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bootstrap中的col-xs-*,col-sm-*,col-的意义

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媒体查询响应式

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<div class="container">
    <div class="row">
        <div class="col-md-4">col-md-4</div>
        <div class="col-md-4">col-md-4</div>
        <div class="col-md-4">col-md-4</div>
    </div>
    <div class="row">
        <div class="col-md-4">col-md-4</div>
        <div class="col-md-8">col-md-8</div>

    </div>
    <div class="row">
        <div class="col-md-3">col-md-3</div>
        <div class="col-md-6">col-md-6</div>
        <div class="col-md-3">col-md-3</div>
  
    </div>

英文换行；表格长宽

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class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

表格:table-layout:fixed
文字"word-break:break-all

不使用bootstrap的组件库自己写折叠导航栏；

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表单元素

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<div class="row" id="header-second">
                <div class="header-second-one">
                    <img src="./www.jnshu.com.png" alt="">
                </div>
                <div class="header-second-twe">
                    <form>
                        <button type="button"><img src="./heengxian.png" alt=""></button>
                        <input type="radio"name="nav" value=""><a href="./task9-1.html">首页</a>
                        <input type="radio" name="nav" value=""><a href="./task9-1.html">职位</a>
                        <input type="radio"name="nav" value=""><a href="./task9-1.html">推荐</a>
                        <input type="radio" name="nav" value=""><a href="./task9-1.html">首页</a>
                    </form>
                </div>
            </div>
        </div>

移动端与PC端适配

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媒体查询

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

media only screen and (min-width: 401px){
    html {
        font-size: 25px !important;
    }
}
@media only screen and (min-width: 428px){
    html {
        font-size: 26.75px !important;
    }
}
@media only screen and (min-width: 481px){
    html {
        font-size: 30px !important;
    }
}
@media only screen and (min-width: 569px){
    html {
        font-size: 35px !important;
    }
}
@media only screen and (min-width: 641px){
    html {
        font-size: 40px !important;
    }
}

@media only screen and (min-width: 768px){
    html {
        font-size: 48px !important;
    }
}

@media only screen and (min-width: 1024px){
    html {
        font-size: 64px !important;
    }
}
@media only screen and (min-width: 1440px){
    html {
        font-size: 90px !important;
    }
}

input和lable关联的奇怪问题

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通用

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

 display：none和

option居中

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通用

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

option {
    font-weight: normal;
    display: block;
    white-space: pre;
    min-height: 1.2em;
    padding: 0px 2px 1px;
    text-align:center;
}

不用js怎么实现滚动条及文本鼠标移上去时改变颜色

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hover

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

<div class="mybar">
    <div class="progress">
        <div class="progress-bar progress-bar-warning" role="progressbar"
             aria-valuenow="60" aria-valuemin="0" aria-valuemax="100"
             style="width: 25%;">
            <span class="sr-only">25% 完成（警告）</span>
        </div>
    </div>
    <div class="figure">
        <span class="circle1">1</span>
        <span class="circle">2</span>
        <span class="circle">3</span>
        <span class="circle">4</span>
    </div>
    <div class="step">
        <div>1.定制纸箱</div>
        <div>2.选择数量</div>
        <div>3.上传附件</div>
        <div>4.确认下单</div>
    </div>
</div>



.mybar {
    width: 62%;
    float: right;
    padding-right: 19%;
    margin-top: 40px;
}

.step {
    color: #d3d3d3;
    display: flex;
    justify-content: space-around;
    font-size: 18px;
}

.step div:first-child {
    color: #ff7f02;
}

.figure {
    display: flex;
    justify-content: space-around;
    font-size: 16px;
}

.progress {
    height: 5px;
}

.progress-bar-warning {
    background: #ff7f02;
}

怎么实现侧边栏的不用js实现点击隐藏跟显示？

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导航栏

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

无

input复选框，另作一行再制作后，没有相应的点击效果

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input

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

HTML代码
 <div class="container">
            <div class="box-1">
                <input id="box1" type="radio" name="boxes">
                <label for="box1">对口箱</label>
                <input id="box2" type="radio" name="boxes">
                <label for="box2">飞机盒</label>
                <input id="box3" type="radio" name="boxes">
                <label for="box3">天地盖</label>
                <div class="dropdown box-2">
                    <button class="btn btn-default dropdown-tggle" type="button" id="menu1" data-toggle="dropdown" aria-expanded="false">
                        参看详情
                        <div class="box-3">
                            <span class="box-4"></span>
                        </div>
                    </button>
                    <ul class="dropdown-menu dropdown-menu-right">
                        <li>
                            <a href="#">详情1</a>
                        </li>
                        <li role="presentation" class="bottom"></li>
                        <li>
                            <a href="#">详情2</a>
                        </li>
                        <li role="presentation" class="bottom"></li>
                        <li>
                            <a href="#">详情3</a>
                        </li>
                        <li role="presentation" class="bottom"></li>
                    </ul>
                </div>
            </div>
        </div>
        <div class="container win">
            <div class="box">
                <div class="bg-2"></div>确定尺寸
            </div>
        </div>
        <div class="container">
            <div class="box-5">.
                <input id="box2" type="radio" name="boxes-2">
                <label for="box2">外径</label>
                <input id="box2" type="radio" name="boxes-2">
                <label for="box2">内径</label>
            </div>
        </div>

css代码
.box-1 {
    display: inline-block;
    padding: 2.3rem 1.8rem 2.3rem 4.5rem;
    width: 100%;
    text-align: left;
    background-color: #fbfcff;
    border: 1px solid #e8e8e8;
}

input[type="radio"] {
    position: absolute;
    clip: rect(0, 0, 0, 0);
}

label {
    float: left;
    margin-top: .5rem;
    margin-right: 6rem;
    font-weight: 400;
    font-size: 1.8rem;
    color: #666;
    cursor: pointer;
}

input[type="radio"] + label::before {
    content: "";
    display: inline-block;
    vertical-align: middle;
    margin-top: -.3rem;
    margin-right: 1.6rem;
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    border: 1px solid #d6d6d6;
    background-color: #f8f9fb;
}

input[type="radio"]:checked + label::before {
    border: 8px solid #1d7ad9;
    background-color: #fff;
}

.box-2 {
    float: right;
    width: 13.5rem;
    height: 3.7rem;
}

.box-2 > button {
    padding: .5rem 0 .5rem 1.5rem;
    border-radius: 0;
    width: 100%;
    height: 100%;
    font-size: 1.4rem;
    line-height: 2.5rem;
    color: #999;
}

.box-3 {
    display:inline-block;
    margin-left: 1.5rem;
    width: 2.5rem;
    height: 100%;
    vertical-align: middle;
    background-color: #1d7ad9;
    color: #fff;
}

.box-4 {
    display: inline-block;
    width: 0;
    height: 0;
    vertical-align: middle;
    border-top: .4rem solid;
    border-left: .4rem solid transparent;
    border-right: .4rem solid transparent;
}

.dropdown-menmu > li >a {
    display: block;
    padding: .6rem 3rem;
    font-weight: 400;
    line-height: 1.42857143;
    color: #333;
    white-space: nowrap;
}

.win {
    margin-top: -.5rem;
}

.bg-2 {
    display: inline-block;
    margin-left: -2.9rem;
    margin-right: 1rem;
    width: 2.2rem;
    height: 2rem;
    background: url(./images/4.png) -2rem -7.5rem;
}

.box-5 {
    display: inline-block;
    padding: 2.3rem 1.8rem 2.3rem 4.5rem;
    width: 100%;
    text-align: left;
    background-color: #fbfcff;
    border: 1px solid #e8e8e8;
}

任务15的代码规范有哪几种，哪些会好用通俗一点

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通用

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 截图

class="cursor-pointer"> 代码

/* 重置 */
div,p,ul,ol,li{margin:0;padding:0;}
/* 默认 */
strong,em{font-style:normal;font-weight:bold;}
/* 统一调用背景图 */
.m-logo a,.m-nav a,.m-nav em{background:url(images/sprite.png) no-repeat 9999px 9999px;}
/* 统一清除浮动 */
.g-bdc:after,.m-dimg ul:after,.u-tab:after{display:block;visibility:hidden;clear:both;height:0;overflow:hidden;content:'.';}
.g-bdc,.m-dimg ul,.u-tab{zoom:1;}
/* 布局 */
.g-sd{float:left;width:300px;}
/* 模块 */
.m-logo{width:200px;height:50px;}
/* 元件 */
.u-btn{height:20px;border:1px solid #333;}
/* 功能 */
.f-tac{text-align:center;}
/* 皮肤 */
.s-fc,a.s-fc:hover{color:#fff;}