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Index ([subject]) method, return value: Number (count from 0)
The index () method returns the index position of the specified Element relative to other specified elements. NOTE: If no element is found, index () returns-1.
Copy codeThe Code is as follows:
<Html>
<Head>
<Script type = "text/javascript" src = "http://lib.sinaapp.com/js/jquery/1.4.2/jquery.min.js"> </script>
<Script type = "text/javascript">
$ (Document). ready (function (){
$ ("Button"). click (function (){
Alert ($ (". hot"). index ($ ("# favorite ")));
});
});
</Script>
</Head>
<Body>
Click the following button to obtain the index of the element id = "favorite" relative to the jQuery selector (class = "hot:
<Button> retrieve index </button>
<Ul>
<Li> Milk </li>
<Li class = "hot"> Tea </li>
<Li class = "hot" id = "favorite"> Coffee </li>
</Ul>
</Body>
</Html>
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