解决jsp底部footer一直处于界面底端的问题（自适应，随着屏幕滚动）

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window.onload = function(){
	//解决footer处于顶部问题
	var minBg = document.getElementsByClassName("minBg")[0];//minBg为footer上方的div容器
	if(minBg != undefined){
		var divHeight = document.getElementsByClassName("minBg")[0].offsetHeight;
		//footer是底部class
		var footerHeight = document.getElementsByClassName("footer")[0].offsetHeight;
		var brw = document.documentElement.clientHeight;
		if(divHeight <= (brw-footerHeight)){
			//加class
			setTimeout(addFooterFixed(), 300);
			//$(".footer").addClass("footerFixed");
		} else {
			//去掉class
			setTimeout(removeFooterFixed(), 300);
			//$(".footer").removeClass("footerFixed");
		}
	}
};
function addFooterFixed(){
	$(".footer").addClass("footerFixed");
}
function removeFooterFixed(){
	$(".footer").removeClass("footerFixed");
}

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.footerFixed{
	position:fixed;
	bottom:0;
	width:100%;
}