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用JQuery+CSS實現form表單的顯示和隱藏

<form id="f" method="post">
登陸<span id="x">X</span><br>
username:<input type="text" name="username"><br>
password:<input type="password" name="pwd"><br>
<button type="button" id="btn">確定</button>
</form>
<button type="button" id="view">顯示</button>