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                        /JavaScript入門篇

為什么嗎點(diǎn)擊按鈕沒反應(yīng),哪里錯(cuò)了嗎

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>display</title>
??? <script type="text/javascript">
??????? function hidetext()?
??{?
??var mychar = document.getElementById("con");
??????? mychar.style.display=none;
??}?
??function showtext()?
??{?
??var mychar = document.getElementById("con");
??????? mychar.style.display=block;
??}
??? </script>
</head>
<body>?
??? <h1>JavaScript</h1>?
??? <p id="con">做為一個(gè)Web開發(fā)師來說，如果你想提供漂亮的網(wǎng)頁、令用戶滿意的上網(wǎng)體驗(yàn)，JavaScript是必不可少的工具。</p>
??? <form>
?????? <input type="button" onclick="hidetext()" value="隱藏內(nèi)容" />
?????? <input type="button" onclick="showtext()" value="顯示內(nèi)容" />
??? </form>
</body>
</html>