27-选项卡
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>选项卡</title>
    <style type="text/css">
        *{
            padding: 0;
            margin: 0;
        }
        ul{
            list-style-type: none;
        }
        ul li{
            float: left;
            width: 160px;
            height: 60px;
            line-height: 60px;
            text-align: center;
            background-color: #999999;
        }
        #tab{
            width: 480px;
            margin: 20px auto;
            border: 1px solid red;
        }
        li.active{
            background-color: #FFFFFF;
        }
        ul li a{
            text-decoration: none;
            color: #333333;
        }
        p.active{
            display: block;
        }
        p{
            display: none;
            height: 200px;
            text-align: center;
            line-height: 200px;
            background: #FFFFFF;
        }
    </style>
</head>
<body>
    <div id="tab">
        <ul>
            <li class="active"><a href="#">首页</a></li>
            <li><a href="#">新闻</a></li>
            <li><a href="#">图片</a></li>
        </ul>
         <p class="active">首页内容</p>
         <p class>新闻内容</p>
         <p class>图片内容</p>
    </div>
</body>
<script type="text/javascript">
    var tabi = document.getElementsByTagName('li');
    var tabContent = document.getElementsByTagName('p');
    for (var i = 0;i < tabi.length; i++){
        //保存变量 i
        tabi[i].index = i;
        tabi[i].onclick = function () {
            for (var j = 0;j < tabi.length;j++){
                tabi[j].className = '';
                tabContent[j].className = '';
            }
            this.className = 'active';
            tabContent[this.index].className = 'active';
        }
    }
</script>
</html>

28-仿淘宝搜索框
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>淘宝搜索框</title>
    <style type="text/css">
        *{
            padding: 0;
            margin: 0;
        }
        #search{
            position: relative;
        }
        label{
            position: absolute;
            font-size: 20px;
            top: 8px;
            left: 80px;
            color: #999999;
        }
        input{
            outline: none;
            display: block;
            width: 400px;
            height: 40px;
            font-size: 20px;
            border: 2px solid yellowgreen;
            margin-left: 20px;
            margin-top: 20px;
            border-radius: 5px;
        }
    </style>
</head>
<body>
    <div id="search">
        <input type="text" id="text" />
        <label for="text" id="msg">pandaboy</label>
    </div>
</body>
<script type="text/javascript">
    var text = document.getElementById('text');
    var msg = document.getElementById('msg');
    // 检测用户输入的表单控件
    text.oninput = function () {
        if (this.value == ''){
            msg.style.display = 'block';
        }else {
            msg.style.display = 'none';
        }
    }
</script>
</html>

29-获取当前最新的时间
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>获取当前时间</title>
    <style type="text/css">
        /**{*/
            /*padding: 0;*/
            /*margin: 0;*/
        /*}*/
    </style>
</head>
<body>
    <div></div>
</body>
<script type="text/javascript">
    // document.body.innerHTML = '123';
    setInterval(function () {
        var date = new Date();
        var y = date.getFullYear();
        var m = date.getMonth();
        var d = date.getDate();
        var h = date.getHours();
        var min = date.getMinutes();
        var s = date.getSeconds();
    //    现在是xxxxn年xx月xx日 xx:xx:xx
        document.body.innerHTML = "现在是"+y+'年'+(m+1)+'月'+d+'日' +" "+num(h)+':'+num(min)+':'+num(s);
    },1000);
    function num(n) {
        if (n<10){
            return '0'+n;
        }
        return n;
    }
</script>
</html>

30-匀速运动案例
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>匀速运动事件</title>
    <style type="text/css">
        *{
            padding: 0;
            margin: 0;
        }
        .box{
            width: 200px;
            height: 200px;
            background-color: red;
            position: absolute;
            top: 50px;
            left: 0;
        }
    </style>
</head>
<body>
    <div id="wrap">
        <button id="btn">运动</button>
        <div class="box" id="box1"></div>
    </div>
</body>
<script type="text/javascript">
    var btn = document.getElementById('btn');
    var box1 = document.getElementById('box1');
    var count = 0;
    var time = null;
    btn.onclick = function () {
        // box1.style.left = '20px';
        setInterval(function () {
            count += 0.2;
            if (count > 1000){
                clearInterval(time);
                box1.style.display = 'none';
            }
            box1.style.left = count+'1px';
        },10)
    }
</script>
</html>

31-5秒之后关闭广告
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>5秒后关闭</title>
    <style type="text/css">
        *{
            padding: 0;
            margin: 0;
        }
        img{
            position: fixed;
            cursor: move;
        }
        #left{
            left: 0;
        }
        #right{
            right: 0;
        }
        ul{
            list-style-type: none;
        }
        ul li{
            font-size: 25px;
        }
    </style>
</head>
<body>
    <img src="bd_logo1.png" id="left"/>
    <img src="bd_logo1.png" id="right"/>
    <ul>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
        <li>123123</li>
    </ul>
</body>
<script type="text/javascript">
    window.onload = function () {
        var left = document.getElementById('left');
        var right = document.getElementById('right');
        setTimeout(function () {
            left.style.display = 'none';
            right.style.display = 'none';
        },3000)
    }
</script>
</html>

32-小米滚动
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>滚动图</title>
    <style type="text/css">
        *{
            padding: 0;
            margin: 0;
        }
        .warp{
            position: relative;
            width: 512px;
            height: 400px;
            border: 3px solid coral;
            overflow: hidden;
            margin: 100px auto;
        }
        img{
            position: absolute;
            top: 0;
            left: 0;
        }
        .up{
            position: absolute;
            width: 512px;
            height: 200px;
        }
        .down{
            position: absolute;
            width: 512px;
            height: 200px;
            top:200px;
        }
    </style>
</head>
<body>
    <div id="box" class="warp">
        <img src="mi.png" id="xiaomi"/>
        <span class="up" id="picUp"></span>
        <span class="down" id="picDown"></span>
    </div>
</body>
<script type="text/javascript">
    var up = document.getElementById('picUp');
    var down = document.getElementById('picDown');
    var img = document.getElementById('xiaomi');
    var count = 0;
    var time = null;
    up.onmouseover = function () {
        //不管怎样,先清除定时器
        clearInterval(time);
        time = setInterval(function () {
            count -= 3;
            count >= -2100 ? img.style.top = count + 'px':clearInterval(time) ;
        },30)
    };
    down.onmouseover = function () {
        clearInterval(time);
        time = setInterval(function () {
            count += 3;
            count <= 0 ? img.style.top = count + 'px':clearInterval(time) ;
        },30)
    }
</script>
</html>

33-无缝轮播图
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>无缝轮播</title>
    <style type="text/css">
        *{
            padding: 0;
            margin: 0;
        }
        .box{
            width: 300px;
            height: 150px;
            margin: 50px auto;
            overflow: hidden;
            position: relative;
        }
        ul{
            list-style-type: none;
        }
        ul li{
            float: left;
        }
        .box ul{
            width: 400%;
            position: absolute;
            top: 0;
            left: 0;
        }
    </style>
</head>
<body>
    <div class="box">
        <ul>
            <li><img src="../img/safe-1.jpg" /></li>
             <li><img src="../img/safe-2.jpg" /></li>
             <li><img src="../img/safe-3.jpg" /></li>
             <li><img src="../img/safe-4.jpg" /></li>
 
 
        </ul>
    </div>
</body>
<script type="text/javascript">
    var box = document.getElementsByClassName('box')[0];
    var ul = box.children[0];
    var num = 0;
    var time = null;
    time = setInterval(autoPlay,30);
    function autoPlay() {
        num--;
        num <= -600 ? num = 0:num;
        ul.style.left = num + 'px';
 
    }
    box.onmouseover = function () {
        clearInterval(time)
    };
    box.onmouseout = function () {
       time = setInterval(autoPlay,30);
    }
</script>
</html>

34-BOM_输出
// 1.JS的核心就是ECMA DOM BOM
    // 2.BOM就是 Browser Object Model 浏览器
    // 输出 屏幕的宽高等 滚动的宽高 setInterval... window.open() close() location
    // 1.alert()
    // 浏览器的调试
    // 2.console.log()
    // 获取用户的输入框内容
    // 3.prompt()
    // 4. confirm 多一个取消键
    //    如果点击确定,返回true 如果点击取消,返回的是false

35-open_close
<!--行间的js中的open,window不能省略-->
    <button onclick="window.open('https://www.baidu.com/')">按钮</button>
    <button>百度</button>
    <button onclick="window.close()">关闭网页</button>
    <button>关闭</button>
</body>
<script type="text/javascript">
    var oBtn = document.getElementsByTagName('button')[1];
    var cBtn = document.getElementsByTagName('button')[3];
    oBtn.onclick = function () {
        // open('https://www.baidu.com');
        // 打开空白页面
        open('about:blank','_self');
 
    };
    cBtn.onclick = function () {
        if(confirm('是否关闭')){
           close();
        }
    };

36-BOM的其他对象
// 返回浏览器的用户设备信息
console.log(window.navigator.userAgent);
console.log(window.location);
// 经常使用的方法
// window.location.href = 'https://www.baidu.com';
// 全局刷新,尽量少用
window.location.reload();

37-client系列
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Client</title>
    <style type="text/css">
        .box{
            width: 200px;
            height: 200px;
            position: absolute;
            border: 1px yellowgreen solid;
            margin: 10px 0 0 0;
            padding: 10px;
        }
    </style>
</head>
<body>
    <div class="box"></div>
</body>
<script type="text/javascript">
    var oBox = document.getElementsByClassName('box')[0];
    console.log(oBox.clientTop); //边框顶部的宽度
    console.log(oBox.clientLeft); //边框左部的距离
    console.log(oBox.clientHeight); //内容区域+ 上下padding值
    console.log(oBox.clientWidth); //内容区域 + 左右padding值
</script>
</html>

38-屏幕的可视区域
window.onload = function () {
        console.log(document.documentElement.clientWidth);
        console.log(document.documentElement.clientHeight);
    };
    window.onresize = function () {
        console.log(document.documentElement.clientWidth);
        console.log(document.documentElement.clientHeight);
    }

39-offset系列
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>offset</title>
</head>
<body>
<div id="box" style="width: 200px;height: 200px ;border:1px solid red;padding: 10px">
 
</div>
</body>
<script type="text/javascript">
window.onload = function () {
// 占位宽高
// offsetTop: 如果盒子没有设置定位,就是到浏览器的顶部的距离
var box = document.getElementById('box');
console.log(box.offsetTop);
console.log(box.offsetLeft);
console.log(box.offsetWidth);
console.log(box.offsetHeight);
}
</script>
</html>

40-scroll系列
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>scroll</title>
    <style type="text/css">
        *{
            padding: 0;
            margin: 0;
        }
    </style>
</head>
<body style="width: 2000px;height: 2000px">
    <!--滚动系列-->
    <div style="height: 200px;background: green"></div>
    <div style="height: 200px;background: red"></div>
    <div style="height: 200px;background: beige"></div>
    <div style="height: 200px;background: gray"></div>
    <div style="height: 200px;background: tan"></div>
    <div style="height: 200px;background: aqua"></div>
    <div style="width: 200px;height: 200px;border: 1px solid red; overflow: auto" id="scroll">
        <p>12312312312312312312</p>
        <p>12312312312312312312</p><p>12312312312312312312</p>
        <p>12312312312312312312</p>
        <p>12312312312312312312</p>
        <p>12312312312312312312</p>
        <p>12312312312312312312</p>
        <p>12312312312312312312</p>
        <p>12312312312312312312</p>
        <p>12312312312312312312</p>
        <p>12312312312312312312</p>
        <p>12312312312312312312</p>
        <p>12312312312312312312</p>
        <p>12312312312312312312</p>
        <p>12312312312312312312</p>
    </div>
 
</body>
    <script type="text/javascript">
        window.onload = function () {
            //实时监听滚动事件
            window.onscroll = function () {
                // console.log(1);
                // console.log('上'+document.documentElement.scrollTop);
                // console.log('左'+document.documentElement.scrollLeft);
                // console.log('宽'+document.documentElement.scrollWidth);
                // console.log('高'+document.documentElement.scrollHeight);
            };
            var s = document.getElementById('scroll');
            s.onscroll  = function () {
              console.log('上'+s.scrollTop);
              console.log('左'+s.scrollLeft);
              console.log('宽'+s.offsetWidth);
              console.log('高'+s.scrollHeight); //内容的高度(包含padding但是不包含margin)
            };
        }
    </script>
</html>

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