js delay form submission

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>test</title>
</head>
<body>
    <form id="uo" action="https://www.baidu.com/">
        <input type="button" onclick="aoao();" value="跳转">
    </form>
    <script type="text/javascript">
    var uo=document.getElementById('uo');
    function aoao(){
        setTimeout("mooy()",3000);
    }
        function mooy(){
           uo.submit();
        }
    </script>
</body>
</html>

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