• 属性选择器



    .local-nav li [class^="local-nav-icon"] {
         32px;
        height: 32px;
        margin-top: 8px;
    }

    .local-nav li [class$="icon1"] {
        background: url(../images/localnav_bg.png) no-repeat 0 0;
        background-size: 32px auto;
    }

     

    <!DOCTYPE html>
    <html lang="en">

    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
        <style>
            /* 第一个 */
            /* ul li:first-child {
                pink;
            }

            /* 最后一个 */
            /* ul li:last-child {
                deeppink;
            }  */
            /* nth-child(n) 要第几个 n 就是是几 */
            /* ul li:nth-child(8) {
                lightpink;
            } */
            /* even  选择的全部偶数  */
            /* ul li:nth-child(even) {
                pink;
            } */
            /* odd  选择的全部奇数  */
            /* ul li:nth-child(odd) {
                hotpink;
            } */
            /* n 是公式 但是 n 从0 开始计算 */
            /* ul li:nth-child(n) {
                pink;
            } */
            /* 2n 是偶数 */
            /* ul li:nth-child(2n) {
                pink;
            } */
            /* 2n+1 是奇数 */
            /* ul li:nth-child(2n + 1) {
                skyblue;
            } */
            /* 5n 选择第 0  5  15 20 ...    5 的倍数*/
            /* ul li:nth-child(4n) {
                purple;
            } */
            /* n+5 就是从第5个开始往后面选择 包含第5个*/
            /* ul li:nth-child(n+5) {
                pink;
            } */
            /* -n+5 就是从第5个开始往前面选择 包含第5个*/
            
            ul li:nth-child(-n+5) {
                background-color: pink;
            }
        </style>
    </head>

    <body>
        <ul>
            <li>1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
            <li>5</li>
            <li>6</li>
            <li>7</li>
            <li>8</li>
            <li>9</li>
            <li>10</li>
            <li>11</li>
            <li>12</li>
            <li>13</li>
            <li>14</li>
            <li>15</li>
            <li>16</li>
            <li>17</li>
            <li>18</li>
            <li>19</li>
            <li>20</li>
            <li>21</li>
            <li>22</li>
            <li>23</li>
            <li>24</li>
            <li>25</li>
            <li>26</li>
            <li>27</li>
            <li>28</li>
            <li>29</li>
            <li>30</li>
            <li>31</li>
            <li>32</li>
            <li>33</li>
            <li>34</li>
            <li>35</li>
            <li>36</li>
            <li>37</li>
            <li>38</li>
            <li>39</li>
            <li>40</li>
            <li>41</li>
            <li>42</li>
            <li>43</li>
            <li>44</li>
            <li>45</li>
            <li>46</li>
            <li>47</li>
            <li>48</li>
            <li>49</li>
            <li>50</li>
        </ul>
    </body>

    </html>
     
     
    <!DOCTYPE html>
    <html lang="en">

    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>nth-of-child</title>
        <style>
            /* div :nth-child(1) {
                pink;
            }
            
            div :nth-child(2) {
                purple;
            } */
            /* of-type 选择指定类型的元素 */
            
            div span:first-of-type {
                background-color: purple;
            }
            
            div span:nth-of-type(2) {
                background-color: red;
            }
            
            div span:last-of-type {
                background-color: skyblue;
            }
        </style>
    </head>

    <body>
        <div>
            <p>我是一个p</p>
            <span>我是span</span>
            <span>我是span</span>
            <span>我是span</span>
            <span>我是span</span>
        </div>
    </body>

    </html>
  • 相关阅读:
    前台提交数据到后台还回错误提示并且把新增页面关掉的问题
    combox二级联动带不出来问题
    数据库设计字段如果首字母是大写
    带图片的修改后台出现的问题
    weblogic启动报错
    强制删除文件夹
    jQuery常用方法
    json数据的转换
    SQL DEFAULT 约束
    SQL CHECK 约束
  • 原文地址:https://www.cnblogs.com/ericblog1992/p/12932686.html
Copyright © 2020-2023  润新知