js点击图片切换

时间:2022-09-28 _洋人气:0
实现效果：图片点击切换
代码：
<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="../reset.css">
    <style>
        .img-list{
            width: 480px;
            height: 850px;
            margin: 0 auto;
            /* 为a提供参照 */
            position:relative;
        }
        img{
            width: 480px;
            height: 850px;
            object-fit: cover;
        }
        .img-list li{
            /* 开启绝对定位使之可以设置 z-index */
            position: absolute;
        }
        .img-list li:nth-child(3){
            z-index: 1;
        }
        .pointer{
            /* 开启绝对定位放在上面 */
            position: absolute;
            z-index: 999;
            bottom: 40px;
            margin-left: 140px;
        }
        .pointer a{
            /* display: block; */
            /* 横向排列 */
            float: left;
            width: 20px;
            height: 20px;
            background-color: salmon;
            margin-left: 20px;
            border-radius: 50%;
            background-color: rgba(0, 0, 0, 0.3);


            /*默认情况下background-color的颜色是会延伸到边框下面的，如果我们不想要延申，需要设置 */
            background-clip: content-box;
            border:2px solid transparent;
        }
        .pointer a.active,
        .pointer a:hover
        {
            background-color: #fff;
            border:3px solid rgba(0, 0, 0, 0.3);

        }
        
    </style>
    <script>
        window.onload =function(){
            var imgArray = ["./img/1.jpg","./img/2.jpg","./img/3.jpg","./img/4.png","./img/5.jpg"];
            var allA =  document.getElementsByTagName("a");
            var img = document.getElementsByTagName("img")[0];

            for(var i =0 ;i<allA.length;i++){
                allA[i].num = i;
                allA[i].onclick=function(){
                    // 使用this.name,！！不能使用allA[i].name,因为i此时已经等于5了。
                    var index = this.num;
                    img.src=imgArray[index];

                     for(var j =0 ;j<allA.length;j++){
                         allA[j].className="";
                     }
                    this.className = "active";
                }
            }
        }
    </script>

</head>
<body>
    <ul class="img-list">
        <li><img src="./img/1.jpg" alt=""></li>
        <!-- <li><a href="javascript:;"><img src="./img/2.jpg" alt=""></a></li>
        <li><a href="javascript:;"><img src="./img/3.jpg" alt=""></a></li>
        <li><a href="javascript:;"><img src="./img/4.png" alt=""></a></li>
        <li><a href="javascript:;"><img src="./img/5.jpg" alt=""></a></li> -->

        <div class="pointer">
            <a href="javascript:;" class="active"></a>
            <a href="javascript:;"></a>
            <a href="javascript:;"></a>
            <a href="javascript:;"></a>
            <a href="javascript:;"></a>
        </div>
    </ul>
</body>
</html>
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