javascript实例

JS实例

 

1、跑马灯

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="i1" style="background-color: #74086e;color: #ccdcef;font-size: 55px;text-align: center">欢迎 X X X 莅临指导</div>
 
<script type="text/javascript">
    setInterval(function(){
        d1 = document.getElementById('i1');  //用DOM获取标签
        d1_text = d1.innerText;  //获取标签内的文本
 
        first_char = d1_text[0];  //字符串索引
 
        sub_char = d1_text.slice(1,d1_text.length);  //字符串切片    d1_text.length获取文本长度
 
        new_str = sub_char + first_char;  //字符串拼接
 
        d1.innerText = new_str;
    },500)
</script>
 
</body>
</html>

　　

2、模态对话框

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .hide{
            display: none;
        }
        .c1{
            position: fixed;
            top:0;
            bottom: 0;
            left:0;
            right: 0;
            background: rgba(0,0,0,.5);
            z-index: 2;
        }
        .c2{
            background-color: white;
            position: fixed;
             400px;
            height: 300px;
            top:50%;
            left: 50%;
            z-index: 3;
            margin-top: -150px;
            margin-left: -200px;
        }
    </style>
</head>
<body>
<div>
    <table>
        <tr>
            <td>1</td>
            <td>2</td>
            <td><input type="button" value="点我" onclick="Show();"></td>
        </tr>
    </table>
</div>
<div id="shade" class="c1 hide"></div>
<div id="modal" class="c2 hide">
    <p>用户：<input type="text" /></p>
    <p>密码：<input type="password" /></p>
<p>
    <input type="button" value="确定">
    <input type="button" value="取消" onclick="Hide();">
</p>
    </div>
 
<script>
    function Show(){
        document.getElementById('shade').classList.remove('hide');
        document.getElementById('modal').classList.remove('hide');
    }
     function Hide(){
        document.getElementById('shade').classList.remove('hide');
        document.getElementById('modal').classList.remove('hide');
    }
</script>
 
</body>
</html>

　　

3、 折叠菜单

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
     <style>
        ul{
            padding: 0;
            margin: 0;
        }
        .hide{
            display: none;
        }
        .menu{
             200px;
            height: 500px;
            background-color: #2459a2;
            border: 2px solid #333;
        }
        .menu .title{
            background-color: brown;
            cursor: pointer;
        }
        .menu .content{
            background-color: white;
        }
    </style>
</head>
<body>
 
    <div class="menu">
        <div class="item">
            <div class="title" onclick="Show(this);">菜单一</div>
            <div class="content">
                <ul>
                    <li>内容1</li>
                    <li>内容1</li>
                    <li>内容1</li>
                </ul>
            </div>
        </div>
        <div class="item">
            <!--arg.下一个标签nex-->
            <div class="title" onclick="Show(this);">菜单二</div>
            <div class="content hide">
                <ul>
                    <li>内容2</li>
                    <li>内容2</li>
                    <li>内容2</li>
                </ul>
            </div>
        </div>
        <div class="item">
            <div class="title" onclick="Show(this);">菜单三</div>
            <div class="content hide">
                <ul>
                    <li>内容3</li>
                    <li>内容3</li>
                    <li>内容3</li>
                </ul>
            </div>
        </div>
        <div class="item">
            <div class="title" onclick="Show(this);">菜单四</div>
            <div class="content hide">
                <ul>
                    <li>内容4</li>
                    <li>内容4</li>
                    <li>内容4</li>
                </ul>
            </div>
        </div>
    </div>
<script>
    function Func(arg,a2){
        console.log(arg,a2);
    }
     function Func1(arg){
        console.log(arg);
    }
    function Show(arg){
        //arg当前菜单
        //console.log(arg);
        arg.nextElementSibling.classList.remove('hide');
        var father = arg.parentElement;
        var sons = father.parentElement.children;
        for (var i=0;i<sons.length;i++){
            var current_ele = sons[i];
            if(current_ele == father){
 
            }else{
                current_ele.children[1].classList.add('hide');
            }
        }
    }
</script>
</body>
</html>

　　

 4、搜索框

输入框内含文字，鼠标点击后文字消失。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .gg{
            color: gray;
        }
        .bb{
            color: black;
        }
    </style>
</head>
<body>
<!--<!–<input type="text" placeholder="请输入内容" />–>  /*下面代码实现这个功能*/-->
 
<input type="text" class="gg" value="请输入内容" onfocus="Focus(this);" onblur="Blur(this);" />
 
<script>
    function Focus(ths){
        //查找
        ths.className = "bb";
        var current_val = ths.value;
        if(current_val == "请输入内容"){
            ths.value = "";
        }
    }
    function Blur(ths){
        var current_val = ths.value;
        if(current_val=='请输入内容' || current_val.trim().length == 0){
            ths.value = '请输入内容';
            ths.className = 'gg';
        }
    }
</script>
 
</body>
</html>

　　

5、 选择栏

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div>
        <input type="button" value="全选" ondblclick="CheckAll();"/>
        <input type="button" value="取消" ondblclick="CancleAll();"/>
        <input type="button" value="反选" onclick="ReverseAll();"/>
    </div>
<table>
    <thead>
        <tr>
            <th>序号</th>
            <th>用户号</th>
            <th>年龄</th>
        </tr>
    </thead>
<tbody id="tb">
        <tr>
            <td><input class="c1" type="checkbox" /></td>
            <td>alex</td>
            <td>19</td>
        </tr>
         <tr>
            <td><input class="c1" type="checkbox" /></td>
            <td>alex</td>
            <td>19</td>
        </tr>
         <tr>
            <td><input class="c1" type="checkbox" /></td>
            <td>alex</td>
            <td>19</td>
        </tr>
        <tr>
            <td><input class="c1" type="checkbox" /></td>
            <td>alex</td>
            <td>19</td>
        </tr>
    </tbody>
</table>
 
<script>
    function CheckAll(){
        var tb = document.getElementById('tb');
        var checks = tb.getElementsByClassName('c1');
        for(var i=0;i<checks.length;i++){
            var current_check = checks[i];
            current_check.checked = true;
        }
    }
    function CancleAll(){
        var tb = document.getElementById('tb');
        var checks = tb.getElementsByClassName('c1');
        for(var i=0;i<checks.length;i++){
            var current_check = checks[i];
            current_check.checked = false;
        }
    }
    function ReverseAll(){
        var tb = document.getElementById('tb');
        var checks = tb.getElementsByClassName('c1');
        for(var i=0;i<checks.length;i++){
            var current_check = checks[i];
            if (current_check.checked){
                current_check.checked = false;
            }else{
                current_check.checked = true;
            }
        }
    }
</script>
</body>
</html>

效果：

　

&

互斥

 效果：

 6、点击

点击后更换内容

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <input type="button" onclick="Func();" value="点我" />
    <div id="i1">
        <div class="c1">123</div>
         <div class="c1">123</div>
         <div class="c1" alex="sb">123</div>
         <div class="c1">123</div>
         <div class="c1" alex="sb">123</div>
         <div class="c1">123</div>
         <div class="c1" alex="sb">123</div>
         <div class="c1">123</div>
         <div class="c1" alex="sb">123</div>
         <div class="c1">123</div>
 
    </div>
    <script>
        function Func(){
            var i1 = document.getElementById('i1');
            var divs = i1.children;
            for (var i=0;i<divs.length;i++){
                var current_div = divs[i];
                var result = current_div.getAttribute('alex');
                if(result == "sb"){
                    current_div.innerText = "456"
                }
            }
        }
    </script>
</body>
</html>

　　

 7、菜单

点击一个菜单显示菜单下的内容

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        ul{
            list-style: none;
            padding: 0;
            margin: 0;
        }
        ul li{
            float: left;
            background-color: #2459a2;
            color: white;
            padding: 8px 10px;
        }
        .clearfix:after{
            display: block;
            content: '.';
            height: 0;
            visibility: hidden;
            clear: both;
        }
        .hide{
            display: none;
        }
        .tab-menu .title{
            background-color: #dddddd;
        }
        .tab-menu .title .active{
            background-color: white;
            color: black;
        }
        .tab-menu .content{
            border: 1px solid #dddddd;
            min-height: 150px;
        }
    </style>
</head>
<body>
<div style=" 400px;margin: 0 auto">
    <div class="tab-menu">
        <div class="title clearfix">
            <ul>
                <li target="h1" class="active" onclick="Show(this);">价格趋势</li>
                 <li target="h3" class="active" onclick="Show(this);">市场分布</li>
                 <li target="h2" class="active" onclick="Show(this);">其他</li>
            </ul>
        </div>
        <div id="content" class="content">
            <div con="h1">content1</div>
            <div con="h2" class="hide">content2</div>
            <div con="h3" class="hide">content3</div>
        </div>
    </div>
</div>
<script>
    function Show(ths) {
        //ths 表示当前标签
        var target = ths.getAttribute('target');
        //给自己添加样式active
        //兄弟样式去掉
        ths.className = 'active';
        var brothers = ths.parentElement.children;
        for(var i=0;i<brothers.length;i++){
            if(ths == brothers[i]){
 
            }else{
                brothers[i].removeAttribute('class');
            }
        }
        //操作内容
        var contents = document.getElementById('content').children;
        for(var j=0;j<contents.length;j++){
            var current_content = contents[j];
            var con = current_content.getAttribute('con');
            if(con == target){
                current_content.classList.remove('hide');
            }else{
                current_content.className = "hide";
            }
        }
    }
</script>
 
</body>
</html>

效果显示：

　　

8、多选、单选

点击多个选择栏

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <!--<input id="i1"  type="text" value="123"/>-->
    <!--<input  id="i2" type="password" value="111" />-->
    <!--<textarea id="i3">666</textarea>-->
    <h1>爱好</h1>
    <div id="i1">
        <ul>
            <li> <input type="checkbox" value="1" /> 篮球 </li>
            <li> <input type="checkbox" value="2"/> 足球 </li>
            <li> <input type="checkbox" value="3"/> 去球 </li>
        </ul>
    </div>
    <div id="i2">
        <ul>
            <li> <input type="checkbox" value="11" /> 篮球 </li>
            <li> <input type="checkbox" value="22"/> 足球 </li>
            <li> <input type="checkbox" value="33"/> 去球 </li>
        </ul>
    </div>
    <select id="ii">
        <option value="11">上海</option>
        <option value="22">北京</option>
    </select>
    <script>
 
 
    </script>
</body>
</html>

效果：

　　

9、输入框

输入框内输入内容可以写入文本中

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div>
        <div>
            <input type="text" />
            <input type="button" value="添加" onclick="AddElement(this);" />
        </div>
        <div style="position: relative;">
            <ul id="commentList">
                <li>alex</li>
                <li>eric</li>
            </ul>
        </div>
    </div>
    <script>
        function AddElement(ths) {
            // 获取输入的值
            var val = ths.previousElementSibling.value;
            ths.previousElementSibling.value = "";
            var commentList = document.getElementById('commentList');
            //第一种形式，字符串方式
            //var str = "<li>" + val + "</li>";
            // 'beforeBegin'、 'afterBegin'、 'beforeEnd'、 'afterEnd'
            // beforeEnd内部最后
            // beforeBegin 外部上边
            //afterBegin  内部贴身
            //afterEnd    外部贴墙
            //commentList.insertAdjacentHTML("beforeEnd",str);
            //第二种方式，元素的方式
            var tag = document.createElement('li');
            tag.innerText = val;
            var temp = document.createElement('a');
            temp.innerText = '百度';
            temp.href = "http://etiantian.org";
            tag.appendChild(temp);
            // commentList.appendChild(tag);
            commentList.insertBefore(tag,commentList.children[1]);
        }
    </script>
</body>
</html>

　效果：

　

10、固定左菜单栏

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<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<style>
 
    body{
        margin: 0px;
    }
    img {
        border: 0;
    }
    ul{
        padding: 0;
        margin: 0;
        list-style: none;
    }
    h1{
        padding: 0;
        margin: 0;
    }
    .clearfix:after {
        content: ".";
        display: block;
        height: 0;
        clear: both;
        visibility: hidden;
    }
 
    .wrap{
         980px;
        margin: 0 auto;
    }
 
    .pg-header{
        background-color: #303a40;
        -webkit-box-shadow: 0 2px 5px rgba(0,0,0,.2);
        -moz-box-shadow: 0 2px 5px rgba(0,0,0,.2);
        box-shadow: 0 2px 5px rgba(0,0,0,.2);
    }
    .pg-header .logo{
        float: left;
        padding:5px 10px 5px 0px;
    }
    .pg-header .logo img{
        vertical-align: middle;
         110px;
        height: 40px;
 
    }
    .pg-header .nav{
        line-height: 50px;
    }
    .pg-header .nav ul li{
        float: left;
    }
    .pg-header .nav ul li a{
        display: block;
        color: #ccc;
        padding: 0 20px;
        text-decoration: none;
        font-size: 14px;
    }
    .pg-header .nav ul li a:hover{
        color: #fff;
        background-color: #425a66;
    }
    .pg-body{
 
    }
    .pg-body .catalog{
        position: absolute;
        top:60px;
         200px;
        background-color: #fafafa;
        bottom: 0px;
    }
    .pg-body .catalog.fixed{
        position: fixed;
        top:10px;
    }
 
    .pg-body .catalog .catalog-item.active{
        color: #fff;
        background-color: #425a66;
    }
 
    .pg-body .content{
        position: absolute;
        top:60px;
         700px;
        margin-left: 210px;
        background-color: #fafafa;
        overflow: auto;
    }
    .pg-body .content .section{
        height: 500px;
        border: 1px solid red;
    }
</style>
<body onscroll="ScrollEvent();">
<div class="pg-header">
    <div class="wrap clearfix">
        <div class="logo">
            <a href="#">
                <img src="http://core.pc.lietou-static.com/revs/images/common/logo_7012c4a4.pn">
            </a>
        </div>
        <div class="nav">
            <ul>
                <li>
                    <a  href="#">首页</a>
                </li>
                <li>
                    <a  href="#">功能一</a>
                </li>
                <li>
                    <a  href="#">功能二</a>
                </li>
            </ul>
        </div>
 
    </div>
</div>
<div class="pg-body">
    <div class="wrap">
        <div class="catalog" id="catalog">
            <div class="catalog-item" auto-to="function1"><a>第1张</a></div>
            <div class="catalog-item" auto-to="function2"><a>第2张</a></div>
            <div class="catalog-item" auto-to="function3"><a>第3张</a></div>
        </div>
        <div class="content" id="content">
            <div menu="function1" class="section">
                <h1>第一章</h1>
            </div>
            <div menu="function2" class="section">
                <h1>第二章</h1>
            </div>
            <div menu="function3" class="section" style="height:100px;">
                <h1>第三章</h1>
            </div>
        </div>
    </div>
 
</div>
    <script>
        function ScrollEvent(){
            var bodyScrollTop = document.body.scrollTop;
            if(bodyScrollTop>50){
                document.getElementsByClassName('catalog')[0].classList.add('fixed');
            }else{
                document.getElementsByClassName('catalog')[0].classList.remove('fixed');
            }
 
            var content = document.getElementById('content');
            var sections = content.children;
            for(var i=0;i<sections.length;i++){
                var current_section = sections[i];
 
                // 当前标签距离顶部绝对高度
                var scOffTop = current_section.offsetTop + 60;
 
                // 当前标签距离顶部，相对高度
                var offTop = scOffTop - bodyScrollTop;
 
                // 当前标签高度
                var height = current_section.scrollHeight;
 
                if(offTop<0 && -offTop < height){
                    // 当前标签添加active
                    // 其他移除 active
 
                    // 如果已经到底部，现实第三个菜单
                    // 文档高度 ＝ 滚动高度 + 视口高度
 
                    var a = document.getElementsByClassName('content')[0].offsetHeight + 60;
                    var b = bodyScrollTop + document.documentElement.clientHeight;
                    console.log(a+60,b);
                    if(a == b){
                        var menus = document.getElementById('catalog').children;
                        var current_menu = document.getElementById('catalog').lastElementChild;
                        current_menu.classList.add('active');
                        for(var j=0;j<menus.length;j++){
                            if(menus[j] == current_menu){
 
                            }else{
                                menus[j].classList.remove('active');
                            }
                        }
                    }else{
                        var menus = document.getElementById('catalog').children;
                        var current_menu = menus[i];
                        current_menu.classList.add('active');
                        for(var j=0;j<menus.length;j++){
                            if(menus[j] == current_menu){
 
                            }else{
                                menus[j].classList.remove('active');
                            }
                        }
                    }
 
 
 
 
                    break;
                }
 
            }
 
 
        }
    </script>
</body>
</html>

　效果：

　

11、滚动菜单（升级版）

固定左菜单栏并且滑动内容章节，菜单栏也跟随变化到该章节

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body{
            margin: 0;
            background-color: #dddddd;
        }
        .w{
            margin: 0 auto;
             980px;
        }
        .pg-header{
            background-color: black;
            color: white;
            height: 48px;
        }
        .pg-body .menu{
            position: absolute;
            left: 200px;
             180px;
            background-color: white;
            float: left;
        }
        .pg-body .menu .active{
            background-color: #425a66;
            color: white;
 
        }
        .pg-body .fixed{
            position: fixed;
            top: 10px;
        }
        .pg-body .content{
            position: absolute;
            left: 385px;
            right: 200px;
            background-color: white;
            float: left;
        }
        .pg-body .content .item{
            height: 900px;
        }
    </style>
</head>
<body onscroll="Hua();">
    <div class="pg-header">
        <div class="w">
 
        </div>
    </div>
    <div class="pg-body">
        <div id="menu" class="menu">
            <ul>
                <li>第一章</li>
                <li>第二章</li>
                <li>第三章</li>
            </ul>
        </div>
        <div id="content" class="content">
            <div class="item">床前明月管</div>
            <div class="item">疑是地上霜</div>
            <div class="item" style="height: 100px;">我是郭德纲</div>
        </div>
 
    </div>
 
    <script>
        function Hua() {
            var huaGao = document.body.scrollTop;
            var caiDan = document.getElementById('menu');
            if(huaGao>48){
                caiDan.classList.add('fixed');
            }else{
                caiDan.classList.remove('fixed');
            }
 
            var items = document.getElementById('content').children;
            for(var i=0;i<items.length;i++){
                var currentItem = items[i];
                var currentItemBodyTop = currentItem.offsetTop + currentItem.offsetParent.offsetTop;
                var currentItemWindowTop = currentItemBodyTop - huaGao;
                console.log(currentItemWindowTop);
                var currentHeight = currentItem.offsetHeight;
                var bottomHeight = currentItemBodyTop+currentHeight;
 
 
                if(currentItemWindowTop<0 && huaGao < bottomHeight){
                    var ziJi = caiDan.getElementsByTagName('li')[i];
                    ziJi.className = 'active';
                    var lis = caiDan.getElementsByTagName('li');
                    for(var j = 0;j<lis.length;j++){
                        if (ziJi == lis[j]){
 
                        }else {
                            lis[j].classList.remove('active');
                        }
                    }
                    break;
 
                }
 
 
            }
 
 
 
        }
    </script>
</body>
</html>

　效果：

　

￥

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原文地址：https://www.cnblogs.com/wu-chao/p/8520687.html