WEB前端第二十一课——移动端页面

知识点记录:

1.flex-flow属性用于设置灵活项目的布局方式,是 flex-direction 和 flex-wrap的复合属性,书写格式 flex-flow:direction  wrap

  flex-direction属性值:

    flex-flow:row,伸缩项目在flexbox中 由左向右水平排列,row-reverse为相反方向

    flex-flow:column,伸缩项目在flexbox中 由上向下垂直排列。column-reverse为相反方向

  flex-wrap属性值:

    nowrap,灵活项目不拆行或拆列

    wrap,灵活项目在必要的时候拆行或拆列

    wrap-reverse,灵活项目必要时候按照相反顺序拆行或拆列

2.设置元素水平垂直居中

  一种情况,元素有明确的高度

    ① 绝对定位+ 负margin,元素属性值设置:position: absolute;left:50%;top:50%;margin-left: -w/2(元素宽度一半);margin-top: -h/2(元素高度一半);

    ② 仅适用绝对定位,元素属性值设置:position: absolute;top: 0;right: 0;bottom: 0;left: 0;margin: auto;

  二种情况,元素没有确定的高度

    ① 绝对定位+ transform,元素属性值设置:position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);

    ② 模拟 table布局,父元素属性设置:display:table;,子元素属性设置:display:table-cell;text-align:center;vertical-align:middle;,table在布局方面通常不推荐使用

    ③ 使用伪元素创建居中内容

3.弹性盒子的宽度通常使用百分比进行设置,不设置固定高度,由内容填充后自动撑开,元素内灵活项目默认水平排列

/*>>>>>>>>>>>>>>JS代码<<<<<<<<<<<<<<<*/
var click=document.getElementById("click");
var imgBox=document.getElementById("imgBox");
var li=click.getElementsByTagName("li");

function change(i){
   if(i==0){
        imgBox.src="../images/chuangPic/banner1.png"
   }else if(i==1){
       imgBox.src="../images/chuangPic/banner2.jpg"
   }else if(i==2){
       imgBox.src="../images/chuangPic/banner3.jpg"
   }else if(i==3){
       imgBox.src="../images/chuangPic/banner4.jpg"
   }else if(i==4){
       imgBox.src="../images/chuangPic/banner5.jpg"
   }
}
/*>>>>>>>>>>>>>>>>CSS代码<<<<<<<<<<<<<<<<*/
body{
    margin: 0;
    padding: 0;
}
/*>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>导航栏设置<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<*/
.nav{
    width: 100%;
    height: 50px;
    background-color: rgb(0,127,95);
    display: flex;
    position: fixed;
    z-index: 9;
}
.city{
    width: 80px;
    height: 50px;
    font-size: 18px;
    color: #ffffff;
    background-color: #ff6700;
    line-height: 50px;
    text-align: center;
}
.city a{
    color: #ffffff;
    text-decoration: none;
}
.head{
    height: 50px;
    line-height: 50px;
    color: #ffffff;
    font-size: 20px;
    letter-spacing: 2px;
    flex-grow: 1;
    text-align: center;
}
.search button{
    width: 50px;
    height: 50px;
    color: #ffffff;
    font-size: 24px;
    line-height: 50px;
    background-color: rgba(0,0,0,0);
    border: 0;
    cursor: pointer;
}
/*>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>轮播图设置<<<<<<<<<<<<<<<<<<<<<<<<<<<<<*/
.carousel{
    width: 100%;
    position: relative;
}
.carousel img{
    width: 100%;
}
.click{
    width: 100%;
    height: 5%;
    bottom: 5%;
    position: absolute;
}
.click ul{
    width: 60%;
    height: 100%;
    margin: 0 auto;
    padding: 0;
    display: flex;
    justify-content: space-between;
}
.click ul>li{
    list-style-type: none;
    width: 18%;
    height: 100%;
    background-color: rgb(0,127,95);
}
/*>>>>>>>>>>>>>>>>html代码<<<<<<<<<<<<<<<<<*/
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-with, initial-scale=1">
    <title>移动端</title>
    <link rel="stylesheet" href="css/chuangstyle.css"/>
    <link rel="stylesheet" href="css/chuangicon/iconfont.css">
</head>
<body>
    <div class="nav">
        <div class="city">成都 <a href="#" class="iconfont"></a></div>
        <div class="head">纵横千里点餐系统</div>
        <div class="search">
            <button class="iconfont"></button>
        </div>
    </div>
    <div class="carousel">
        <img src="images/chuangpic/banner1.png" alt="" id="imgBox"/>
        <div class="click">
            <ul id="click">
                <li onclick="change(0)"></li>
                <li onclick="change(1)"></li>
                <li onclick="change(2)"></li>
                <li onclick="change(3)"></li>
                <li onclick="change(4)"></li>
            </ul>
        </div>
    </div>
    <script src="css/index.js"></script>
</body>
</html>

  

posted @ 2020-08-13 15:30  后来喵  阅读(429)  评论(0编辑  收藏  举报