Day79向JavaScript进阶的第四天

迷南。 2023-03-02 10:49 50阅读 0赞

## 隔行变色 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70]

## 全选反选 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 2]

## tab栏切换 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 4]

## H5获取属性的方法 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 5]

## 父节点 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 6]

## 子节点的获取 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 7]

## 子节点第一个子元素和最后一个子元素 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 8]

## 新浪下拉菜单 ##

<!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> * { 
                margin: 0;
                padding: 0;
            }
    
            .nav { 
                display: block;
                height: 200px;
                width: 300px;
                margin: 200px auto;
                /* background-color: red; */
            }
    
            .nav li { 
                width: 60px;
                float: left;
                /* background-color: rgb(233, 156, 156); */
                list-style: none;
            }
    
            .nav a { 
                display: inline-block;
                width: 60px;
                height: 50px;
                text-decoration: none;
                line-height: 50px;
                text-align: center;
            }
    
            .body a { 
                border: 1px solid #cccccc;
                border-top: none;
            }
    
            .nav ul { 
                display: none;
            }
        </style>
    </head>
    
    <body>
        <ul class="nav">
            <li>
                <a href="">微博</a>
                <ul class="body">
                    <li><a href="#">私信</a></li>
                    <li><a href="#">评论</a></li>
                    <li><a href="#">@我</a></li>
                </ul>
    
            </li>
            <li>
                <a href="">微博</a>
                <ul class="body">
                    <li><a href="#">私信</a></li>
                    <li><a href="#">评论</a></li>
                    <li><a href="#">@我</a></li>
                </ul>
    
            </li>
            <li>
                <a href="">微博</a>
                <ul class="body">
                    <li><a href="#">私信</a></li>
                    <li><a href="#">评论</a></li>
                    <li><a href="#">@我</a></li>
                </ul>
    
            </li>
            <li>
                <a href="">微博</a>
                <ul class="body">
                    <li><a href="#">私信</a></li>
                    <li><a href="#">评论</a></li>
                    <li><a href="#">@我</a></li>
                </ul>
    
            </li>
            <li>
                <a href="">微博</a>
                <ul class="body">
                    <li><a href="#">私信</a></li>
                    <li><a href="#">评论</a></li>
                    <li><a href="#">@我</a></li>
                </ul>
    
            </li>
    
        </ul>
        <script>
            //获取元素
            var nav = document.querySelector('.nav');
            var lis = nav.children; //得到五个小li
            for (var i = 0; i < lis.length; i++) { 
                lis[i].onmouseover = function () { 
                    this.children[1].style.display = 'block';
                }
                lis[i].onmouseout = function () { 
                    this.children[1].style.display = 'none';
                }
            }
        </script>
    </body>
    
    </html>

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 9]

## 兄弟节点 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 10]

## 创建和添加节点 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 11]  
![在这里插入图片描述][20200729105459615.png]  
创建和添加和删除节点—案例

<!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>
            * { 
                padding: 0;
                margin: 0;
            }
    
            .head { 
                width: 500px;
                margin: 200px auto;
            }
    
            textarea { 
                height: 100px;
                width: 200px;
                padding-top: 10px;
                padding-left: 10px;
                font-size: 14px;
            }
    
            ul { 
                width: 280px;
            }
        </style>
    </head>
    
    <body>
        <div class="head">
            <textarea name="" id=""></textarea>
            <button class="submit">提交</button>
            <button class="delete">删除</button>
            <ul></ul>
    
        </div>
        <script>
            var sub = document.querySelector('.submit');
            var del = document.querySelector('.delete');
            var text = document.querySelector('textarea');
    
            var ul = document.querySelector('ul');
            sub.onclick = function () { 
                if (text.value == '') { 
                    alert('您输入的内容不能为空！')
                    return false;
                } else { 
                    var lili = document.createElement('li');
                    lili.innerHTML = (text.value) + "<a href='javascript:;' style='float:right'>删除</a>";
                    ul.appendChild(lili);
                    // 删除元素
                    var as = document.querySelectorAll('a');
                    for (var i = 0; i < as.length; i++) { 
                        as[i].onclick = function () { 
                            ul.removeChild(this.parentNode);
                        }
                    }
                }
            }
            del.onclick = function () { 
                if (ul.children.length == 0) { 
                    alert('删除失败，您的留言板为空');
                    return false;
                } else { 
                    ul.removeChild(ul.children[0]);
                }
            }
        </script>
    </body>
    
    </html>

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 12]

## 克隆节点 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 13]

## 动态生成表格案例 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 14]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 15]

## 三种元素创建的方式 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 16]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 17]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 18]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 19]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 20]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 21]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 22]

## 移除事件的两种方式 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 23]

## DOM事件流 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 24]

## 事件对象 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 25]

## 常见的事件的对象属性和方法 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 26]

## 得到事件类型 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 27]

## 阻止默认行为事件 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 28]

## 阻止冒泡 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 29]  
事件委托原理（面试经常问到）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 30]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 31]

## 鼠标事件 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 32]

## 禁用右键，禁用选中文字 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 33]

## 鼠标事件对象 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 34]

## 图片跟随鼠标移动—案例 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 35]  
![在这里插入图片描述][2020072922474376.png]

## 常用的鼠标事件 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 36]

## 利用keycode可以获得ASCII值 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 37]

## 京东案例—鼠标按S键跳到搜索框 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L21tbW1tbW1tbW16_size_16_color_FFFFFF_t_70 38]

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[20200729105459615.png]: /images/20230208/8a52773beb334c1f99c7c7a9aab6115e.png
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Day79向JavaScript进阶的第四天

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