HTML5+CSS3+JS小实例：日月交替切换效果HTML5+CSS3小实例之JS+CSS实现日月交替效果技术栈：HT

HTML5+CSS3+JS小实例之JS+CSS实现日月交替效果

技术栈：HTML+CSS+JS

字体图标库：font-awesome

效果：

源码：

<!DOCTYPE html>
<html>

<head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">

    <title>JS+CSS实现日月交替效果</title>
    <link href="https://cdn.bootcdn.net/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">
    <link rel="stylesheet" href="../css/37.css">
    <script>
        function change(str){
            document.getElementById('container').setAttribute('class',str);
        }
    </script>
</head>

<body>
    <div class="btn-box">
        <div onclick="change('light')"><i class="fa fa-sun-o" aria-hidden="true"></i> 你叉叉</div>
        <div onclick="change('dark')"><i class="fa fa-moon-o" aria-hidden="true"></i> 穷哈哈</div>
    </div>
    <div id="container" class="dark">
        <div class="bg"></div>
        <div class="moon-box">
            <div class="moon"></div>
        </div>
        <div class="sun-box">
            <div class="sun"></div>
        </div>
        <div class="sea"></div>
    </div>
</body>

</html>

body{
    /* 初始化 取消内外边距 */
    margin: 0;
    padding: 0;
}
#container{
    /* 100%窗口高度 */
    height: 100vh;
}
.bg{
    /* 绝对定位 */
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
.sun{
    margin: 0;
    padding: 0;
    /* 绝对定位 水平垂直居中 */
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    width: 600px;
    height: 600px;
    background: orange;
    border-radius: 50%;
}
.moon{
    margin: 0;
    padding: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    /* 计算得出月亮的位置 */
    transform: translate(calc(-50% + -160px),calc(-50% + -180px));
    width: 600px;
    height: 600px;
    /* 通过阴影绘制月亮 */
    box-shadow: 160px 180px 0 cyan;
    border-radius: 50%;
}
.sea{
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 35%;
    /* 背景模糊制造大海的感觉 */
    backdrop-filter: blur(100px);
    -webkit-backdrop-filter: blur(100px);
    z-index: 100;
}
.sun,
.moon,
.sun-box,
.moon-box,
.bg{
    /* 添加动画过渡 */
    transition: all 1s ease-in-out;
}
.sun-box,
.moon-box{
    /* 相对定位 */
    position: relative;
    /* 溢出隐藏 */
    overflow: hidden;
}
/* 白天 */
.light .sun-box{
    height: 100%;
}
.light .moon-box{
    height: 0;
}
.light .bg{
    background: #ffeea2;
}
/* 夜晚 */
.dark .sun-box{
    height: 0;
}
.dark .moon-box{
    height: 100%;
}
.dark .bg{
    background: #040720;
}
/* 按钮 */
.btn-box{
    position: absolute;
    top: 5px;
    left: 5px;
    z-index: 101;
    display: flex;
    flex-direction: row;
}
.btn-box div{
    background: rgba(255, 255, 255, 0.7);
    color: #000;
    width: 90px;
    height: 40px;
    border-radius: 5px;
    text-align: center;
    line-height: 40px;
    margin: 5px;
    font-size: 14px;
    cursor: pointer;
}
.btn-box div:hover{
    background: #fff;
}