<html lang="en"> <head> <meta charset="utf-8"> <title>选项卡默认值</title> <style> </style> <script src="http://lib.sinaapp.com/js/jquery/1.9.1/jquery-1.9.1.min.js"></script> </head> <body> <select name="sel" id="selectstation"> <option value="1" id='first_options'>苹果</option> <option value="2">西瓜</option> <option value="3">无花果</option> <option value="4">艾叶果</option> <option value="5">清果</option> </select> <h2>兄弟选择器 ~ </h2> <input type="button" id="brother" value='兄弟选择器' /> <h2>就近选择器 + </h2> <input type="button" id="next" value='就近选择器' /> <h2>子代选择器 > </h2> <input type="button" id="child" value='子代选择器' /> </body> <script> $("#brother").click(function(){ var second = $('#first_options ~ option').val(); alert(second); }); $('#next').click(function(){ var three = $('#first_options + option').val(); alert(three); }); $('#child').click(function(){ str = ''; $('#selectstation option').each(function(i){ str += $('#selectstation option:eq('+i+')').text()+','; }); alert(str); }); </script> </html>