<![CDATA[<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3C菜鸟教程(w3cdata.com)</title>
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("input").focus(function(){
$("span").css("display","inline").fadeOut(2000);
});
});
</script>
<style>
span
{
display:none;
}
</style>
</head>
<body>
<input>
<span>请输入你的电话号码?</span>
<p>点击输入框获取焦点。</p>
</body>
</html>]]>