乞丐版登录 

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<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<table>
		<tr>
			<td><span>用户名:</span></td><td><input type="text" name="username" id="username" value=""></td>
		</tr>
		<tr>
			<td><span>密&nbsp;码:</span></td><td><input type="password" name="password" id="password" value=""></td>
		</tr>
		<tr>
			<td><input type="button" value="登录" onclick="clickBtn()"></td>
			<td><input type="reset" value="重置" onclick="clickRst()"></td>
		</tr>
	</table>
</body>
<script>
	function clickBtn(){
		alert("helloworld");
	}
	function clickRst(){
		document.getElementById("username").value = "";
		document.getElementById("password").value = "";
	}
</script>
</html>