標籤：
元素的 index，相對於選取器獲得元素相對於選取器的 index 位置。
該元素可以通過 DOM 元素或 jQuery 選取器來指定。
文法$(selector).index(element)
$(".hot").index($("#favorite")) #favorite相對於指定於其他.hot的位置
<meta charset="utf-8">
<title>菜鳥教程(runoob.com)</title>
<script src="http://cdn.static.runoob.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>單擊按鈕來獲得id =“favorite”的元素的索引,相對於jQuery選取器(類=“hot”):</p>
<button>擷取下標</button>
<ul>
<li>Milk</li>
<li class="hot">Tea</li>
<li class="hot">Tea</li>
<li >Tea</li>
<li class="hot" id="favorite">Coffee</li>
</ul>
</body>
</html>
jQuery DOM 元素方法 - index() 方法
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