新手上路——html+css 小demo练习(+源码),持续日更..

1.七彩背景开关
在这里插入图片描述

<style>
        .box {
            width: 100%;
            height: 700px;
        }
        
        button {
            border: none;
            font-size: 16px;
            color: #000;
            border: 1px solid #ccc;
            margin: 0 5px;
        }
    </style>
</head>

<body>
    <div class="box">
        <button class="status">开关</button>
        <button class="red">red</button>
        <button class="orange">orange</button>
        <button class="yellow">yellow</button>
        <button class="green">green</button>
        <button class="cyan">cyan</button>
        <button class="blue">blue</button>
        <button class="purple">purple</button>
    </div>
    <script>
        // 绑定事件
        var box = document.querySelector('.box');
        var statu = document.querySelector('.status');
        var flag = 0;
        statu.onclick = function() {
            if (flag === 0) {
                box.style.backgroundColor = '#000';
                flag = 1
            } else {
                box.style.backgroundColor = '#000';
                flag = 0;
            }
        }
        var box = document.querySelector('.box');
        var red = document.querySelector('.red');
        // var flag = 0;
        red.onclick = function() {
            box.style.backgroundColor = 'red';
        }
        var box = document.querySelector('.box');
        var orange = document.querySelector('.orange');
        // var flag = 0;
        orange.onclick = function() {
            box.style.backgroundColor = 'orange';
        }
        var box = document.querySelector('.box');
        var yel = document.querySelector('.yellow');
        // var flag = 0;
        yel.onclick = function() {
            box.style.backgroundColor = 'yellow';
        }
        var box = document.querySelector('.box');
        var gre = document.querySelector('.green');
        // var flag = 0;
        gre.onclick = function() {
            box.style.backgroundColor = 'green';
        }
        var box = document.querySelector('.box');
        var cyan = document.querySelector('.cyan');
        // var flag = 0;
        cyan.onclick = function() {
            box.style.backgroundColor = 'cyan';
        }
        var box = document.querySelector('.box');
        var blue = document.querySelector('.blue');
        // var flag = 0;
        blue.onclick = function() {
            box.style.backgroundColor = 'skyblue';
        }
        var box = document.querySelector('.box');
        var pur = document.querySelector('.purple');
        // var flag = 0;
        pur.onclick = function() {
            box.style.backgroundColor = 'purple';
        }
    </script>

2.切换背景图
在这里插入图片描述

<style>
        * {
            margin: 0;
            padding: 0;
        }
        
        body {
            width: 100%;
            background: url(images/1.jpg) no-repeat center top;
        }
        
        li {
            list-style: none;
        }
        
        .baidu {
            overflow: hidden;
            margin: 100px auto;
            background-color: #fff;
            width: 410px;
            padding-top: 3px;
        }
        
        .baidu li {
            float: left;
            margin: 0 1px;
            cursor: pointer;
        }
        
        .baidu img {
            width: 100px;
        }
    </style>
</head>

<body>
    <ul class="baidu">
        <li><img src="images/kobe1.jpg"></li>
        <li><img src="images/k2.jpg"></li>
        <li><img src="images/k3.jpg"></li>
        <li><img src="images/k4.jpg"></li>
    </ul>
    <script>
        var imgs = document.querySelector('.baidu').querySelectorAll('img');
        for (var i = 0; i < imgs.length; i++) {
            imgs[i].onclick = function() {
                document.body.style.backgroundImage = 'url(' + this.src + ')';
            }
        }
    </script>

3.中心点波浪纹
在这里插入图片描述

    <style>
        body {
            background-color: #333;
        }
        
        .map {
            position: relative;
            width: 200px;
            height: 200px;
            margin: 0 auto;
        }
        
        .city {
            position: absolute;
            top: 227px;
            right: 213px;
            color: #fff;
        }
        
        .tb {
            top: 227px;
            right: 80px;
        }
        
        .dotted {
            width: 8px;
            height: 8px;
            background-color: aqua;
            border-radius: 50%;
        }
        
        .city div[class^="pulse"] {
            /* 保证我们小波纹在父盒子里面水平垂直居中 放大之后就会中心向四周发散 */
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 8px;
            height: 8px;
            box-shadow: 0 0 12px palevioletred;
            border-radius: 50%;
            animation: pulse 1.2s linear infinite;
        }
        
        .city div.pulse2 {
            animation-delay: 0.4s;
        }
        
        .city div.pulse3 {
            animation-delay: 0.8s;
        }
        
        @keyframes pulse {
            0% {}
            70% {
                /* transform: scale(5);  我们不要用scale 因为他会让 阴影变大*/
                width: 40px;
                height: 40px;
                opacity: 1;
            }
            100% {
                width: 70px;
                height: 70px;
                opacity: 0;
            }
        }
    </style>
</head>

<body>
    <div class="map">
        <div class="city">
            <div class="dotted"></div>
            <div class="pulse1"></div>
            <div class="pulse2"></div>
            <div class="pulse3"></div>
        </div>
        <div class="city tb">
            <div class="dotted"></div>
            <div class="pulse1"></div>
            <div class="pulse2"></div>
            <div class="pulse3"></div>
        </div>
    </div>
</body>

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新手上路——html+css 小demo练习(+源码),持续日更..

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