<div align="center"data-role="page" data-title="礼物" id="second" data-theme="a" data-add-back-btn="true">
<div data-role="header">
<div>
<h3>礼物</h3> <div align="right"> 欢迎！ <input type="button" value="注销" data-inline="true" onclick="logout();"></div>
<div align="left"><span id="showname">aaa</span> 你好<br />
</div></div></div>
把三个元素放同一行