<!DOCTYPE html> <html> <meta charset="UTF-8"> <head> <title>使用each()方法遍历元素</title> <script src="http://libs.baidu.com/jquery/1.9.0/jquery.js" type="text/javascript"></script> </head> <style> .red { background-color: Red; } </style> <body> <h3>使用each()方法遍历元素</h3> <span class="green">香蕉</span> <span class="green">桃子</span> <span class="green">葡萄</span> <span class="green">荔枝</span> <script type="text/javascript"> var ar = []; $("span").each(function (index) { ar.push($(this).text()); if (index == 1) { $(this).attr("class", "red"); } }); alert(ar.length); </script> </body> </html>
桃子变成了红色,数组长度为4