1，我的JS库用到的
<script type="text/javascript">
window.onload=function(){
var height = Math.max(document.documentElement.clientHeight, document.body.offsetHeight);
document.getElementById('mainDiv').style.height=height+'px';
}
</script>
2，欢迎界面用到的
<script>
window.onload=function(){
var High=document.documentElement.offsetHeight||document.body.offsetHeight;
document.getElementById('content_bg').style.height=High-82+'px';
document.getElementById('welcomeimg').style.height=High-82+'px';
var aImg=document.getElementById('aImg');
aImg.style.marginTop=(High-82-aImg.offsetHeight)/2+'px';
};
</script>
</head>
<body>
<div class="content_bg" id="content_bg">
<div class="welcomeimg" id="welcomeimg"><img id="aImg" src="img/welcome.jpg" width="422" height="80" /></div>
</div>
</body>
上边的82是头部的一个固定高度得减去
3，jq
<script type="text/javascript">
$(function () {
var height = $(window).height();
// var topHeitht = $("#header").height();
// var topNavHeigh = $("#topNav").height();
// var titleHeitht = $("#dv_title").height();
// var footHeight = $("#footer").height();
var mainDiv = $("#mainDiv").height();
var contentHeight = height - (161);
$("#leftbox").height(contentHeight - 8);
if ($("#mainDiv").height() < contentHeight) {
$("#mainDiv").height(contentHeight - 8);
}
});
</script>
来自 http://blog.163.com/happy_zhangxiu/blog/static/116651126201362544734677/
