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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script src="http://cdn.static.w3big.com/libs/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("button").click(function(){ alert($(".hot").index($("#favorite"))); }); }); </script> </head> <body> <p>单击按钮来获得id =“favorite”的元素的索引,相对于jQuery选择器(类=“hot”):</p> <button>获取下标</button> <ul> <li>Milk</li> <li class="hot">Tea</li> <li class="hot" id="favorite">Coffee</li> </ul> </body> </html>