Jquery过滤器的基本使用案例

HTML正文：

<input type="button" id="b1" value="偶数行红色"><br><input type="button" id="b2" value="奇数行绿色"><br><table border=1 width="100px"><tr><td>1</td><td>1</td><td>1</td><td>1</td></tr><tr><td>2</td><td>2</td><td>2</td><td>2</td></tr><tr><td>3</td><td>3</td><td>3</td><td>3</td></tr><tr><td>4</td><td>4</td><td>4</td><td>4</td></tr><tr><td>5</td><td>5</td><td>5</td><td>5</td></tr></table><br><input type="button" id="b3" value="奇数列红色"><br><input type="button" id="b4" value="偶数列绿色"><br><table border=1 width="100px"><tr><td>1</td><td>1</td><td>1</td><td>1</td></tr><tr><td>2</td><td>2</td><td>2</td><td>2</td></tr><tr><td>3</td><td>3</td><td>3</td><td>3</td></tr><tr><td>4</td><td>4</td><td>4</td><td>4</td></tr><tr><td>5</td><td>5</td><td>5</td><td>5</td></tr></table><br><input type="button" id="b5" value="奇数元素绿色"><br><table border=1 width="100px"><tr><td>1</td><td>1</td><td>1</td><td>1</td><td>1</td></tr><tr><td>2</td><td>2</td><td>2</td><td>2</td><td>2</td></tr><tr><td>3</td><td>3</td><td>3</td><td>3</td><td>3</td></tr><tr><td>4</td><td>4</td><td>4</td><td>4</td><td>4</td></tr><tr><td>5</td><td>5</td><td>5</td><td>5</td><td>5</td></tr></table>

Javascript操作代码：

$('#b1').click(function(){/*table:eq(0) tr:even  table:eq(0):筛选出第一张表格 tr:even:筛选出tr属性的对象*注意table和tr对象中间有空格，表示从属关系*/$('table:eq(0) tr:even').css("background","red");  });$('#b2').click(function(){$('table:eq(0) tr:odd').css("background","green");});$('#b3').click(function(){$('table:eq(1) td:even').css("background","red");});$('#b4').click(function(){$('table:eq(1) td:odd').css("background","green");});$('#b5').click(function(){$('table:eq(2) td:even').css("background","green");});

效果：