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jquery入门教程2011

jquery入门教程2011

ID：33585049

大小：1.73 MB

页数：34页

时间：2019-02-27

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1、jQuery入门[1]－构造函数jQuery优点◦体积小（v1.2.315kb）◦丰富的DOM选择器(CSS1-3+XPath)◦跨浏览器（IE6,FF,Safari,Opera）◦链式代码◦强大的事件、样式支持◦强大的AJAX功能◦易于扩展，插件丰富jQuery的构造函数接收四种类型的参数：jQuery(expression,context)jQuery(html)jQuery(elements)jQuery(fn)第一种根据表达式（ID，DOM元素名，CSS表达式，XPath表达式）找出文档中的元素，并组装成一个jQuery对象返回。DEMO:DOCTYPEhtmlPUBLIC"-//W

2、3C//DTDXHTML1.0Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">jQuerybasictitle><styletype="text/css">.selected{background-color:Yellow;}style><scriptsrc="../scripts/jquery-1.2.3.intellisense.js"type="text/javascript"</p><p>3、>script>head><body><h3>jQuery构造函数h3><ul><li>jQuery(expression,context)li><li>jQuery(html)li><li>jQuery(elements)li><li>jQuery(fn)li>ul><scripttype="text/javascript">script>body>html>将以下jQuery代码加入文末的脚本块中：jQuery("ul>li:first").addClass("selected");页面运行效果如下：其中jQuery()可替换为快捷方式$()，如果$被其它对象占用，可使用jQuery.n</p><p>4、oConflict()函数取消快捷方式。"ul>li:first"中ul>li表示所有位于ul下的li元素（为CSS表达式，XPath方式可用ul/li），:first表示其中的第一个。addClass()为jQuery对象用来添加CSS样式类的函数，相反的函数为removeClass()。再加入以下代码：$('ul').append($('newitem'));运行效果如下：其中$('newitem')将其中的字符串转换为DOM对象，然后通过append()函数加入ul对象的最后。接下来：$(document).ready(function(){$('ul').css('color','r</p><p>5、ed');});则效果如：jQuery构造函数中还可以真接传入DOM对象，如document，或jQuery对象（当然就没什么意义）。ready()函数为document添加事件处理函数，将ul的颜色设为红色。$(document).ready()由于应用场景众多，所以可以直接用$(fn)来代替，fn表示处理函数。（ready处理函数貌似在文档内容载入完成后执行，无需等待相关其它图片等资源载入完成，所以比load事件要更早执行，对于这点，没有具体证实）$(function(){alert('welcometojQuery');});以上代码的效果是页面一载入，就弹出一个对话框。jQuery1</p><p>6、.2选择器jQuery1.2选择器以下的文档根据官网1.2选择器汉化，并做相应的调整及加入了部份示例。由于实际使用中选择器在IE和非IE下会有不同的效果，请参照红色的字样。如有错误请及时联系我。绯雨汉化：http://feiyu.asgard.cn基本选择器#myid返回:对象>匹配一个id为myid的元素。element返回:对象>数组匹配所有的element元素.myclass返回:对象>数组匹配所有class为myclass的元素*返回:对象>数组匹配所有元素。该选择器会选择文档中所有的元素，包括html，head，bodyselector1,selector2,selectorN返回</p><p>7、:对象>数组匹配所有满足selector1或selector2或selectorN的元素层次选择elementParentelementChild返回:对象>数组匹配elementParent下的所有子元素elementChild。例如：$("divp")选择所有div下的p元素elementParent>elementChild返回:对象>数组匹配elementParent下的子元素elementChild</p> 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