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<!DOCTYPE HTML>
<html>
<head>
<title>遮罩层大图</title>
<meta charset="UTF-8">
<script src="http://cdn.bootcss.com/jquery/1.11.3/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
//小图点击事件
$(".piclist").on("click",function(){
$(".cur_big_pic").attr("src",$(this).attr("src"));
$(".top_level").show();
});
//关闭遮罩层
$(".close_top").on("click",function(){
$(".top_level").hide();
});

});
</script>
<style>
/*小图start*/
ul{
list-style: none;
}
ul li{
padding:5px;
float:left;
}
.piclist{
width:200px;
height:400px;
cursor:pointer;
}
/*小图end*/
/*大图start*/
.top_level{
display:none;
position:absolute;
width:100%;
height:100%;
background:#000000;
overflow:hidden;
}
.close_top{
padding:20px;
cursor:pointer;
color:#ffffff;
background:#00ff00;
}
/*大图end*/
</style>
</head>
<body>
<div>
<ul>
<li><img class="piclist" src="https://tse1-mm.cn.bing.net/th/id/OIP-C.Zte3ljd4g6kqrWWyg-8fhAHaEo?w=314&h=196&c=7&r=0&o=5&pid=1.7"/></li>
</ul>
</div>
<div class="top_level">
<div><span class="close_top">X</span></div>
<div><img class="cur_big_pic" src="images/error.jpg"></div>
</div>
</body>
</html>

/* 全局样式 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Courier New', Courier, monospace;
    background-color: #f9ebea;
    color: #444444;
}

header, main, footer {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: #cfb6b6;
}

h1 {
    font-size: 48px;
    text-align: center;
    margin-bottom: 20px;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: space-around;
}

nav li {
    margin: 0 10px;
}

nav a {
    text-decoration: none;
    color: #ffffff;
    font-size: 24px;
    transition: color 0.3s ease-in-out;
}

nav a:hover {
    color: #a05858;
}

main h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.partner-name {
    font-weight: bold;
}

footer {
    text-align: center;
    background-color: #cfb6b6;
}

a {
  color: #808080;
  text-decoration: none;
  font-family: "Courier New", Times, serif;
  font-size: 24px;
}

a:hover {
  color: #c0c0c0;
}


/* 响应式布局 */
@media (max-width: 600px) {
    h1 {
        font-size: 36px;
    }
    
    nav a {
        font-size: 20px;
    }
    
    main h2 {
        font-size: 28px;
    }
}

本项目引用的自定义外部资源

jquery.js