Javascript Form - 如何验证表单提交值

我们想知道如何验证表单提交值。

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<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
window.onload=function(){
    var idImp = document.getElementById("id_importeur");
    document.getElementById('button').onclick = function(){
        listUsers(document.getElementById('input').value);
    };
    function listUsers(profil) {
        switch (profil.toUpperCase()) {
            case "DGA":
                idImp.innerHTML = "DGA";
                break;
            case "INDUSTRIEL":
                idImp.innerHTML = "INDUS";
                break;
            default:
                idImp.innerHTML = "Error";
                break;
        }
    }
}
</script>
</head>
<body>
  <div id="id_importeur">Result</div>
  <input type="text" id="input" />
  <input id="button" type="button" value="Submit" />
</body>
</html>
 
 
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Javascript Form - 如何验证表单提交值
