Hover Event JS 3 RUN
 
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<!DOCTYPE html>
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<html>
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    <head>
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        <title>Click</title>
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        <meta charset="UTF-8">
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        <meta name="viewport" content="width=device-width, initial-scale=1.0">
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    </head>
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    <body>
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        <input type="button" id="hvbtn" value="Click me"/>
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        <script>
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            var obj = document.getElementById('hvbtn');
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            hvbtn.addEventListener('mouseover', function(){
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                alert('Bạn đã hover chuột qua thẻ input');
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            });
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        </script>
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    </body>
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</html>
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