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IT修真院·坑乎 | Java(后端),CSS(前端),JavaScript(前端),PM(产品经理),UI(交互设计),QA(测试),Android(安卓APP),iOS(苹果APP),OP(运维),Python(后端)日常在线问答学习平台

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占位符和混合器继承的差别是什么

2

1

sass

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 图片

class="cursor-pointer"> 文本

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某些属性不能用样式表控制，只能写在标签里

0

1

表单元素

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

div class="input">
        <img src="../img/css4/css401.jpg">
        <input type="text" placeholder="请输入用户名"  maxlength="11"  onkeyup="value=value.replace(/[^\d]/g,'')">
    </div>
    <div class="input">
        <img src="../img/css4/css402.jpg">
        <input type="password" placeholder="请输入密码" >
    </div>

 <audio class="audio" src="../audio/css7.mp3" controls="controls">
        您的浏览器不支持音频
    </audio>

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css有没有办法点击单选按钮使前面的某个元素变色。

0

1

通用

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<nav class="nav">
        <input type="checkbox" id="nav-toggle" class="nav-toggle">
        <label for="nav-toggle">
            <svg xmlns="http://www.w3.org/2000/svg" width="23" height="22">
                <defs>
                    <filter id="shadow">
                        <feDropShadow dx="0" dy="0" stdDeviation="1.6">
                    </filter>
                </defs>
                <polygon points="1,1 22,10 1,20 1,1" fill="#1d7ad9" filter="url(#shadow)"></polygon>
            </svg>
        </label>
        <ul class="nav-list">
            <li>
                <a href="#">首页</a>
            </li>
            <li>
                <a href="#">在线定制</a>
            </li>
            <li>
                <a href="#">标准箱</a>
            </li>
            <li>
                <a href="#">品质保障</a>
            </li>
        </ul>
    </nav>
    <main class="main">
        <div class="step-box">
            <div class="step">
                <div class="circle" id="box-circle">1</div>
                <div class="line" id="box-line"></div>
                <p id="step-one">1.定制纸箱</p>
            </div>
            <div class="step">
                <div class="circle" id="size-circle">2</div>
                <div class="line" id="size-line"></div>
                <p id="step-two">2.选择数量</p>
            </div>
            <div class="step">
                <div class="circle" id="material-circle">3</div>
                <div class="line" id="material-line"></div>
                <p id="step-three">3.上传附件</p>
            </div>
            <div class="step">
                <div class="circle">4</div>
                <div class="line"></div>
                <p>4.确认下单</p>
            </div>
        </div>

.nav{
    display: block;
    padding-top: 20px;
    padding-bottom: 20px;
    padding-right: 15%;
    background-color: #f9f9f9;
}
.nav-list{
    float: right;
    list-style: none;
}
.nav-list li{
    display: inline-block;
    margin-left: 30px;
}
/* .nav-list li a:focus,
.nav-list li a:hover{
    color: #fff;
    background-color: #1d7ad9;
} */
.nav-list li a{
    display: inline-block;
    height: 45px;
    padding-left: 15px;
    padding-right: 15px;
    line-height: 45px;
    text-decoration: none;
    background-color: #fff;
    border-radius: 8px;
    color: #333;
    box-shadow: 0 0 5px 1px #ccc;
}
.nav input:checked~.nav-list{
    display: block;
}
.nav input:checked~label svg{
    transform: rotateZ(90deg);
    transition: width 2s;
}
.nav label{
    display: none;
}
.nav .nav-toggle{
    display: none;
}
.main{
    padding-left: 15%;
    padding-right: 15%;
}
.step-box{
    display: flex;
    justify-content: flex-end;
    text-align: center;
}
 .step:hover div{
    background-color: #ff7f02;
}
.step:hover p{
    color: #ff7f02;
}
.step-box p{
    padding-top: 20px;
}
.line{
    height: 3px;
    width: 10vw;
    border-radius: 2px;
    background-color: #cccccc;
    min-width: 71px;
}
.circle{
    width: 22px;
    height: 22px;
    line-height: 22px;
    border-radius: 50%;
    background-color: #cccccc;
    text-align: center;
    z-index: 1;
    color: #fff;
    position: relative;
    top: 13px;
    left: 50%;
    transform: translateX(-50%);
}
.message{
    line-height: 40px;
    font-weight: bold;
    font-size: 1.8rem;
}
.message span::before{
    content: "";
    display: inline-block;
    vertical-align: text-top;
    margin-right: 5px;
    height: 1.9rem;
    width: 3px;
    border-radius: 2px;
    background-color: #1d7ad9;
}
.choose{
    position: relative;
    padding-left:35px;
    height: 40px;
    line-height: 40px;
    font-weight: bold;
    color: #1d7ad9;
    background-color: #f3f3f3;
    border-left: 1px solid #e8e8e8;
    border-right: 1px solid #e8e8e8;
}
.choose .word-box::before{
    content: "";
    display: inline-block;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 10px;
    width: 15px;
    height: 13px;
    background-image: url(images/box.png);
    background-repeat: no-repeat;
    background-size: contain;
}
.choose .word-size::before{
    content: "";
    display: inline-block;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 10px;
    width: 15px;
    height: 13px;
    background-image: url(images/size.png);
    background-repeat: no-repeat;
    background-size: contain;
}
.choose .word-material::before{
    content: "";
    display: inline-block;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 10px;
    width: 15px;
    height: 13px;
    background-image: url(images/scissors.png);
    background-repeat: no-repeat;
    background-size: contain;
}
.choose-box{
    position: relative;
    padding-top: 30px;
    padding-bottom: 30px;
    background-color: #fbfcff;
    border-left: 1px solid #e8e8e8;
    border-right: 1px solid #e8e8e8;
    border-bottom: 1px solid #e8e8e8;
    z-index: 2;
}
.box-one,.box-two,.box-three{
    display: inline-block;
    margin-left: 30px;
}
.choose-material>div:nth-child(-n+5){
    display: inline-block;
    margin-left: 30px;
}
.choose-size{
    position: relative;
    padding-top: 30px;
    background-color: #fbfcff;
    border: 1px solid #e8e8e8;
    z-index: 1;
}
.size-box{
    display: flex; 
    padding-bottom: 30px;
}
.text-box{
    margin-left: 30px;
}
.choose-material{
    position: relative;
    padding-top: 30px;
    padding-bottom: 30px;
    background-color: #fbfcff;
    border: 1px solid #e8e8e8;
    z-index: 1;
}
input[type="text"]{
    padding: 0;
    height: 18px;
    outline: none;
    border: none;
    border: 1px solid #ccc;
}
.size-one,.size-two{
    margin-left: 30px;
}
label{
    font-weight: normal;
}
input[type="radio"] + .choice::before {
    content: "\a0"; /*不换行空格*/
    display: inline-block;
    vertical-align: middle;
    width: 17px;
    height: 17px;
    margin-right: 12px;
    vertical-align: text-top;
    border-radius: 50%;
    border: 1px solid #d6d6d6;
    background-color: #f8f9fb;
}
input[type="radio"]:checked + .choice::before {
    background-image: url(images/circle.png);
    background-size: contain;
    background-repeat: no-repeat;
    border: none;
}
input[type="radio"] {
    position: absolute;
    clip: rect(0, 0, 0, 0);
}
/* div+js模拟下拉框 */
.select-box{
    position: absolute;
    top: 50%;
    right: 10px;
    transform: translateY(-50%); 
    background: #fff;
}

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rgba和opacity有什么区别

1

1

透明度

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

 position: fixed;
    right: -25.5rem;
    opacity: 0;

height: 6.45rem;
    width: 100%;
    position: fixed;
    bottom: 0;
    z-index: 1;
    background:rgba(153,223,240,.4);
    padding: 1.2rem 0.9rem 0.95rem 0rem;
    text-align: center;

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子绝父相为什么子元素会占满父元素

4

1

定位定宽

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<!DOCTYPE html>
<html>
<head>
	<title>zijuefuxiang</title>
	<meta charset="utf-8">
	<meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
	<style type="text/css">
		html {
			font-size: 625%;
		}
		body {
			background-color: gray;
		}
		
		.A {
			width: 50%;
			height: 2rem;
			background-color: orange;
			box-sizing: border-box;
			border: 1px solid #333;
			position: relative;
			margin-top: 1rem;
		}
		.B {
			background-color: blue;
			font-size: .32rem;
			color: white;
			position: absolute;
			top: 0;
			right: 0;
			bottom: 0;
			left: 0;
		}
	</style>
</head>
<body>
	<div class="A">
		<div class="B">哈哈哈哈</div>
	</div>

</body>
</html>

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使用了bootstrap之后不知道怎么调整外边距的问题。

0

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

    <div class="container facetofuture">
        <img  class="datemate" src="../images/dataMap.png"/>

            <div class="col-xs-12 col-lg-6 box ">
                <div><img src="../images/study.jpg" /></div>
                <p class="facetofuture-title">编程王为孩子将来打基础</p>
                <p class="facetofuture-contai">在思考分析问题和完成程序的过程中去培养编程思维，是培养孩子细心和专注的最佳工具。在组队完成创作作品的过程中，提升孩子的团队协作能力。编程将逐渐纳入基础教育，提前学习编程，为留学升学加码</p>
            </div>
            <div class="col-xs-12 col-lg-6 box">
                <div><img src="../images/school.jpg"/></div>
                <p class="facetofuture-title">特招或考入名校</p>
                <p class="facetofuture-contai">2018年1月，教育部颁发的《新课程标准》指出：信息技术将从兴趣课程变为必修课程，并大幅度提升了学生在编程、计算思维、算法方面的思维要求，给予学生更大的发展选择空间（浙江省已明确要求）</p>
            </div>
    </div>

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组件库改如何引用？

0

1

组件库

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

axios({
  method: 'get',
  url: '/static/style/cart.json',
  data: {
 
  }
 })
<script type="text/javascript" src="static/style/vue.min.js"></script>
<script type="text/javascript" src="static/style/vue-resource.min.js"></script>
<script type="text/javascript" src="static/style/cart.js"></script>
cartView:function(){
 var _this=this //记得写在get上面，不然取不到值
 this.$http.get('/static/style/cart.json',{'id':123}).then(function(res){
 this.pro=res.body.name;
 //_this.produceList=res.body.result.list;
 console.log(res.body.name)
 })
}

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页面打不开，在浏览器中打开页面出现找不到文件提示。

0

1

路径

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<!DOCTYPE html>
<html>
<head>
    <title>setup</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link type="text/css" rel="stylesheet"  href="setup.css">
    <script src="setup.js"></script>
</head>
<body>
<header><img src="./img/9.png"><span>参考设置</span><img class="iconright" src="./img/10.png"></header>
<div class="main">
    <div class="match">
        <div class="match_left">玩家配比</div>
        <div class="match_right">
            <div></div>
            <button>点击设置</button>
        </div>
    </div>
    <div class="keyword">
        <input type="text" maxlength="8" placeholder="水民词组">
        <input type="text" maxlength="8" placeholder="卧底词组">
    </div>
    <div class="playernum">
        <div class="number">玩家人数<input id="shownum" type="number" min="4" max="18" maxlength="2">人</div>
        <div class="slide">
            <input id="subbtn" onclick="subnum()" type="button" value="—">
            <input id="range" oninput="change()" type="range" min="4" max="18" step:"1" value="4">
            <input id="addbtn" onclick="addnum()" type="button" value="+" style="font-size:1.2rem">
        </div>
        
    </div>
    <button class="deal">去发牌</button>
</div>
</body>  
</html>

$grey:#f0f0f0;
$lightgrey:#fbfbfb;
$deepgrey:#d9d9d9;
$white:#fff;
$blue:#29bde0;
$orange:#fab344;
$lightorange:#ffe6be;
@mixin mmwidth(){
    min-width: 320px;
    max-width: 768px;
}
@mixin mtb($mtop,$mbtm){
    margin-top:$mtop;
    margin-bottom:$mbtm;
}
@mixin ptb($ptop,$pbtm){
    padding-top: $ptop;
    padding-bottom:$pbtm;
}
@mixin fixedmg(){
    margin-left:.5rem;
    margin-right:.5rem;
}
@mixin fixedpd(){
    padding-left:.5rem;
    padding-right:.5rem;
}
@mixin size($width,$height){
    width:$width;
    height:$height;
}
body{
    @include mmwidth;
    margin:0 auto;   
}
header{
    @include mmwidth;
    @include ptb(.5rem,.5rem);
    @include fixedpd;
    display: flex;
    justify-content: space-between;
    font-size: 1rem;
    color:$white;
    background-color: $blue;
    img{
        height:1.2rem;
    }
    .iconright{
        width:1.2rem;
    }
}
.main{
    @include mmwidth;
    padding:.5rem;
    background-color: $grey;
    .match{
        display:flex;
        .match_left{
            width:1.2rem;
            padding:0 1rem;
            border-right:1px solid $deepgrey;
            font-size: 1.2rem;
            background-color: $white;
        }
        .match_right{
            background-color: $lightgrey;
        }
    }
    .keyword{
        @include mtb(.5rem,.5rem);
        padding:0.5rem 2rem 1.2rem;
        background-color: $white;
        input{
            @include ptb(.6rem,.6rem);
            display: block;
            width:100%;
            border:none;
            border-bottom:1px solid $deepgrey;
            font-size: .8rem;
            color:$lightgrey;

        }
    }
    .playernum{
        margin-bottom: .5rem;
        padding:1rem 1rem;
        background-color: $white;
        .number{
            margin-bottom: 1rem;
            input{
                @include size(1.6rem,1.3rem);
                margin:0 1rem;
                border:none;
                font-size: 1rem;
                text-align:center;
                background-color: $grey;
                outline: none;      
                &:focus{
                    outline:none;
                }
            }
        }
        .slide{
            display: flex;
            justify-content: space-between;

            input[type=button]{
                margin: 0 2rem;
                border:1px solid $deepgrey;
                font-size: 0.7rem;
                font-weight: bold;
                color:$orange;
                background-color: $white;
                outline: none;
            }
            input[type=range] {
                -webkit-appearance: none;
                width: 100%;
                background: -webkit-linear-gradient(left,$orange,$lightorange) no-repeat;
            }
            input[type=range]::-webkit-slider-thumb {
                -webkit-appearance: none;
            }    
            input[type=range]{
                flex:1;
                outline: none;
            }
            input[type=range]::-webkit-slider-runnable-track{
                -webkit-appearance:none;
                height:0.3rem;
                background-color: $lightorange;
            }
            //input[type=range]::-webkit-slider-thumb {
            //    -webkit-appearance: none;
            //    height: 25px;
            //    width: 25px;
            //    margin-top: -5px; /*使滑块超出轨道部分的偏移量相等*/
            //    background: red; 
            //    border-radius: 50%; /*外观设置为圆形*/
            //    border: solid 0.125em rgba(205, 224, 230, 0.5); /*设置边框*/
            //    box-shadow: 0 .125em .125em #3b4547; /*添加底部阴影*/
            //}
            input[type=range]::-webkit-slider-thumb{
                -webkit-appearance:none;
                width:2rem;
                height:1.5rem;
               background:url("./img/11.png") no-repeat;
               background-size: 2rem 1.5rem;
               margin-top: -0.6rem;
            }
        }

    }

    input::-webkit-outer-spin-button,input::-webkit-inner-spin-button{
        -webkit-appearance: none;
    }
    input[type=number]{
        -moz-appearance: textfield;       
    } 
    .deal{
        @include size(100%,3rem);
        font-size: 1.2rem;
        border: none;
        outline: none;
        color:$white;
        background-color: $orange;
    }
}

var num=document.getElementById("range");
 var location=document.getElementById("shownum");
function addnum(){
num.value=++num.value;
    change();
}
function subnum(){
num.value=num.value-1;
    change();
}
function change(){
 location.value=num.value;
}

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如何不用框架做响应式导航栏

0

1

导航栏响应式

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

css

该问题已被官方收录

侧边导航栏出现时，不会紧贴着屏幕左边

1

1

侧边栏

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

@charset "UTF-8";
.cen-cen {
  display: flex;
  align-items: center;
  justify-content: center; }

.fixed-t {
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
  z-index: 10; }

.relative {
  position: relative; }

.absolute {
  position: absolute; }

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

.a {
  width: 1rem; }

* {
  margin: 0;
  padding: 0; }

html {
  font-size: 62.5%; }

.main {
  padding: 4rem 8%;
  background-color: #F0F0F0; }

/*
    页头
*/
.header {
  height: 3rem;
  background-color: #29bde0; }

.la {
  display: inline-block;
  width: 3rem;
  height: 3rem;
  background: url("img7/BackIcon.png") no-repeat 0.5rem 0.7rem; }

/*
    侧边栏内容
*/
.cb {
  position: absolute;
  width: 80vw;
  margin-top: 3rem;
  transform: translateX(-100%);
  background-color: #fff; }

input[type="checkbox"]:checked ~ .cb,
input[type="checkbox"]:checked ~ .main {
  transform: translateX(80vw);
  transition: transform 0.4s ease; }

input[type="checkbox"] {
  display: none; }

/*
  内容
*/
.top-box {
  width: 100%;
  height: 5rem;
  background-color: #fff; }

.t-b-p {
  font-size: 1.8rem;
  color: #9a9a9a; }

.t-b-div {
  right: 0;
  width: 2rem;
  height: 3rem;
  background: url("img7/BackIcon.png") no-repeat left -3.5rem; }

/*
    捉鬼游戏
*/
.game {
  height: 4rem;
  margin-top: 1rem;
  font-size: 1.8rem;
  color: #fbb435;
  background-color: #fff;
  border-bottom: 1px solid #fbb435; }



<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1 user-scalable=no" />
    <title>Title</title>
    <link rel="stylesheet" type="text/css" href="task7-1.css">
</head>
<body>
<!--
    页头
-->
<header>
    <div class="header fixed-t">
        <label for="menu" class="la"></label>
    </div>
</header>
<input type="checkbox" id="menu">
<ul class="cb">
    <li class="cb-gg">
        <img src="img7/laba.png">
        <p>公告</p>
    </li>
    <li class="cb-li"></li>
    <li class="cb-li"></li>
    <li class="cb-li"></li>
</ul>
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        <a class="con-a cen-cen a-none" href="#">简化版</a>
        <p class="con-p cen-cen">有1133个用户正在玩此款游戏</p>
        <a class="con-a cen-cen a-none" href="#">猜词版</a>
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        <p class="con-p cen-cen">有1133个用户正在玩此款游戏</p>
        <a class="con-a cen-cen a-none" href="#">白痴版</a>
        <p class="con-p cen-cen">有1133个用户正在玩此款游戏</p>
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