<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>搜索框占位符文本</title>
<style type="text/css">
*{font-size:12px;}
#switcher input{height:26px;width:200px;}
.overlabel{position:raletive;}
.overlabel label{position:absolute;top:16px;left:16px;}
</style>
<script src="./jquery.js"></script>
<script type="text/javascript">
$(function(){
var $search=$("#search").addClass("overlabel");//虽然是给变量赋值，但是已经执行了，同时，其实执行完毕还是它本身
var $searchInput=$search.find("input");
var $searchLabel=$search.find("label");
if($searchInput.val()){
$searchLabel.hide();
}
$searchInput.focus(function(){
$searchLabel.hide();
})
.blur(function(){
if($searchInput.val()==''){
$searchLabel.show();
}
});
$searchLabel.click(function(){
$searchInput.trigger("focus");
});
});
</script>
</head>
<body>
<div id="switcher">
<form id="search" method="" action="" >
<label>字段的占位符文本</label>
<input type="text" value="" id="txt" maxlength="150" name="txtname" />
</div>
</body>
</html>
