WEB前端第二十一課——移動端頁面

知識點記錄:css

1.flex-flow屬性用於設置靈活項目的佈局方式,是 flex-direction 和 flex-wrap的複合屬性,書寫格式 flex-flow:direction  wraphtml

  flex-direction屬性值:佈局

    flex-flow:row,伸縮項目在flexbox中 由左向右水平排列,row-reverse爲相反方向flex

    flex-flow:column,伸縮項目在flexbox中 由上向下垂直排列。column-reverse爲相反方向flexbox

  flex-wrap屬性值:spa

    nowrap,靈活項目不拆行或拆列orm

    wrap,靈活項目在必要的時候拆行或拆列htm

    wrap-reverse,靈活項目必要時候按照相反順序拆行或拆列blog

2.設置元素水平垂直居中ip

  一種狀況,元素有明確的高度

    ① 絕對定位+ 負margin,元素屬性值設置:position: absolute;left:50%;top:50%;margin-left: -w/2(元素寬度一半);margin-top: -h/2(元素高度一半);

    ② 僅適用絕對定位,元素屬性值設置:position: absolute;top: 0;right: 0;bottom: 0;left: 0;margin: auto;

  二種狀況,元素沒有肯定的高度

    ① 絕對定位+ transform,元素屬性值設置:position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);

    ② 模擬 table佈局,父元素屬性設置:display:table;,子元素屬性設置:display:table-cell;text-align:center;vertical-align:middle;,table在佈局方面一般不推薦使用

    ③ 使用僞元素建立居中內容

3.彈性盒子的寬度一般使用百分比進行設置,不設置固定高度,由內容填充後自動撐開,元素內靈活項目默認水平排列

/*>>>>>>>>>>>>>>JS代碼<<<<<<<<<<<<<<<*/
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代碼<<<<<<<<<<<<<<<<*/
body{
    margin: 0;
    padding: 0;
}
/*>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>導航欄設置<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<*/
.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;
}
/*>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>輪播圖設置<<<<<<<<<<<<<<<<<<<<<<<<<<<<<*/
.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代碼<<<<<<<<<<<<<<<<<*/
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-with, initial-scale=1">
    <title>移動端</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">縱橫千里點餐系統</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>
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