<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="//www.VeVB.COm/" />
<title>val()函数-武林网</title>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("button").click(function(){
alert($("input").val());
})
})
</script>
</head>
<body>
<div>
<ul>
<li>
<input type="text" value="请输入用户名" />
</li>
</ul>
</div>
<button>点击查看效果</button>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="//www.VeVB.COm/" />
<title>val()函数-武林网</title>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("button").click(function(){
$("input").val("这是测试脚本");
})
})
</script>
</head>
<body>
<div>
<ul>
<li>
<input type="text" value="请输入用户名" />
</li>
</ul>
</div>
<button>点击查看效果</button>
</body>
</html>
