JQuery 中几个类选择器的简单使用介绍

复制代码代码如下: <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="TestClassSelector.aspx.cs" Inherits="WebApplication1.TestClassSelector" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <script src="Scripts/jquery-1.9.0.min.js"></script> <style type="text/css"> .first_div { background-color:red; } .second_div { background-color:green; } .first_span { width:500px; height:100px; } .eric_sun_class { font-family:Arial; font-size:18px; } </style> </head> <body> <form id="form1" runat="server"> <div> <div class="first_div"> This is the first div </div> <div class="second_div"> This is the second div </div> <div class="first_div"> <span class="first_span"> This is the first span </span> </div> <span class="first_span eric_sun_class"> This is the first span + eric sun class. </span> <br /> <span class="eric_sun_class"> This is the eric sun class. </span> <br /> <input type="button" value="Test" onclick="btn_Click();" /> </div> </form> </body> </html> <script type="text/javascript"> function btn_Click() { alert($(".first_div").text()); alert($(".first_div.first_span").text()); } </script> 复制代码代码如下: $(".first_div, .first_span") 将包含有.first_div 或者 .first_span" 的对象都取到。这里取到 4 个对象。此处的Html对应复制代码代码如下: <div class="first_div"> This is the first div </div> <div class="first_div"> <span class="first_span"> This is the first span </span> </div> <span class="first_span eric_sun_class"> This is the first span + eric sun class. </span> 复制代码代码如下: $(".first_div .first_span") 将以 .first_div 为类的控件下的以 .first_span 为类的对象取到（类与类之间带有空格逐层取）。这里只取到 1 个。对应的 className="first_span" 此处的Html对应复制代码代码如下: <div class="first_div"> <span class="first_span"> This is the first span </span> </div> 复制代码代码如下: $(".first_span.eric_sun_class") 将包含有.first_span 并且同时包含有 .eric_sun_class 类的对象取到（类与类之间没有空格类似于 ‘与' 操作）。这里只取到1个。对应的 className="first_span eric_sun_class" 此处的Html 对应复制代码代码如下: <span class="first_span eric_sun_class"> This is the first span + eric sun class. </span>

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