth-child(5){     /*第五个*/
            background-color:skyblue;
        }
        ul li:nth-child(even){
            /*偶数、odd基数*/
            background-color:#f4f4f4;
        }
        /*伪类选择器: 根据子元素的数量*/
        ol :only-child {
            background-color: lawngreen;
        }

        ol li:only-child {
            background-color: lawngreen;
        }

        ul li:nth-last-child(3) {
            background-color: wheat;
        }
        /*规定属于其父元素的第二个 p 元素*/
        ol li:nth-of-type(2) {
            background-color: wheat;
        }
        /*空元素*/
        :empty{
            width:220px;
            height:220px;
            background-color:cyan;
        }

        :empty:after{
            content:'hello world';  /*内容*/
        }

        :empty:before {
            /*通过伪类添加的元素,默认都是行内元素,不支持宽高设置,可以通过设置背景图片的方式来间接处理*/
            content: url("./static/images/footlogo.png");
        }

    </style>

    <ul>
        <li id="item1">1</li>
        <li class="item2">2</li>
        <li class="cat dog big">3</li>
        <li >4</li>
        <li>5</li>
        <li>6</li>
        <li>7</li>
        <li>8</li>
        <li>9</li>
        <li>10</li>
    </ul>

    <h2>hello</h2>
    <p>你好吗</p>
    <a href="http://www.php.cn/">PHP中文网</a>

    <div></div>
    <ol>
        <li>1</li>
    </ol>

    <ol>
        <li>1</li>
        <li>2</li>
        <li>3</li>
    </ol>

    <ol>
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
    </ol>


    </body>
</html>

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IMG_20180816_090914.jpg

Correction status:qualified

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