jQuery中的jQuery()方法用法分析

前端之家收集整理的这篇文章主要介绍了jQuery中的jQuery()方法用法分析前端之家小编觉得挺不错的,现在分享给大家,也给大家做个参考。

本文实例讲述了jQuery中的jQuery()方法用法分享给大家供大家参考。具体如下:

jQuery()方法的定义和用法:

方法可以接受一组选择器,用于匹配相应的元素。例如:
代码如下:

在实际应用中,一般用$定义jQuery,其实$就是jQuery的简写,比如$("li")可以写成jQuery("li")。 jQuery的核心功能都是通过此方法实现的,或者说以某种方式使用此方法实现。下面就详细介绍一下次方法用法

语法结构一:

当jQuery()方法没有任何参数的时候,会返回一个空jQuery对象。
代码如下:
实例代码:

代码如下:
<Meta charset="utf-8"/> jQuery()<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a>-编程之家@H_<a href="/tag/301/" target="_blank" class="keywords">301</a>_24@ <script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("button").click(function(){ alert(jQuery().length); }) }) </script> </head> <body> <button>点击查看<a href="/tag/xiaoguo/" target="_blank" class="keywords">效果</a></button> </body> </html> </div></p> <p><h3>语法结构二: </h3><div class="codetitle"><span><a style="CURSOR: pointer" data="41180" class="copybut" id="copybut41180" onclick="doCopy('code41180')"><U></U></a> <a href="/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code41180">jQuery(selector,context)</div> 参数列表:</p> <p> <table class="t_table jbborder" cellspacing="0" style="border-bottom: rgb(227,237,245) 1px solid; border-left: rgb(227,245) 1px solid; text-transform: none; background-color: rgb(255,255,255); text-indent: 0px; width: 653px; border-collapse: collapse; font: small/19px Tahoma,'Microsoft Yahei',Simsun; word-wrap: break-word; white-space: normal; empty-cells: show; table-layout: auto; letter-spacing: normal; height: 104px; color: rgb(68,68,68); border-top: rgb(227,245) 1px solid; border-right: rgb(227,245) 1px solid; word-spacing: 0px; -webkit-text-stroke-width: 0px"> <tbody style="word-wrap: break-word"> <tr style="background-color: rgb(214,214,214); word-wrap: break-word"> <td style="border-bottom: rgb(227,245) 1px solid; padding-bottom: 4px; padding-left: 4px; padding-right: 4px; word-wrap: break-word; font-size: 14px; overflow: hidden; border-top: rgb(227,245) 1px solid; padding-top: 4px"><font size="2" style="word-wrap: break-word">参数</font></td> <td style="border-bottom: rgb(227,245) 1px solid; padding-top: 4px"><font size="2" style="word-wrap: break-word">描述</font></td> </tr> <tr style="background-color: rgb(247,247,247); word-wrap: break-word"> <td width="150" style="border-bottom: rgb(227,245) 1px solid; padding-top: 4px"><font size="2" style="word-wrap: break-word">selector</font></td> <td width="500" style="border-bottom: rgb(227,245) 1px solid; padding-top: 4px"><font size="2" style="word-wrap: break-word">用来匹配元素的选择器。</font></td> </tr> <tr style="background-color: rgb(247,245) 1px solid; padding-top: 4px"><font size="2" style="word-wrap: break-word">context</font></td> <td width="500" style="border-bottom: rgb(227,245) 1px solid; padding-top: 4px"><font size="2" style="word-wrap: break-word">可选。待查找的DOM元素集、文档或者jQuery对象。<br style="word-wrap: break-word" /> 如果没有指定,则就是当前整个文档。</font></td> </tr> </tbody> </table> </p> <p>如果没有指定,则就是当前整个文档。</p> <p>实例<a href="/tag/daima/" target="_blank" class="keywords">代码</a>: 实例一:</p> <p><div class="codetitle"><span><a style="CURSOR: pointer" data="22617" class="copybut" id="copybut22617" onclick="doCopy('code22617')"><U></U></a> <a href="/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code22617"> <!DOCTYPE HTML> <html> <head> <<a href="/tag/Meta/" target="_blank" class="keywords">Meta</a> charset="utf-8"/> <meta name="author" content="//www.jb51.cc/" /> <title>jquery()<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a>-编程之家@H_<a href="/tag/301/" target="_blank" class="keywords">301</a>_24@ <script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("button").click(function(){ $("li").css("color","red"); }) }) </script> </head> <body> <div> <ul> <li>DIV+CSS专区</li> <li>jQuery专区</li> <li>HTML专区</li> </ul> </div> <ul> <li>ASP专区</li> <li>编程之家<span>欢迎您</span></li> </ul> <p>太阳出来了</p> <button>点击查看<a href="/tag/xiaoguo/" target="_blank" class="keywords">效果</a></button> </body> </html> </div></p> <p>以上<a href="/tag/daima/" target="_blank" class="keywords">代码</a>能够将li元素中的字体颜色设置为红色。 实例二:</p> <p><div class="codetitle"><span><a style="CURSOR: pointer" data="4863" class="copybut" id="copybut4863" onclick="doCopy('code4863')"><U></U></a> <a href="/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code4863"> <!DOCTYPE HTML> <html> <head> <<a href="/tag/Meta/" target="_blank" class="keywords">Meta</a> charset="utf-8"/> <meta name="author" content="//www.jb51.cc/" /> <title>jquery()<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a>-编程之家@H_<a href="/tag/301/" target="_blank" class="keywords">301</a>_24@ <script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("button").click(function(){ $("li",$("div")).css("color","red"); }) }) </script> </head> <body> <div> <ul> <li>DIV+CSS专区</li> <li>jQuery专区</li> <li>HTML专区</li> </ul> </div> <ul> <li>ASP专区</li> <li>编程之家<span>欢迎您</span></li> </ul> <p>太阳出来了</p> <button>点击查看<a href="/tag/xiaoguo/" target="_blank" class="keywords">效果</a></button> </body> </html> </div></p> <p>以上<a href="/tag/daima/" target="_blank" class="keywords">代码</a>将div中li元素中的字体颜色设置为红色。 <h3>语法结构三: </h3>将DOM元素、DOM元素数组转换成jQuery对象。 <div class="codetitle"><span><a style="CURSOR: pointer" data="31566" class="copybut" id="copybut31566" onclick="doCopy('code31566')"><U></U></a> <a href="/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code31566">jQuery(element|elementArray)</div></p> <p>参数列表: <table class="t_table jbborder" cellspacing="0" style="border-bottom: rgb(227,255); text-indent: 0px; width: 659px; border-collapse: collapse; font: small/19px Tahoma,Simsun; word-wrap: break-word; white-space: normal; empty-cells: show; table-layout: auto; letter-spacing: normal; height: 85px; color: rgb(68,245) 1px solid; padding-top: 4px"><font size="2" style="word-wrap: break-word">element</font></td> <td width="500" style="border-bottom: rgb(227,245) 1px solid; padding-top: 4px"><font size="2" style="word-wrap: break-word">要转换成jQuery对象的DOM元素。</font></td> </tr> <tr style="background-color: rgb(247,245) 1px solid; padding-top: 4px"><font size="2" style="word-wrap: break-word">elementArray</font></td> <td width="500" style="border-bottom: rgb(227,245) 1px solid; padding-top: 4px"><font size="2" style="word-wrap: break-word">要转换成jQuery对象的DOM元素数组。</font></td> </tr> </tbody> </table> </p> <p>实例<a href="/tag/daima/" target="_blank" class="keywords">代码</a>: 实例一:</p> <p><div class="codetitle"><span><a style="CURSOR: pointer" data="51456" class="copybut" id="copybut51456" onclick="doCopy('code51456')"><U></U></a> <a href="/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code51456"> <!DOCTYPE HTML> <html> <head> <<a href="/tag/Meta/" target="_blank" class="keywords">Meta</a> charset="utf-8"/> <meta name="author" content="//www.jb51.cc/" /> <title>jquery()<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a>-编程之家@H_<a href="/tag/301/" target="_blank" class="keywords">301</a>_24@ <script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("button").click(function(){ $(document.getElementById("first")).css("color","red"); }) }) </script> </head> <body> <div> <ul> <li id="first">DIV+CSS专区</li> <li>jQuery专区</li> <li>HTML专区</li> </ul> </div> <ul> <li>ASP专区</li> <li>编程之家<span>欢迎您</span></li> </ul> <p>太阳出来了</p> <button>点击查看<a href="/tag/xiaoguo/" target="_blank" class="keywords">效果</a></button> </body> </html> </div></p> <p>以上<a href="/tag/daima/" target="_blank" class="keywords">代码</a>可以将id为first的li元素中的字体颜色设置为红色。 实例二:</p> <p><div class="codetitle"><span><a style="CURSOR: pointer" data="18344" class="copybut" id="copybut18344" onclick="doCopy('code18344')"><U></U></a> <a href="/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code18344"> <!DOCTYPE HTML> <html> <head> <<a href="/tag/Meta/" target="_blank" class="keywords">Meta</a> charset="utf-8"/> <meta name="author" content="//www.jb51.cc/" /> <title>jQuery()<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a>-编程之家@H_<a href="/tag/301/" target="_blank" class="keywords">301</a>_24@ <script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("button").click(function(){ $(document.getElementsByTagName("li")).css("color","red"); }) }) </script> </head> <body> <div> <ul> <li id="first">DIV+CSS专区</li> <li>jQuery专区</li> <li>HTML专区</li> </ul> </div> <ul> <li>ASP专区</li> <li>编程之家<span>欢迎您</span></li> </ul> <p>太阳出来了</p> <button>点击查看<a href="/tag/xiaoguo/" target="_blank" class="keywords">效果</a></button> </body> </html> </div></p> <p><h3>语法结构四: </h3><div class="codetitle"><span><a style="CURSOR: pointer" data="17681" class="copybut" id="copybut17681" onclick="doCopy('code17681')"><U></U></a> <a href="/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code17681">jQuery(callback)</div> jQuery(callback)是$(document).ready()的缩写形式,在上面的几个实例中都有使用。 它的作用是当文档加载完成以后再去执行callback<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a> 参数列表: <table class="t_table jbborder" cellspacing="0" style="border-bottom: rgb(227,255); text-indent: 0px; width: 657px; border-collapse: collapse; font: 14px/21px Tahoma,Simsun; word-wrap: break-word; white-space: normal; empty-cells: show; table-layout: auto; letter-spacing: normal; height: 61px; color: rgb(68,245) 1px solid; padding-top: 4px"><font size="2" style="word-wrap: break-word">callback</font></td> <td width="500" style="border-bottom: rgb(227,245) 1px solid; padding-top: 4px"><font size="2" style="word-wrap: break-word">文档加载完成之后要执行的<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a>。</font></td> </tr> </tbody> </table> </p> <p>实例<a href="/tag/daima/" target="_blank" class="keywords">代码</a>:</p> <p><div class="codetitle"><span><a style="CURSOR: pointer" data="93114" class="copybut" id="copybut93114" onclick="doCopy('code93114')"><U></U></a> <a href="/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code93114"> <!DOCTYPE HTML> <html> <head> <<a href="/tag/Meta/" target="_blank" class="keywords">Meta</a> charset="utf-8"/> <meta name="author" content="//www.jb51.cc/" /> <title>jQuery()<a href="/tag/hanshu/" target="_blank" class="keywords">函数</a>-编程之家@H_<a href="/tag/301/" target="_blank" class="keywords">301</a>_24@ <script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script> <script type="text/javascript"> jQuery(function(){ alert("文档加载完成了"); }) </script> </head> <body> </body> </html> </div></p> <p><div class="codetitle"><span><a style="CURSOR: pointer" data="66815" class="copybut" id="copybut66815" onclick="doCopy('code66815')"><U></U></a> <a href="/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code66815">jQuery(function(){ alert("文档加载完成了"); })</div></p> <p>与下面<a href="/tag/daima/" target="_blank" class="keywords">代码</a><a href="/tag/gongneng/" target="_blank" class="keywords">功能</a>是相同的: <div class="codetitle"><span><a style="CURSOR: pointer" data="19153" class="copybut" id="copybut19153" onclick="doCopy('code19153')"><U></U></a> <a href="/tag/daima/" target="_blank" class="keywords">代码</a>如下:</div><div class="codebody" id="code19153">$(document).ready(function(){ alert("文档加载完成了"); })</div></p> <p>希望本文所述对大家的jQuery程序设计有所帮助。</p></div> <div class="topcard-tags"><a href="/tag/jQuery/" class="tag_link" target="_blank">jQuery</a><a href="/tag/jQuery/" class="tag_link" target="_blank">jQuery()</a><a href="/tag/fangfa/" class="tag_link" target="_blank">方法</a><a href="/tag/fangfap/" class="tag_link" target="_blank">方法</a><a href="/tag/pfangfa/" class="tag_link" target="_blank">方法</a><a href="/tag/yongfa/" class="tag_link" target="_blank">用法</a><a href="/tag/yongfap/" class="tag_link" target="_blank">用法</a></div> <ul class="list-group"> <li class="list-group-item"><a href="/jquery/56676.html" title="基于jquery实现发送文章到手机的代码">上一篇:基于jquery实现发送文章到手机的代</a><a href="/jquery/56673.html" title="jQuery.holdReady()方法用法实例" class="text-muted pull-right">下一篇:jQuery.holdReady()方法用法实例</a> </li> </ul> </div> </div> </div> <!-- row end --> <div class="row row-sm"> <div class="col-sm-12 col-md-12 col-lg-12"> <div class="card"> <ins class="adsbygoogle" style="display:block" data-ad-format="autorelaxed" data-ad-client="ca-pub-4605373693034661" data-ad-slot="9144498553"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); 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