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Jquery过滤器

1.表达式过滤

<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />    <title></title>    <script src="../Scripts/jquery-1.9.1.js"></script>    <script type="text/javascript">        $(function () {            $("div").filter(".red").css("background-color", "#495485");            $("p").filter(function (index) {                return $("span", this).length == 2;            }).css("background-color", "red");            $("p").has("span.red").css("background-color", "#652345");        })    </script>    <style type="text/css">        div        {            position: absolute;            width: 100px;            height: 100px;        }        .blue        {            background-color: blue;            left: 0px;        }        .red        {            background-color: red;            left: 120px;            z-index: 2;        }        .green        {            background-color: green;            left: 240px;        }        .pos        {            top: 120px;        }    </style></head><body>    <div class="blue"></div>    <div class="green"></div>    <div class="pos"></div>    <div class="red pos">hhhhhhhhhhhhhhhhhhhhhhhhhhhhh广泛大概</div>    <p><span class="red">hhhhhhhhhhhhhhhhhhhhhhhh第一段文本</span></p>    <p><span>第二段文本</span><span></span></p></body></html>

2.查找

<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>    <title></title>    <script src="../Scripts/jquery-1.9.1.js"></script>    <script type="text/javascript">        $(function () {            $("#menu").children(".home").css("text-decoration", "underline");        })    </script></head><body>      <ul id="menu">        <li class="home">首页</li>        <li>论坛</li>        <li>微博</li>        <li>团购</li>        <li>博客</li>    </ul></body></html>

3.类过滤

<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>    <title></title>    <script src="../Scripts/jquery-1.9.1.js"></script>    <script type="text/javascript">        $(function () {            $("div").click(function () {                if ($(this).hasClass("red"))                    $(this)                       .animate({ left: 120 })                       .animate({ left: 240 })                       .animate({ left: 0 })                       .animate({ left: 240 })                       .animate({ left: 120 });            })        })    </script>    <style type="text/css">        div        {            position:absolute;            width:100px;            height:100px;        }        .blue        {           background-color:blue;           left:0px;        }        .red        {            background-color:red;            left:120px;            z-index:2;        }        .green        {            background-color:green;            left:240px;        }        .pos        {            top:120px;        }    </style></head><body>    <div class="blue" ></div>    <div class="green"></div>    <div class="pos"></div>    <div class="red pos" >广泛大概</div></body></html>

4.判断是否包含元素

<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />    <title></title>    <script src="http://www.mamicode.com/Scripts/jquery-1.9.1.js"></script>    <script type="text/javascript">        $(function () {            $("p").has("span.red").css("background-color", "red");            if ($("div").has("p")) {                alert("当前JQuery对象中包含span子元素。");            }        })    </script></head><body>    <p><span class="red">第一段文本</span></p>    <p><span class="red">第2段文本</span><span></span></p>    <p>第3段文本</p>    <div class="blue"></div>    <div class="red"></div>    <div class="green"></div>    <div class="black"></div></body></html>

 5.向下查找后代元素

<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />    <title></title>    <script src="../Scripts/jquery-1.4.1.js"></script>    <script type="text/javascript">        $(function () {            var j = $("body>div");            alert(j.children("div").length);//返回3个元素            alert(j.find("div").length);//返回5个元素            alert(j.contents().length);//返回7个元素,5个div,2个文本节点(空格)        })    </script></head><body>    <div>        <div>            <div></div>            <div></div>        </div>        <div></div>        <div></div>    </div></body></html>

6.映射清洗截取

<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>    <title></title>    <script src="../Scripts/jquery-1.9.1.js"></script>    <script type="text/javascript">        //映射        $(function () {            $("p").append($("input").map(function () {                return $(this).val();            }).get().join(""));              });    </script>    <script type="text/javascript">        //清洗        $(function () {            $("#menu li").not(".home").css("color", "red");        })    </script>    <script type="text/javascript">        $(function () {            $("#mn li").slice(2, 4).css("color", "red");        })           </script></head><body>    <p><b>注册信息:</b></p>    <input type="text" name="name"  value="用户名"/>    <input type="text" name="password" value="密码" />    <input type="text" name="url" value="http://baidu.com" />    <ul id="menu">        <li class="home">首页</li>        <li>论坛</li>        <li>微博</li>        <li>团购</li>        <li>博客</li>    </ul>    <ul id="mn">        <li class="home">首页2</li>        <li>论坛2</li>        <li>微博2</li>        <li>团购2</li>        <li>博客2</li>    </ul></body></html>

 

Jquery过滤器