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複製代碼 代碼如下:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>JavaScript</title>
<style type="text/css">
body { /* 對頁面配置進行調整 */
background-color: #ccc;
width: 960px;
height: 50%;
margin: 0px auto;
}
</style>
</head>
<body>
<script type="text/javascript" src="jquery-1.8.0.js">
</script>
使用者名稱：<input type="text" name="user" id="user"/><br/>
密 碼：<input type="password" name="passwd" id="passwd"></input>
<script type="text/javascript">
$("body")
.css("margin-left",(($(document).width() - 1024) / 2) + "px")
.css("overflow-x", "hidden");
/* 只對id為passwd的控制項綁定keypress事件 */
$("input[id='passwd']").bind("keypress", function(event){
if (event.keyCode == '13') { // 斷行符號按鍵的代碼
if (!$('#user').val() || !$('#passwd').val()) { // 檢測使用者名稱與密碼是否為空白
alert("使用者名稱或密碼為空白，請重新輸入！");
return;
}
alert("使用者名稱為:" + $('#user').val() + ", 密碼為:" + $('#passwd').val());
}
});
</script>
</body>
</html>
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