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为什么display：inline-block水平的下拉菜单会先上升后下降

0

1

布局

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

 <style>
        ul {
            display: inline-block;
            background: red;
            margin: 0;
            max-height: 0;
            overflow: hidden;
            transition: all 5s;
        }

        div {
            background: black;
            color: #fff;
        }
    </style>
</head>

<body>
    <button>点击触发</button>
    <div class="drop-contaienr">
        <ul>
            <li>下拉列表选项</li>
            <li>下拉列表选项</li>
            <li>下拉列表选项</li>
            <li>下拉列表选项</li>
        </ul>
    </div>
    <script>
        var log = console.log;
        var btn = document.querySelector('button'),
            ul = document.querySelector('ul');
        btn.onclick = function () {

            ul.style['max-height'] = '300px';
        }
    </script>

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本地完成任务上传到GitHub后，bootstrap轮播图显示异常

0

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 图片

class="cursor-pointer"> 文本

该问题已被官方收录

设置了宽高的小盒子，在加入“首页”文字之后，原有的高度就塌陷了

1

1

浮动

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1" />
   <title>Title</title>
   <style>
       * {
                      margin: 0;
           padding: 0;
       }
       .foot{
                      position:fixed;
           bottom:0;
           width:100%;
           height:4rem;
           background-color:#fff;
           box-sizing:border-box;;
           padding:0.3rem;
           text-align:center;
       }
       .house,
       .write,
       .man {
                      display:inline-block;
           background-image: url("形状4.png");
           background-repeat:no-repeat;
       }
       .house,
       .man {
                      width:2rem;
           height:3rem;
           background-size:8rem;
       }
       .house {
                      background-position:left top;
       }
       .write {
                      width:4rem;
           height:3.5rem;
           background-size:7rem;
           background-position:4px bottom;
       }
       .man {
                      background-position:-50px top;
       }
       .house div {
                      display: inline-block;
           font-size:1rem;
       }
   </style>
</head>
<body>
<div "foot">
   <div "house">
       <div>首页</div>
   </div>
   <div "write">
   </div>
   <div "man">
   </div>
</div>
</body>
</html>

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flex在ul中对list-style的一个奇怪现象

0

1

属性

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<ul class="ul-left">
             <li class="li-left"><a class="list-a" href="">阿里巴巴</a></li>
              <li class="li-left"><a class="list-a" href="">腾讯视频</a></li>
             <li class="li-left ing"><a class="list-a ing" href="">土豆网</a></li>
</ul>




这里是CSS
.ul-left {
display:flex;
flex-diretion:colunm;
justify-content:center;
align-item:center;
...
}

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gulp4.0任务会报错

0

1

打包工具

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

1

该问题已被官方收录

link引入和@import引入的性能区别

0

1

Sass

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

@charset "utf-8";  
  
/* 重置样式 */  
button { padding: 0; border: none; background: transparent; outline: none;}    //按钮默认样式修改
a {text-decoration:none;outline:none;}
p {margin: 0;}
ul {margin: 0; padding: 0;outline: none;list-style: none;}
.flt-right {float: right;}
/* 基础样式 */   
$col-1 :#f0f0f0;    //灰色背景颜色
$col-2 :#29bde0;    //页面调性主颜色
$col-3 :#fbb435;    //页面调性次颜色
::-webkit-scrollbar {display: none;}    //隐藏滚动条
img { transform: scale(0.5);}    //插入图片统一缩放:0.5

/* 全局样式 */  
html {
  font-size: 625%;
  overflow-x: hidden; 
}

body {
  font-size: .12rem;
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
}

@charset "UTF-8";
/* 重置样式 */
button {
  padding: 0;
  border: none;
  background: transparent;
  outline: none; }

a {
  text-decoration: none;
  outline: none; }

p {
  margin: 0; }

ul {
  margin: 0;
  padding: 0;
  outline: none;
  list-style: none; }

.flt-right {
  float: right; }

/* 基础样式 */
::-webkit-scrollbar {
  display: none; }

img {
  transform: scale(0.5); }

/* 全局样式 */
html {
  font-size: 625%;
  overflow-x: hidden; }

body {
  font-size: .12rem;
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden; }

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给小箭头设置旋转后，小箭头浮动在上面的fixed定位的上面

1

1

定位

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

 .arrows {
  width: .2rem;
  height: .2rem;
  border-top: 2px solid #5fc0cd;
  border-right: 2px solid #5fc0cd;
  transform: rotate(45deg);
}

该问题已被官方收录

轮播图为什么不自动翻页？

0

1

轮播

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<link rel="stylesheet" href="../css/task8.css">
<script src="http://how2j.cn/study/js/jquery/2.0.0/jquery.min.js"></script>
<link href="http://how2j.cn/study/css/bootstrap/3.3.6/bootstrap.min.css" rel="stylesheet">
<script src="http://how2j.cn/study/js/bootstrap/3.3.6/bootstrap.min.js"></script>
<div class="wrap">
        <div class="container">
            <div class="header-main">
               <span>客服热线：010-594-78634</span>
                <div class="vx">
                <img src="../img/task8...png"  alt="">
                <img src="../img/task.8..png" alt="">
                <img src="../img/task.81.png"  alt="">
                </div>
            </div>
        </div>
    <div class="navigation">
        <div class="option">
            <p>首页</p>
            <p>职业</p>
            <p>推荐</p>
            <p>关于</p>
        </div>
    </div>
    <div id="myCarousel" class="carousel slide">
        <!-- 轮播（Carousel）指标 -->
        <ol class="carousel-indicators">
            <li data-target="#myCarousel" data-slide-to="0" class="active"></li>
            <li data-target="#myCarousel" data-slide-to="1"></li>
            <li data-target="#myCarousel" data-slide-to="2"></li>
        </ol>
        <!-- 轮播（Carousel）项目 -->
        <div class="carousel-inner">
            <div class="item active">
                <img src="../img/task888png.png" alt="Third slide">
            </div>
            <div class="item">
                <img src="../img/task888png.png" alt="Third slide">
            </div>
            <div class="item">
                <img src="../img/task888png.png" alt="Third slide">
            </div>
        </div>
        <!-- 轮播（Carousel）导航 -->
        <a class="left carousel-control" href="#myCarousel" role="button" data-slide="prev">
            <span class="glyphicon glyphicon-chevron-left" aria-hidden="true"></span>
            <span class="sr-only">Previous</span>
        </a>
        <a class="right carousel-control" href="#myCarousel" role="button" data-slide="next">
            <span class="glyphicon glyphicon-chevron-right" aria-hidden="true"></span>
            <span class="sr-only">Next</span>
        </a>
    </div>
</div>
</body>
</html>

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怎么给hover添加动画效果

2

1

hover

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

.list-3:hover .list-4{
    opacity: 1;
}

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如何让滚动条只在中间主题部分，不让滚动条出现在页眉和页脚部分？

1

1

布局

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

.header {
    position: fixed;
    top: 0px;
    z-index: 10;
    width: 100%;
    height: 14rem;
    background-color: #f8fafb;
}

 <div style="height:14rem;"></div>

<div class="row main-body">

去第页

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