转自:http://my.oschina.net/jsonavaj/blog/62630
空格:$('parent childchild')表示获取parent下的所有的childchild节点(所有的子孙)。
大于号:$('parent > child')表示获取parent下的所有child的儿子( 第一代)。
加号:$('pre + nextbrother')表示获得pre节点的下一个兄弟节点,相当于next()方法
波浪号:$('pre ~ brother')表示获取pre节点的后面的所有兄弟节点,相当于nextAll()方法。
下面是一个小例子,看看他们的区别吧~~~~ (注意:代码测试效果不对,有时间再试试)
- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <head>
- <title>New Document </title>
- <meta name="Generator" content="EditPlus">
- <meta name="Author" content="">
- <meta name="Keywords" content="">
- <meta name="Description" content="">
- <script src='f:/study/jquery.js'></script>
- <script>
- $(function () {
- $("#b").append($("#a span").clone());
- $("#c").append($("#span12 + span").clone());
- $("#d").append($("#span12 ~ span").clone());
- $("#e").append($("#a > span").clone());
- })
- </script>
- </head>
- <body>
- <div id='a'>
- <span>span1</span>
- <div>
- <span>span1.1</span>
- <span id='span12'>span1.2</span>
- <span>span1.3</span>
- <span>span1.4</span>
- <span>span1.5</span>
- <span>span1.6</span>
- </div>
- <span>span2</span>
- <div>
- <span>span2.1</span>
- <span>span2.2</span>
- <span>span2.3</span>
- <span>span2.4</span>
- <span>span2.5</span>
- <span>span2.6</span>
- </div>
- <span>span3</span>
- <span>span4</span>
- </div>
- <hr>
- <div id='b'></div>
- 空格:
- <hr>
- <div id='c'></div>
- +:
- <hr>
- <div id='d'></div>
- ~:
- <hr>
- <div id='e'>
- >
- </div>
- </body>
- </html>