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js 与 jquery

js 与 jquery

作者: Sakura_flower | 来源:发表于2018-11-12 20:07 被阅读0次

图片

a2.jpg a3.jpg picture-1.jpg picture-2.jpg picture-3.jpg slide-1.jpg slide-2.jpg slide-3.jpg slide-4.jpg thumb-1.jpg thumb-2.jpg thumb-3.jpg

mylib颜色随机

function randomColor() {
    var r = parseInt(Math.random() * 128 + 128);
    var g = parseInt(Math.random() * 128 + 128);
    var b = parseInt(Math.random() * 128 + 128);
    return 'rgb(' + r + ', ' + g + ', ' + b + ')';
}

延迟跳转

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>延迟跳转</title>
    </head>
    <body>
        <h3><span id="counter">5</span>秒钟以后自动跳转到百度</h3>
        <script>
            var countDown = 5;
            var span = document.getElementById('counter');
            window.setTimeout(function() {
                countDown -= 1;
                if (countDown == 0) {
                    // window对象的location属性代表浏览器地址栏
                    window.location.href = 'https://www.baidu.com';
                } else {
                    span.textContent = countDown;
                    // arguments是函数中的隐含对象
                    // 通过arguments[0]、arguments[1]可以获得函数的参数
                    // 通过arguments.callee可以获得正在被调用的函数
                    window.setTimeout(arguments.callee, 1000);
                }
            }, 1000);
            
        </script>
    </body>
</html>

轮翻界面

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <style>
            #adv {
                width: 705px;
                margin: 0 auto;
            }
        </style>
    </head>
    <body>
        <div id="adv">
            <img src="img/slide-1.jpg" alt="" width="705">
        </div>
        <script>
            var index = 0;
            var images = ['slide-1.jpg', 'slide-2.jpg', 'slide-3.jpg', 'slide-4.jpg']
            // 通过document对象获取页面元素的常用方法有5个: 
            // document.getElementById('...') ==> 通过ID获取单个元素
            // document.getElementsByTagName('...') ==> 通过标签名获取元素的列表
            // document.getElementsByClassName('...') ==> 通过类名获取元素的列表
            // document.querySelector('...') ==> 通过样式表选择器获取单个元素
            // document.querySelectorAll('...') ==> 通过样式表选择器获取元素的列表
            var img = document.querySelector('img');
            // var img = document.getElementsByTagName('img')[0];
            var timerId;
            
            startIt();
            
            var div = document.querySelector('#adv');
            div.addEventListener('mouseover', stopIt);
            div.addEventListener('mouseout', startIt);
            
            function startIt() {
                timerId = window.setInterval(function() {
                    index += 1;
                    index %= images.length;
                    img.src = 'img/' + images[index];
                }, 2000);
            }
            
            function stopIt() {
                window.clearInterval(timerId);
            }
        </script>
    </body>
</html>

按钮事件

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <style>
            #buttons>button {
                border: none;
                outline: none;
                width: 120px;
                height: 40px;
                font: 22px/40px Arial;
                background-color: red;
                color: white;
            }
        </style>
    </head>
    <body>
        <div id="buttons">
            <button><input type="checkbox">苹果</button>
            <button><input type="checkbox">香蕉</button>
            <button><input type="checkbox">草莓</button>
            <button><input type="checkbox">蓝莓</button>
            <button><input type="checkbox">榴莲</button>
            <button><input type="checkbox">西瓜</button>
            <button><input type="checkbox">芒果</button>
            <button><input type="checkbox">柠檬</button>
        </div>
        <script>
            var buttons = document.querySelectorAll('#buttons>button');
            for (var i = 0; i < buttons.length; i += 1) {
                buttons[i].firstChild.addEventListener('click', function(evt) {
                    var checkbox = evt.target || evt.srcElement;
                    if (checkbox.checked) {
                        checkbox.parentNode.style.backgroundColor = 'lightseagreen';
                    } else {
                        checkbox.parentNode.style.backgroundColor = 'red';
                    }
                    evt.stopPropagation();
                });
                buttons[i].addEventListener('click', function(evt) {
                    // 通过事件对象的target属性可以获取事件源(谁引发了事件)
                    // 但是有的浏览器是通过srcElement属性获取事件源的
                    // 可以通过短路或运算来解决这个兼容性问题
                    var button = evt.target || evt.srcElement;
                    // 当获取到一个元素之后可以通过它的属性来获取它的父元素、子元素以及兄弟元素
                    // parentNode - 父元素
                    // firstChild / lastChild / children - 第一个子元素 / 最后一个子元素 / 所有子元素
                    // previousSibling / nextSibling - 前一个兄弟元素 / 后一个兄弟元素
                    var checkbox = button.firstChild;
                    checkbox.checked = !checkbox.checked;
                    if (checkbox.checked) {
                        button.style.backgroundColor = 'lightseagreen';
                    } else {
                        button.style.backgroundColor = 'red';
                    }
                });
            }
        </script>
    </body>
</html>

增加删除事件

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style>
            * {
                margin: 0;
                padding: 0;
            }
            #container {
                margin: 20px 50px;
            }
            #fruits li {
                list-style: none;
                width: 200px;
                height: 50px;
                font-size: 20px;
                line-height: 50px;
                background-color: cadetblue;
                color: white;
                text-align: center;
                margin: 2px 0;
            }
            #fruits>li>a {
                float: right;
                text-decoration: none;
                color: white;
                position: relative;
                right: 5px;
            }
            #fruits~input {
                border: none;
                outline: none;
                font-size: 18px;
            }
            #fruits~input[type=text] {
                border-bottom: 1px solid darkgray;
                width: 200px;
                height: 50px;
                text-align: center;
            }
            #fruits~input[type=button] {
                width: 80px;
                height: 30px;
                background-color: coral;
                color: white;
                vertical-align: bottom;
                cursor: pointer;
            }
        </style>
    </head>
    <body>
        <div id="container">
            <ul id="fruits">
                <li>苹果<a href="">×</a></li>
                <li>香蕉<a href="">×</a></li>
                <li>火龙果<a href="">×</a></li>
                <li>西瓜<a href="">×</a></li>
            </ul>
            <input id='name' type="text" name="fruit">
            <input id="ok" type="button" value="确定">
        </div>
        <script src="js/jquery.min.js"></script>
        <script>
            function removeItem(evt) {
                evt.preventDefault();
                // $函数的第四种用法:参数是原生的JS对象
                // 将原生的JS对象包装成对应的jQuery对象
                $(evt.target).parent().remove();
            }
            
            // $函数的第一种用法: 参数是另一个函数
            // 传入的函数是页面加载完成之后要执行的回调函数
            // $(document).ready(function() {});
            $(function() {
                // $函数的第二种用法:参数是一个选择器字符串
                // 获取元素并得到与之对应的jQuery对象(伪数组)
                $('#fruits a').on('click', removeItem);
                $('#ok').on('click', function() {
                    var fruitName = $('#name').val().trim();
                    if (fruitName.length > 0) {
                        $('#fruits').append(
                            // $函数的第三种用法:参数是一个标签字符串
                            // 创建新元素并得到与之对应的jQuery对象
                            $('<li>').text(fruitName).append(
                                $('<a>').attr('href', '').text('×').on('click', removeItem)
                            )
                        );
                    }
                    // 对jQuery对象使用下标运算或调用get()方法会得到原生JS对象
                    $('#name').val('').get(0).focus();
                });
            });
        </script>
    </body>
</html>

恶意广告事件

<!DOCTYPE html>
<html lang="zh">
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style>
            #adv {
                width: 200px;
                height: 200px;
                color: yellow;
                position: fixed;
                right: 10px;
                top: 10px;
                background-color: blue;
            }
            #adv button {
                float: right;
                border: none;
                outline: none;
                color: white;
                background-color: gray;
            }
        </style>
    </head>
    <body>
        <div id="adv">
            此广告位招租
            <button>关闭</button>
        </div>
        <script>
            +function() {
                var advDiv = document.querySelector('#adv');
                var button = document.querySelector('#adv button');
                var counter = 0;
                button.addEventListener('click', function() {
                    counter += 1;
                    if (counter < 3) {
                        var currentStyle = 
                            document.defaultView.getComputedStyle(advDiv);
                        var newTop = parseInt(currentStyle.top) + 20;
                        var newRight = parseInt(currentStyle.right) + 20;
                        advDiv.style.top = newTop + 'px';
                        advDiv.style.right = newRight + 'px';
                    } else {
                        advDiv.style.display = 'none';
                    }
                });
            }();
            // 鼠标按下 - mousedown
            // 鼠标移动 - mousemove
            // 鼠标松开 - mouseup
            // clientX / clientY - 鼠标的横纵坐标
        </script>
    </body>
</html>

表格和AV事件

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <style>
            #data {
                border-collapse: collapse;
            }
            #data td, #data th {
                width: 120px;
                height: 40px;
                text-align: center;
                border: 1px solid black;
            }
            #buttons {
                margin: 10px 0;
            }
        </style>
    </head>
    <body>
        <table id="data">
            <caption>数据统计表</caption>
            <tbody>
            <tr>
                <th>姓名</th>
                <th>年龄</th>
                <th>性别</th>
                <th>身高</th>
                <th>体重</th>
            </tr>
            <tr>
                <td>Item1</td>
                <td>Item2</td>
                <td>Item3</td>
                <td>Item4</td>
                <td>Item5</td>
            </tr>
            <tr>
                <td>Item1</td>
                <td>Item2</td>
                <td>Item3</td>
                <td>Item4</td>
                <td>Item5</td>
            </tr>
            <tr>
                <td>Item1</td>
                <td>Item2</td>
                <td>Item3</td>
                <td>Item4</td>
                <td>Item5</td>
            </tr>
            <tr>
                <td>Item1</td>
                <td>Item2</td>
                <td>Item3</td>
                <td>Item4</td>
                <td>Item5</td>
            </tr>
            <tr>
                <td>Item1</td>
                <td>Item2</td>
                <td>Item3</td>
                <td>Item4</td>
                <td>Item5</td>
            </tr>
            <tr>
                <td>Item1</td>
                <td>Item2</td>
                <td>Item3</td>
                <td>Item4</td>
                <td>Item5</td>
            </tr>
            </tbody>
        </table>
        <div id="buttons">
            <button id="pretty">隔行换色</button>
            <button id="clear">清除数据</button>
            <button id="remove">删单元格</button>
            <button id="hide">隐藏表格</button>
        </div>
        <!-- jQuery: Write Less Do More -->
        <!-- 加载本地的jQuery文件适合开发和测试时使用 -->
        <script src="js/jquery.min.js"></script>
        <!-- 下面的方式适合商业项目通过CDN服务器来加速获取jQuery的JS文件 -->
        <!-- <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script> -->
        <script>
            // JavaScript Object Notation == JSON
            var stu = {
                'id': 1001,
                'name': '崔毅钊',
                'age': 20,
                'study': function(course) {
                    alert(this.name + '正在学习' + course);
                },
                'watchAv': function() {
                    if (this.age >= 18) {
                        alert(this.name + '正在观看岛国动作片');
                    } else {
                        alert(this.name + '只能观看《熊出没》');
                    }
                }
            };
            stu.study('Python');
            stu.watchAv();
            
            $(function() {
                $('#hide').on('click', function() {
                    // 根据样式表选择器获取元素 获取到的不是原生的JS对象
                    // 而是经过jQuery封装过后的对象(有更多的方法方便操作)
                    $('#data').fadeOut(3000);
                });
                $('#remove').on('click', function() {
                    $('#data tr:gt(0):last-child').remove();
                });
                $('#clear').on('click', function() {
                    $('#data tr:gt(0)>td').empty();
                });
                $('#pretty').on('click', function() {
                    $('#data tr:gt(0):odd').css({
                        'background-color': '#ccc',
                        'font-size': '36px',
                        'font-weight': 'bolder'
                    });
                    $('#data tr:gt(0):even').css('background-color', '#abc');
                });
            });
        </script>
    </body>
</html>

图片事件

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
    </head>
    <body>
        <button id="ok">换一组</button>
        <div id="container"></div>
        <!-- HTML:超文本标记语言 -->
        <!-- XML:可扩展标签语言 -->
        <!-- XML最为重要的用途是在两个异构的系统之间交换数据 -->
        <!-- 现在这项功能基本上被JSON和YAML格式替代了-->
        <!-- Ajax:Asynchronous JavaScript and XML -->
        <!-- 通过JavaScript代码向服务器发起异步请求并获得数据 -->
        <!-- 异步请求:在不中断用户体验的前提下向服务器发出请求 -->
        <!-- 获得数据后可以通过DOM操作多页面进行局部刷新加载服务器返回的数据 -->
        <script src="js/jquery.min.js"></script>
        <script type="text/javascript">
            $(function () {
                $('#ok').on('click', function () {
                    $.ajax({
                        'url': 'http://api.tianapi.com/meinv/',
                        'type': 'get',
                        'data': {
                            'key': '772a81a51ae5c780251b1f98ea431b84',
                            'num': 5
                        },
                        'dataType': 'json',
                        'success': function(jsonObj) {
                            $('#container').empty();
                            $.each(jsonObj.newslist, function(index, mmObj) {
                                var img = $('<img>').attr('width', '250')
                                                    .attr('src', mmObj.picUrl);
                                $('#container').append(img);
                            });
                        }
                    });
                    
//                  var url = 'http://api.tianapi.com/meinv/?key=a14cd737296561438484e90cac1abd45&num=4'
//                  $.getJSON(url, function(jsonObj) {
//                      $('#container').empty();
//                      $.each(jsonObj.newslist, function(index, elem) {
//                          $('#container').append(
//                              $('<img>').attr('width', '250').attr('src',elem.picUrl)
//                          );
//                      });
//                  });
                });
            });
        </script>
    </body>
</html>

小圆点指定轮翻事件

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style>
            * {
                margin: 0;
                padding: 0;
            }
            #adv {
                width: 940px;
                margin: 0 auto;
            }
            #adv ul {
                width: 120px;
                height: 30px;
                margin: 0 auto;
                position: relative;
                top: -30px;
            }
            #adv li {
                width: 30px;
                height: 30px;
                list-style: none;
                float: left;
                color: #ccc;
                cursor: pointer;
            }
            #adv li:first-child {
                color: lightseagreen;
            }
        </style>
    </head>
    <body>
        <div id="adv">
            <img src="img/slide-1.jpg" alt="">
            <ul>
                <li class="dot">●</li>
                <li class="dot">●</li>
                <li class="dot">●</li>
                <li class="dot">●</li>
            </ul>
        </div>
        <script>
            var img = document.querySelector('#adv>img');
            var items = document.querySelectorAll('#adv li');
            var timerId = 0;
            
            for (var i = 0; i < items.length; i += 1) {
                items[i].index = i;
                items[i].addEventListener('mouseover', function(evt) {
                    index = evt.target.index;
                    changeItemsColor(index);
                    img.src = 'img/' + images[index];
                    if (timerId != 0) {
                        window.clearInterval(timerId);
                        timerId = 0;
                    }
                });
                items[i].addEventListener('mouseout', startIt);
            }
            
            var images = ['slide-1.jpg', 'slide-2.jpg', 'slide-3.jpg', 'slide-4.jpg'];
            var index = 0;
            
            startIt();
            
            function startIt() {
                if (timerId == 0) {
                    timerId = window.setInterval(function() {
                        index += 1;
                        index %= images.length;
                        changeItemsColor(index);
                        img.src = 'img/' + images[index];
                    }, 2000);
                }
            }
            
            function changeItemsColor(index) {
                for (var i = 0; i < items.length; i += 1) {
                    items[i].style.color = '#ccc';
                }
                items[index].style.color = 'lightseagreen';
            }
        </script>
    </body>
</html>

小方块指定轮翻事件

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style>
            * {
                margin: 0;
                padding: 0;
            }
            #container {
                margin: 10px 20px;
            }
            #container li {
                float: left;
                list-style: none;
                width: 60px;
                height: 60px;
            }
        </style>
    </head>
    <body>
        <div id="container">
            <img src="img/picture-1.jpg" alt="狗屎">
            <ul id="items">
                <li><img src="img/thumb-1.jpg" alt=""></li>
                <li><img src="img/thumb-2.jpg" alt=""></li>
                <li><img src="img/thumb-3.jpg" alt=""></li>
            </ul>
        </div>
        <script>
            var img = document.querySelector('#container>img');
            var images = document.querySelectorAll('#items img');
            for (var i = 0; i < images.length; i += 1) {
                // 事件回调函数在for循环的时候并没有执行所以也取不到循环变量i当前的值
                // JavaScript是动态弱类型语言可以在运行时动态的添加(或删除)对象的属性
                images[i].picture = 'img/picture-' + (i + 1) + '.jpg';
                images[i].addEventListener('mouseover', function(evt) {
                    img.src = evt.target.picture;
                });
            }
        </script>
    </body>
</html>

添加闪烁事件

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
        <style>
            #container {
                width: 800px;
                height: 400px;
                margin: 10px auto;
                border: 1px solid black;
                overflow: hidden;
            }
            #buttons {
                width: 800px;
                margin: 10px auto;
                text-align: center;
            }
            #add, #fla {
                border: none;
                outline: none;
                width: 80px;
                height: 30px;
                background-color: red;
                color: white;
                font-size: 16px;
                cursor: pointer;
            }
            .small {
                width: 80px;
                height: 80px;
                float: left;
            }
        </style>
    </head>
    <body>
        <div id="container"></div>
        <div id="buttons">
            <button id="add">添加</button>
            <button id="fla">闪烁</button>
        </div>
        <script src="js/mylib.js"></script>
        <script>
            var bigDiv = document.querySelector('#container');
            var addButton = document.querySelector('#add');
            addButton.addEventListener('click', function() {
                var smallDiv = document.createElement('div');
                 smallDiv.className = 'small';
                // smallDiv.style.width = '80px';
                // smallDiv.style.height = '80px';
                // smallDiv.style.float = 'left';
                smallDiv.style.backgroundColor = randomColor();
                bigDiv.insertBefore(smallDiv, bigDiv.firstChild);
            });
            var flaButton = document.querySelector('#fla');
            var isFlashing = false;
            var timerId;
            flaButton.addEventListener('click', function(evt) {
                isFlashing = !isFlashing;
                if (isFlashing) {
                    timerId = window.setInterval(function() {
                        var divs = document.querySelectorAll('#container>div');
                        for (var i = 0; i < divs.length; i += 1) {
                            divs[i].style.backgroundColor = randomColor();
                        }
                    }, 10);
                    flaButton.textContent = '暂停';
                } else {
                    window.clearInterval(timerId);
                    flaButton.textContent = '闪烁';
                }
            });
        </script>
    </body>
</html>

购物车事件


<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <style>
            * { 
                margin: 0;
                padding: 0;
            }
            body {
                width: 960px;
                margin: 20px auto;
            }
            #cart {
                margin: 0 auto;
                width: 850px;
            }
            #cart-header {
                height: 40px;
                background-color: lightgray;
                margin-bottom: 20px;
            }
            #cart-header div {
                line-height: 40px;
            }
            .left {
                float: left;
            }
            .right {
                float: right;
            }
            .w110 {
                width: 100px;
            }
            .ml10 {
                margin-left: 10px;
            }
            .w120 {
                width: 120px;
            }
            .w250 {
                width: 250px;
            }
            .center {
                text-align: center;
            }
            .w20 {
                width: 20px;
            }
            .w90 {
                width: 90px;
            }
            .clear {
                clear: both;
            }
            #cart-items>div {
                height: 100px;
            }
            #cart-items>div>div {
                line-height: 100px;
            }
            .w250 span {
                display: inline-block;
                font-size: 12px;
                line-height: 16px !important;
            }
            .single-item {
                border-bottom: 1px solid gray;
            }
            .small-button {
                display: inline-block;
                width: 20px;
                height: 20px;
                border: none;
            }
            .big-button {
                color: white;
                background-color: red;
                display: inline-block;
                width: 120px;
                height: 40px;
                border: none;
                font-size: 22px;
            }
            #totalCount, #totalPrice {
                color: red;
            }
            #totalPrice {
                font: bolder 20px Arial;
                display: inline-block;
                width: 150px;
            }
            #cart a {
                text-decoration: none;
            }
            #cart a:link, #cart a:visited, #cart a:active {
                color: gray;
            }
        </style>
    </head>
    <body>
        <div id="cart">
            <div id="cart-header">
                <div class="left w110 ml10">
                    <input id="selectAll" type="checkbox">
                    <label for="selectAll">全选</label>
                </div>
                <div class="left w250">商品</div>
                <div class="left w120 center">单价</div>
                <div class="left w120 center">数量</div>
                <div class="left w120 center">小计</div>
                <div class="left w120 center">操作</div>
            </div>
            <div id="cart-items">
                <div class="clear single-item">
                    <div class="left w20 ml10">
                        <input name="selectOne" type="checkbox">
                    </div>
                    <div class="left w90">
                        <a href="">
                            <img src="img/a1.jpg">
                        </a>
                    </div>
                    <div class="left w250">
                        <span>
                        海澜之家/Heilan Home春装商务白衬衫男修身HNCAD3A067Y 漂白(69) 漂
                        </span>
                    </div>
                    <div class="left w120 center">&yen;<span class="price">138.00</span></div>
                    <div class="left w120 center">
                        <button class="small-button">-</button>
                        <input class="center count" readonly type="text" size="3" value="1">
                        <button class="small-button">+</button>
                    </div>
                    <div class="left w120 center">&yen;<span>138.00</span></div>
                    <div class="left w120 center">
                        <a href="javascript:void(0);">删除</a>
                    </div>
                </div>
                <div class="clear single-item">
                    <div class="left w20 ml10">
                        <input name="selectOne" type="checkbox">
                    </div>
                    <div class="left w90">
                        <a href="">
                            <img src="img/a2.jpg">
                        </a>
                    </div>
                    <div class="left w250">
                        <span>
                        HLA海澜之家长袖衬衫男牛津纺休闲干净透气HNEAJ1E048A浅灰
                        </span>
                    </div>
                    <div class="left w120 center">&yen;<span class="price">128.00</span></div>
                    <div class="left w120 center">
                        <button class="small-button">-</button>
                        <input class="center count" readonly type="text" size="3" value="1">
                        <button class="small-button">+</button>
                    </div>
                    <div class="left w120 center">&yen;<span>128.00</span></div>
                    <div class="left w120 center">
                        <a href="javascript:void(0);">删除</a>
                    </div>
                </div>
                <div class="clear single-item">
                    <div class="left w20 ml10">
                        <input name="selectOne" type="checkbox">
                    </div>
                    <div class="left w90">
                        <a href="">
                            <img src="img/a3.jpg">
                        </a>
                    </div>
                    <div class="left w250">
                        <span>
                        HLA海澜之家牛津纺清新休闲衬衫2018春季新品质感柔软长袖衬衫男
                        </span>
                    </div>
                    <div class="left w120 center">&yen;<span class="price">99.00</span></div>
                    <div class="left w120 center">
                        <button class="small-button">-</button>
                        <input class="center count" readonly type="text" size="3" value="1">
                        <button class="small-button">+</button>
                    </div>
                    <div class="left w120 center">&yen;99.00</div>
                    <div class="left w120 center">
                        <a href="javascript:void(0);">删除</a>
                    </div>
                </div>
            </div>
            <div id="cart-footer">
                <div class="clear left">
                    <a id="clearSelected" href="javascript:void(0);">删除选中商品</a>
                </div>
                <div class="right">
                    <span>总共选中了<span id="totalCount">0</span>件商品</span>
                    <span>总计: <span id="totalPrice">&yen;0.00</span></span>
                    <button id="pay" class="big-button">去结算</button>
                </div>
            </div>
        </div>
        <script src="js/jquery.min.js"></script>
        <script>
            function calcTotal() {
                var amountsInput = $('.single-item input[type=text]');
                var pricesSpan = $('.single-item .price');
                var checkboxes = $('.single-item input[type=checkbox]');
                var totalAmount = 0;
                var totalPrice = 0;
                amountsInput.each(function(index) {
                    if (checkboxes[index].checked) {
                        var amount = parseInt($(this).val());
                        totalAmount += amount;
                        var price = parseFloat($(pricesSpan[index]).text());
                        var currentPrice = (price * amount).toFixed(2);
                        $(this).parent().next().find('span').text(currentPrice);
                        totalPrice += parseFloat(currentPrice);
                    }
                });
                $('#totalCount').text(totalAmount);
                $('#totalPrice').text('¥' + totalPrice.toFixed(2));
            }
            
            $(function() {              
                $('#selectAll').on('click', function(evt) {
                    $('.single-item input[type=checkbox]').prop('checked', evt.target.checked);
                    calcTotal();
                });
                
                $('.single-item button').on('click', function(evt) {
                    var op = $(evt.target).text();
                    if (op == '-') {
                        var numInput = $(evt.target).next();
                        var num = parseInt(numInput.val());
                        if (num > 1) {
                            numInput.val(num - 1);
                        }
                    } else {
                        var numInput = $(evt.target).prev();
                        var num = parseInt(numInput.val());
                        if (num < 200) {
                            numInput.val(num + 1);
                        }
                    }
                    $(evt.target).parent().parent().find('input[type=checkbox]').prop('checked', true);
                    calcTotal();
                });
                
                $('.single-item input[type=checkbox]').on('click', function() {
                    calcTotal();
                });
                
                $('.single-item a').on('click', function(evt) {
                    if (confirm('确定要删除该商品吗?')) {
                        $(evt.target).parent().parent().remove();
                        calcTotal();
                    }
                });
                
                $('#clearSelected').on('click', function() {
                    if (confirm('确定要删除选中的商品吗?')) {
                        $('.single-item').each(function() {
                            if ($(this).find('input:checkbox').prop('checked')) {
                                $(this).remove();
                            }
                        });
                        calcTotal();
                    }
                });
            });
        </script>
    </body>
</html>

index

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title></title>
        <style>
            * { font-size: 18px; }
            h2 { font-size: 22px; }
            h3 { font-size: 20px; }
            ul li { list-style: circle; }
        </style>
    </head>
    <body>
        <h2>JavaScript课堂案例</h2>
        <hr>
        <h3>Make English as your working language!!!</h3>
        <h3>浏览器中的JavaScript:</h3>
        <ul>
            <li>ECMAScript: JavaScript语法规范</li>
            <li>BOM: 浏览器对象模型(Browser Object Model),把浏览器当成一个对象(window),通过这个对象可以操控浏览器</li>
            <li>DOM: 文档对象模型(Document Object Model),把整个页面当成一个对象(document),通过这个对象可以操作整个页面</li>
        </ul>
        <hr>
        <h3>课堂案例</h3>
        <ol>
            <li><a href="example01.html">例子1:BOM和DOM的感性认识</a></li>
            <li><a href="example02.html">例子2:成都机动车限行查询</a></li>
            <li><a href="example03.html">例子3:延迟跳转到百度</a></li>
            <li>
                <a href="example04.html">例子4:轮播广告</a>
                <span><a href="#homework01">完整效果请参考作业1</a></span>
            </li>
            <li><a href="example05.html">例子5:事件冒泡和事件捕获</a></li>
            <li><a href="example06.html">例子6:获取事件源和访问相关元素</a></li>
            <li><a href="example07.html">例子7:动态添加和删除元素</a></li>
            <li><a href="example08.html">例子8:流氓浮动广告</a></li>
            <li><a href="example09.html">例子9:jQuery实现表格效果</a></li>
            <li><a href="example10.html">例子10:jQuery实现动态列表</a></li>
        </ol>
        <h3>课后练习</h3>
        <ol>
            <li>
                <a name="homework01"></a>
                <a href="homework01.html">练习1:轮播广告</a>
            </li>
            <li><a href="homework02.html">练习2:缩略图效果</a></li>
            <li><a href="homework03.html">练习3:闪烁的方块</a></li>
            <li><a href="homework04.html">练习4:表格效果</a></li>
            <li><a href="homework05.html">练习5:购物车效果</a></li>
        </ol>
    </body>
</html>

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      本文标题:js 与 jquery

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