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<!DOCTYPE html>
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<html>
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<head>
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    <title>Array indexOf() Example</title>
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</head>
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<body>
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    <script>
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        var numbers = [1,2,3,4,5,4,3,2,1];
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        alert(numbers.indexOf(4));        //3
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        alert(numbers.lastIndexOf(4));    //5
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        alert(numbers.indexOf(4, 4));     //5
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        alert(numbers.lastIndexOf(4, 4)); //3      
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​
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        var person = { name: "Nicholas" };
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        var people = [{ name: "Nicholas" }];
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        var morePeople = [person];
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        alert(people.indexOf(person));     //-1
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        alert(morePeople.indexOf(person)); //0
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​
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    </script>
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</body>
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</html>
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