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本文实现的效果是根据浏览器分辨率的不同，页面底端背景色自适应浏览器高度，也就是可以自动填充背景色。
<script type="text/javascript">
function height_adaptive(){
var main=$(document).height();
var title=document.getElementById("login_title").scrollHeight;
var body=document.getElementById("login_body").scrollHeight;
var bottom=main-title-body;
$("#login_bottom").height(bottom);
}
</script>
<BODY id="userlogin_body" onload="height_adaptive()">
<form method="post" action="login.action" name="frm" id="frm">
<div id="login_title" class="login_title">
<span id="lbl_title">mindray | OR Digital System</span>
</div>
<div id="login_body" align="center" class="login_body">
<div align="left" class="login_head">
<img id="logo" alt="" src="./images/web/login_logo.png">
</div>
<table cellspacing="10px" style="padding-top:278px">
<tr>
<td><input type="text" id="userNameTest" name="tuser.username" onblur="showpasssword()" style="background:#FFFFFF url(images/web/user_available.png) no-repeat;" /></td>
</tr>
<tr>
<td><input type="password" id="usrpwdTest" name="tuser.password" style="background:#FFFFFF url(images/web/pwd_available.png) no-repeat;" /></td>
</tr>
<tr>
<td align="left"><img id="remember" alt="" src="images/web/ck_unselect.png" onmouseover="rem_mouseover()" onmouseout="rem_mouseout()"
onmousedown="rem_mousedown()" onmouseup="rem_mouseup()">
<span id="lbl_remember"> Remember me</span></td>
</tr>
</table>
</div>
<div id="login_bottom" align="center" class="login_bottom">
<br />
<button type="button" id="btn_login" onclick="check()" onmousedown="login_mousedown()" onmouseup="login_mouseup()">Log in</button>
</div>
</FORM>
</BODY>
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原文地址：http://blog.csdn.net/adgjlxxx/article/details/46725695
