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<!DOCTYPE html>
<html lang="pt-BR">
    <head>
        <title>Modelo BT4</title>
        <meta charset="UTF-8" />
        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous" />

    </head>
    <body>
        <p>Olá, pessoas!</p>
        <ul id="lista"> </ul>
        <button onclick="insereItem()">Insere Item</button>
        <button onclick="deletaItem()">Deleta Item</button>
        <button onclick="editarItem()">Editar Item</button>
        <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
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        <script src="ex.js"> </script>

        <ul id="lista"> </ul>


    </body>
</html>