话不多说，请看代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>footer定位</title>
<style>
*{
margin:0;
padding: 0;
}
.box{
width: 100%;
height:300px;
background: pink;
margin-bottom: 30px;
}
.footer{
background: red;
width: 100%;
height:30px;
}
</style>
</head>
<body>
<div class="main">
<!--头部开始-->
<div class="box">
</div>
</div>
<!--底部-->
<div class="footer">
</div>
<script type="text/javascript" src='http://libs.baidu.com/jquery/2.0.0/jquery.js'></script>
</body>
</html>
<script>
$(document).ready(function () {
var theWindow = $(window);
function resized() {
var windowSize=window.devicePixelRatio;
if(windowSize==1){
var hg2 = $(window).height();
var main = $('.main').outerHeight();
var hg4 = $('.footer').outerHeight();
var hg=hg2-hg4
if( hg > main){
$('.footer').css({"position":'fixed','bottom':0,'left':0,"z-index":999,"width":"100%"});
}else{
$('.footer').css({"position":'static'});
}
}else{
$('.footer').css({"position":'static'});
}
}
theWindow.resize(function () {
resized();
}).trigger('resize');
});
</script>
以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持！