移动端解决fixed和input获取焦点软键盘弹出影响定位的问题
$("#area").bind('focus',function(){
var winHeight = $(window).height();
$(window).resize(function(){
var thisHeight = $(this).height();
if(winHeight - thisHeight > 50 ){
$('.submit-btn').hide();
}else{
$('.submit-btn').show();
}
})
})